v3.26.1
Fair Value Measurements - Changes in Level 3 Financial Assets and Financial Liabilities Carried at Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 1,146 $ 373 $ 896  
Beginning balance, including held for sale assets       $ 417
(Losses) gains included in Shareholders' net income (83) (4) 175 (14)
Gains (losses) included in Other comprehensive loss 2 3 (1) 10
Purchases, sales and settlements        
Purchases 35 25 50 27
Sales (29) (2) (35) (2)
Settlements 0 (49) (2) (80)
Total purchases, sales and settlements 6 (26) 13 (55)
Transfers into / (out of) Level 3        
Transfers into Level 3 14 31 40 49
Transfers out of Level 3 (33) (15) (71) (45)
Total transfers into / (out of) Level 3 (19) 16 (31) 4
Ending balance 1,052 362 1,052 362
Total (losses) gains included in Shareholders' net income attributable to instruments held at the reporting date (83) (4) 175 (17)
Change in unrealized gain or (loss) included in Other comprehensive loss for assets held at the end of the reporting period $ 2 $ 4 $ (1) $ 7
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Net investment income, Net investment (losses) gains  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]     Other Comprehensive Income (Loss), Available-For-Sale Securities And Derivatives Adjustment, Net Of Tax