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Fair Value Measurements - Changes in Level 3 Financial Assets and Financial Liabilities Carried at Fair Value (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Transfers into/(out of) Level 3    
Change in unrealized gains or losses included in other comprehensive income for assets held at the end of the reporting period $ (6)  
Disposed of by Sale | U.S Group Disability and Life Insurance    
Transfers into/(out of) Level 3    
Debt securities included in business divestiture 7,800  
Disposed of by Sale | U.S Group Disability and Life Insurance | Significant Unobservable Inputs (Level 3)    
Transfers into/(out of) Level 3    
Debt securities included in business divestiture 108  
Debt and Equity Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance 555  
Balance 555 $ 410
Total gains (losses) included in shareholders’ net income (7) (8)
Gains (losses) included in other comprehensive income (12) 22
Gains (losses) required to adjust future policy benefits for settlement annuities 7 2
Purchases, sales and settlements    
Purchases 107 72
Sales (121) 0
Settlements (89) (19)
Total purchases, sales and settlements (103) 53
Transfers into/(out of) Level 3    
Transfers into Level 3 774 170
Transfers out of Level 3 (360) (94)
Total transfers into/(out of) Level 3 414 76
Balance 854 555
Balance   555
Total gains (losses) included in shareholders’ net income attributable to instruments held at the reporting date $ (17) $ (8)