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Derivative Financial Instruments - Carrying Amounts of Derivative Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Total asset derivatives $ 849 $ 575
Total liability derivatives 3,956 3,505
Accounts Payable and Accrued Liabilities    
Derivative [Line Items]    
Total liability derivatives 73 101
Call options | Derivative investments    
Derivative [Line Items]    
Total asset derivatives 816 548
Other embedded derivatives | Other long-term investments    
Derivative [Line Items]    
Total asset derivatives 33 27
FIA/ IUL embedded derivatives | Contractholder funds    
Derivative [Line Items]    
Total liability derivatives $ 3,883 $ 3,404