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Derivative Instruments (Narrative) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2022
USD ($)
item
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Credit Derivatives [Line Items]      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 72    
Cash flow hedge, reclassified to earnings, net $ 0 $ 0  
Credit default swaps, number of instruments | item 2    
Collateral Requirement If Netting Agreements Not In Place $ 1    
Non-performance Risk Adjustment 0    
Exposure Associated With Collateralization Events $ 0   $ 0
Indexed Annuity [Member]      
Credit Derivatives [Line Items]      
Derivative term 6 years