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Other Comprehensive Income (Loss) - Components of accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | $ 20,820 | $ 18,353 |
Balance at end of year | 24,206 | 20,820 | $ 18,353
Accumulated other comprehensive income (loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (720) | (676) | (1,646)
Other comprehensive income (loss) before reclassifications | 745 | (125) | 570
Amounts reclassified from accumulated other comprehensive income | (20) | 81 | 400
Net current period other comprehensive income (loss) | 725 | (44) | 970
Balance at end of year | 5 | (720) | (676)
Unrealized Appreciation on Available-For-Sale Investments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (507) | (565) | (1,512)
Other comprehensive income (loss) before reclassifications | 661 | (23) | 547
Amounts reclassified from accumulated other comprehensive income | (20) | 81 | 400
Net current period other comprehensive income (loss) | 641 | 58 | 947
Balance at end of year | 134 | (507) | (565)
Foreign Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (213) | (111) | (134)
Other comprehensive income (loss) before reclassifications | 84 | (102) | 23
Amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0
Net current period other comprehensive income (loss) | 84 | (102) | 23
Balance at end of year | $ (129) | $ (213) | $ (111)

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