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Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Total asset derivatives $ 722 $ 575
Total liability derivatives 3,866 3,505
Call options | Derivative investments    
Derivative [Line Items]    
Total asset derivatives 690 548
Futures contracts | Derivative investments    
Derivative [Line Items]    
Total asset derivatives 1 0
Foreign currency forward | Derivative investments    
Derivative [Line Items]    
Total asset derivatives 1 0
Other embedded derivatives | Other long-term investments    
Derivative [Line Items]    
Total asset derivatives 30 27
FIA embedded derivative | Contractholder funds    
Derivative [Line Items]    
Total liability derivatives 3,759 3,404
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities | Accounts payable and accrued liabilities:    
Derivative [Line Items]    
Total liability derivatives $ 107 $ 101