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Fair Value Measurements - Changes in Level 3 Financial Assets and Financial Liabilities Carried at Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Transfers into/(out of) Level 3        
Change in unrealized gains or losses included in Other comprehensive income (loss) for assets held at the end of the reporting period $ (33) $ 2 $ (60) $ (8)
Debt and Equity Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance   854   854
Balance 512   796  
Gains (losses) included in Shareholders' net income 4 3 14 (8)
(Losses) gains included in Other comprehensive income (loss) (34) 2 (62) (7)
Gains (losses) required to adjust future policy benefits for settlement annuities 23 1 0 (6)
Purchases, sales and settlements        
Purchases 81 37 157 108
Sales 0 (36) 0 (36)
Settlements (54) (1) (206) (26)
Total purchases, sales and settlements 27 0 (49) 46
Transfers into/(out of) Level 3        
Transfers into Level 3 6 58 124 181
Transfers out of Level 3 (34) (19) (319) (161)
Total transfers into/(out of) Level 3 (28) 39 (195) 20
Balance 504 899 504 899
Total (losses) included in Shareholders' net income attributable to instruments held at the reporting date $ 0 $ (3) $ (2) $ (3)