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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)