| | 2020-12-31 | 2021-12-31 | 2022-12-31 | 2023-12-31 | 2024-12-31 | 2025-06-30 | 2025-09-30 |
| Amortization Cash Flow | | 245000000.0 | 238000000.0 | 239000000.0 | 230000000.0 | 220000000.0 | 220000000.0 |
| Amortization Of Intangibles | | 245000000.0 | 238000000.0 | 239000000.0 | 230000000.0 | 220000000.0 | 220000000.0 |
| Beginning Cash Position | | 3467000000.0 | 3631000000.0 | 3970000000.0 | 4047000000.0 | 2898000000.0 | 4067000000.0 |
| Capital Expenditure | | -811000000.0 | -734000000.0 | -816000000.0 | -926000000.0 | -1028000000.0 | -1037000000.0 |
| Cash Dividends Paid | | -866000000.0 | -972000000.0 | -970000000.0 | -1033000000.0 | -1076000000.0 | -1102000000.0 |
| Cash Flow From Continuing Financing Activities | | 9046000000.0 | -18431000000.0 | -13351000000.0 | 51791000000.0 | 44189000000.0 | 32239000000.0 |
| Cash Flow From Continuing Investing Activities | | -2172000000.0 | 6816000000.0 | 12738000000.0 | -39483000000.0 | -32300000000.0 | -25976000000.0 |
| Cash Flow From Continuing Operating Activities | | -6710000000.0 | 11954000000.0 | 690000000.0 | -13210000000.0 | -10767000000.0 | -5574000000.0 |
| Change In Accrued Expense | | -574000000.0 | 557000000.0 | -128000000.0 | 743000000.0 | 2562000000.0 | -592000000.0 |
| Change In Other Current Assets | | 691000000.0 | 421000000.0 | -1839000000.0 | 1672000000.0 | -1725000000.0 | -1193000000.0 |
| Change In Other Current Liabilities | -170000000.0 | -574000000.0 | 557000000.0 | -128000000.0 | | | |
| Change In Other Working Capital | | -11053000000.0 | 6804000000.0 | -223000000.0 | -19295000000.0 | -15048000000.0 | -7501000000.0 |
| Change In Payables And Accrued Expense | | -574000000.0 | 557000000.0 | -128000000.0 | 743000000.0 | 2562000000.0 | -592000000.0 |
| Change In Receivables | | -173000000.0 | -156000000.0 | -359000000.0 | -224000000.0 | -523000000.0 | -316000000.0 |
| Change In Working Capital | | -11109000000.0 | 7626000000.0 | -2549000000.0 | -17104000000.0 | -14734000000.0 | -9602000000.0 |
| Changes In Account Receivables | | -173000000.0 | -156000000.0 | -359000000.0 | -224000000.0 | -523000000.0 | -316000000.0 |
| Changes In Cash | | 164000000.0 | 339000000.0 | 77000000.0 | -902000000.0 | 1122000000.0 | 689000000.0 |
| Common Stock Dividend Paid | -889000000.0 | | | | | | |
| Common Stock Issuance | 0.0 | 1900000000.0 | 0.0 | 0.0 | | | |
| Common Stock Payments | | -939000000.0 | -1623000000.0 | -3876000000.0 | -1402000000.0 | -1499000000.0 | -1452000000.0 |
| Deferred Income Tax | | -162000000.0 | -62000000.0 | -184000000.0 | 145000000.0 | 64000000.0 | 25000000.0 |
| Deferred Tax | | -162000000.0 | -62000000.0 | -184000000.0 | 145000000.0 | 64000000.0 | 25000000.0 |
| Depreciation | | 1312000000.0 | 918000000.0 | 643000000.0 | 375000000.0 | 248000000.0 | 263000000.0 |
| Depreciation Amortization Depletion | | 1557000000.0 | 1156000000.0 | 882000000.0 | 605000000.0 | 468000000.0 | 483000000.0 |
| Depreciation And Amortization | | 1557000000.0 | 1156000000.0 | 882000000.0 | 605000000.0 | 468000000.0 | 483000000.0 |
| End Cash Position | | 3631000000.0 | 3970000000.0 | 4047000000.0 | 3145000000.0 | 4020000000.0 | 4756000000.0 |
| Financing Cash Flow | | 9046000000.0 | -18431000000.0 | -13351000000.0 | 51791000000.0 | 44189000000.0 | 32239000000.0 |
| Free Cash Flow | | -7521000000.0 | 11220000000.0 | -126000000.0 | -14136000000.0 | -11795000000.0 | -6611000000.0 |
| Gain Loss On Investment Securities | | -57000000.0 | 2000000.0 | 294000000.0 | 79000000.0 | | -2000000.0 |
