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Consolidated Statements of Shareholders' Equity (Parentheticals) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2022
Dec. 31, 2021
Treasury shares held in trust (in shares) 1   1 1
Treasury shares held in trust $ 29   $ 29 $ 29
Common stock 17   18 17
Reduction to retained earnings as a result of new accounting standard adoption $ (69,701) $ (64,170) (71,769) (74,841)
Accounting Standards Update [Extensible List] Accounting Standards Update 2018-12 ASU 2016-13    
Retained Earnings        
Reduction to retained earnings as a result of new accounting standard adoption $ (49,640) $ (45,108) $ (56,398) $ (54,997)
Cumulative Effect, Period of Adoption, Adjustment        
Reduction to retained earnings as a result of new accounting standard adoption $ 766 [1] 3 [2]    
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings        
Reduction to retained earnings as a result of new accounting standard adoption [2]   3    
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | ASU 2016-13        
Reduction to retained earnings as a result of new accounting standard adoption   $ 3    
[1] Reflects the adoption of ASU 2018-12, Targeted Improvements to the Accounting for Long-Duration Contracts (Topic 944) during the year ended December 31, 2021. See Note 8 ‘‘Other Insurance Liabilities and Separate Accounts’’ for additional information.
[2] Reflects the adoption of Accounting Standards Update (“ASU”) 2016-13, Financial Instruments - Credit Losses (Topic 326), which resulted in a reduction to retained earnings of $3 million during the year ended December 31, 2020.