| | 2021-12-31 | 2022-12-31 | 2023-12-31 | 2024-12-31 | 2025-06-30 | 2025-12-31 |
| Amortization Of Securities | | -992000000.0 | -1332000000.0 | -1512000000.0 | | -1840000000.0 |
| Beginning Cash Position | | 20116000000.0 | 20195000000.0 | 20639000000.0 | 20786000000.0 | 20068000000.0 |
| Cash Dividends Paid | | -1783000000.0 | -1764000000.0 | -1727000000.0 | -1713000000.0 | -1703000000.0 |
| Cash Flow From Continuing Financing Activities | | -9948000000.0 | -2940000000.0 | -3131000000.0 | 4000000.0 | 163000000.0 |
| Cash Flow From Continuing Investing Activities | | -2620000000.0 | -10246000000.0 | -11493000000.0 | -13829000000.0 | -15607000000.0 |
| Cash Flow From Continuing Operating Activities | | 13044000000.0 | 13721000000.0 | 14598000000.0 | | 17092000000.0 |
| Change In Other Current Assets | | 1809000000.0 | -663000000.0 | -518000000.0 | | -1568000000.0 |
| Change In Other Current Liabilities | | 360000000.0 | 2115000000.0 | -580000000.0 | | 1917000000.0 |
| Change In Other Working Capital | | -3149000000.0 | -1835000000.0 | -1266000000.0 | | -859000000.0 |
| Change In Receivables | | 299000000.0 | -1952000000.0 | 460000000.0 | | -27000000.0 |
| Change In Working Capital | | 2099000000.0 | 1448000000.0 | 1366000000.0 | | 5380000000.0 |
| Changes In Account Receivables | | 299000000.0 | -1952000000.0 | 460000000.0 | | -27000000.0 |
| Changes In Cash | | 476000000.0 | 535000000.0 | -26000000.0 | 1404000000.0 | 1648000000.0 |
| Common Stock Dividend Paid | | -1598000000.0 | -1566000000.0 | -1527000000.0 | -1517000000.0 | -1509000000.0 |
| Common Stock Payments | | -3326000000.0 | -3103000000.0 | -3207000000.0 | -3101000000.0 | -2883000000.0 |
| Depreciation And Amortization | | 673000000.0 | 718000000.0 | 714000000.0 | | 753000000.0 |
| Earnings Losses From Equity Investments | | 505000000.0 | 1090000000.0 | 844000000.0 | | 365000000.0 |
| Effect Of Exchange Rate Changes | | -397000000.0 | -91000000.0 | -545000000.0 | -12000000.0 | 316000000.0 |
| End Cash Position | | 20195000000.0 | 20639000000.0 | 20068000000.0 | 22190000000.0 | 22032000000.0 |
| Financing Cash Flow | | -9948000000.0 | -2940000000.0 | -3131000000.0 | 4000000.0 | 163000000.0 |
| Free Cash Flow | | 13044000000.0 | 13721000000.0 | 14598000000.0 | 15229000000.0 | 17092000000.0 |
| Gain Loss On Investment Securities | | 1260000000.0 | 2800000000.0 | 1165000000.0 | | 1144000000.0 |
| Income Tax Paid Supplemental Data | | 1056000000.0 | 1833000000.0 | 1600000000.0 | 1536000000.0 | 1564000000.0 |
| Interest Paid Supplemental Data | | 905000000.0 | 989000000.0 | 1037000000.0 | 1017000000.0 | 1041000000.0 |
| Investing Cash Flow | | -2620000000.0 | -10246000000.0 | -11493000000.0 | -13829000000.0 | -15607000000.0 |
| Issuance Of Capital Stock | 0.0 | 0.0 | | | | |
| Issuance Of Debt | | 1013000000.0 | 2671000000.0 | 1853000000.0 | 2538000000.0 | 2182000000.0 |
| Long Term Debt Issuance | | 1013000000.0 | 2671000000.0 | 1853000000.0 | 2538000000.0 | 2182000000.0 |
| Long Term Debt Payments | | -85000000.0 | -1880000000.0 | -2674000000.0 | -1744000000.0 | -2624000000.0 |
| Net Business Purchase And Sale | | -709000000.0 | -755000000.0 | -358000000.0 | -556000000.0 | -1365000000.0 |
| Net Common Stock Issuance | | -3326000000.0 | -3103000000.0 | -3207000000.0 | -3101000000.0 | -2883000000.0 |
| Net Income From Continuing Operations | | 5302000000.0 | 1602000000.0 | 4444000000.0 | | 3403000000.0 |
| Net Investment Properties Purchase And Sale | | -112000000.0 | -914000000.0 | -280000000.0 | -186000000.0 | -128000000.0 |
| Net Investment Purchase And Sale | | 3784000000.0 | -8178000000.0 | -12201000000.0 | -15448000000.0 | -17906000000.0 |
| Net Issuance Payments Of Debt | | 928000000.0 | 791000000.0 | -821000000.0 | 794000000.0 | -442000000.0 |
| Net Long Term Debt Issuance | | 928000000.0 | 791000000.0 | -821000000.0 | 794000000.0 | -442000000.0 |
| Net Other Financing Charges | | 4963000000.0 | 4419000000.0 | 2868000000.0 | 4771000000.0 | 6216000000.0 |
| Net Other Investing Changes | | -63000000.0 | -143000000.0 | -173000000.0 | -120000000.0 | -75000000.0 |
| Net Preferred Stock Issuance | | 0.0 | 0.0 | 0.0 | | -1000000000.0 |
| Operating Cash Flow | | 13044000000.0 | 13721000000.0 | 14598000000.0 | 15229000000.0 | 17092000000.0 |
| Operating Gains Losses | | 1765000000.0 | 3890000000.0 | 2009000000.0 | | 1509000000.0 |
| Other Cash Adjustment Outside Changein Cash | -69000000.0 | 0.0 | | | | |
| Other Non Cash Items | | -3724000000.0 | -3834000000.0 | -3623000000.0 | | -3739000000.0 |
| Preferred Stock Dividend Paid | | -185000000.0 | -198000000.0 | -200000000.0 | -196000000.0 | -194000000.0 |
| Preferred Stock Issuance | 0.0 | 0.0 | | | | |
| Preferred Stock Payments | | 0.0 | 0.0 | 0.0 | | -1000000000.0 |
| Purchase Of Business | | -2914000000.0 | -1670000000.0 | -1441000000.0 | -1517000000.0 | -2390000000.0 |
| Purchase Of Investment | | -104644000000.0 | -84274000000.0 | -82138000000.0 | -86817000000.0 | -97107000000.0 |
| Purchase Of Investment Properties | | -1208000000.0 | -1057000000.0 | -1033000000.0 | -713000000.0 | -633000000.0 |
| Repayment Of Debt | | -85000000.0 | -1880000000.0 | -2674000000.0 | -1744000000.0 | -2624000000.0 |
| Repurchase Of Capital Stock | | -3326000000.0 | -3103000000.0 | -3207000000.0 | -3101000000.0 | -3883000000.0 |
| Sale Of Business | | 2205000000.0 | 915000000.0 | 1083000000.0 | 961000000.0 | 1025000000.0 |
| Sale Of Investment | | 108428000000.0 | 76096000000.0 | 69937000000.0 | 71369000000.0 | 79201000000.0 |
| Sale Of Investment Properties | | 1096000000.0 | 143000000.0 | 753000000.0 | 527000000.0 | 505000000.0 |