| Income Tax Paid Supplemental Data | | 559000000.0 | 436000000.0 | 423000000.0 | 451000000.0 | 572000000.0 | 557000000.0 |
| Interest Paid Supplemental Data | | 37000000.0 | 1354000000.0 | 6184000000.0 | 8951000000.0 | 9232000000.0 | 9144000000.0 |
| Investing Cash Flow | | -2172000000.0 | 6816000000.0 | 12738000000.0 | -39483000000.0 | -32300000000.0 | -25976000000.0 |
| Issuance Of Capital Stock | | 1900000000.0 | 0.0 | 0.0 | 2323000000.0 | 1585000000.0 | 743000000.0 |
| Issuance Of Debt | | 1343000000.0 | 5700000000.0 | 7784000000.0 | 12703000000.0 | 16435000000.0 | 15439000000.0 |
| Long Term Debt Issuance | | 1343000000.0 | 3731000000.0 | 6221000000.0 | 6523000000.0 | 10255000000.0 | 9259000000.0 |
| Long Term Debt Payments | | -1443000000.0 | -1567000000.0 | -2545000000.0 | -2046000000.0 | -4347000000.0 | -5650000000.0 |
| Net Business Purchase And Sale | | -333000000.0 | 0.0 | -61000000.0 | -194000000.0 | 0.0 | 0.0 |
| Net Common Stock Issuance | | 961000000.0 | -1623000000.0 | -3876000000.0 | -1402000000.0 | -1499000000.0 | -1452000000.0 |
| Net Income From Continuing Operations | | 2693000000.0 | 2774000000.0 | 1944000000.0 | 2687000000.0 | 2850000000.0 | 2981000000.0 |
| Net Investment Purchase And Sale | | -7358000000.0 | 4818000000.0 | 5287000000.0 | -5629000000.0 | -3049000000.0 | -3668000000.0 |
| Net Issuance Payments Of Debt | | -3959000000.0 | 4133000000.0 | 5239000000.0 | 10657000000.0 | 2181000000.0 | 3416000000.0 |
| Net Long Term Debt Issuance | | -100000000.0 | 2164000000.0 | 3676000000.0 | 4477000000.0 | 5908000000.0 | 3609000000.0 |
| Net Other Financing Charges | | | | 57000000.0 | -20000000.0 | -18000000.0 | -17000000.0 |
| Net Other Investing Changes | | 241000000.0 | 51000000.0 | 117000000.0 | -332000000.0 | -102000000.0 | 16000000.0 |
| Net PPEPurchase And Sale | | -811000000.0 | -734000000.0 | -816000000.0 | -926000000.0 | -1028000000.0 | -1037000000.0 |
| Net Preferred Stock Issuance | | -500000000.0 | 0.0 | 0.0 | 823000000.0 | 1085000000.0 | 743000000.0 |
| Net Short Term Debt Issuance | | -3859000000.0 | 1969000000.0 | 1563000000.0 | 6180000000.0 | -3727000000.0 | -193000000.0 |
| Operating Cash Flow | | -6710000000.0 | 11954000000.0 | 690000000.0 | -13210000000.0 | -10767000000.0 | -5574000000.0 |
| Operating Gains Losses | | -57000000.0 | 2000000.0 | 294000000.0 | 79000000.0 | | -2000000.0 |
| Other Non Cash Items | | 401000000.0 | 438000000.0 | 257000000.0 | 303000000.0 | 426000000.0 | 478000000.0 |
| Preferred Stock Issuance | 0.0 | | 0.0 | 0.0 | 2323000000.0 | 1585000000.0 | 743000000.0 |
| Preferred Stock Payments | | -500000000.0 | 0.0 | 0.0 | -1500000000.0 | -500000000.0 | 0.0 |
| Purchase Of Business | | -346000000.0 | 0.0 | -61000000.0 | -194000000.0 | 0.0 | 0.0 |
| Purchase Of Investment | | -62549000000.0 | -26843000000.0 | -24807000000.0 | -44449000000.0 | -54444000000.0 | -53971000000.0 |
| Purchase Of PPE | | -811000000.0 | -734000000.0 | -816000000.0 | -926000000.0 | -1028000000.0 | -1037000000.0 |
| Repayment Of Debt | | -5302000000.0 | -1567000000.0 | -2545000000.0 | -2046000000.0 | -4347000000.0 | -5650000000.0 |
| Repurchase Of Capital Stock | | -1439000000.0 | -1623000000.0 | -3876000000.0 | -2902000000.0 | -1999000000.0 | -1452000000.0 |
| Sale Of Business | 0.0 | 13000000.0 | 0.0 | 0.0 | | | |
| Sale Of Investment | | 55191000000.0 | 31661000000.0 | 30094000000.0 | 38820000000.0 | 51395000000.0 | 50303000000.0 |
| Short Term Debt Issuance | 3302000000.0 | | 1969000000.0 | 1563000000.0 | 6180000000.0 | | |
| Short Term Debt Payments | -154000000.0 | -3859000000.0 | 0.0 | 0.0 | | | |