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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Jun. 30, 2021  
Securities Loaned, Fair Value of Collateral $ 103 $ 105
Securities Received as Collateral 102 102
Securities for Reverse Repurchase Agreements 877 653
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 670 669
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash 207 0
Reported Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 318 118
Securities Loaned, Fair Value of Collateral 94 94
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 360 161
Securities for Reverse Repurchase Agreements $ 919 $ 711