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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Securities Received as Collateral $ 102 $ 107
Securities for Reverse Repurchase Agreements 653 356
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 669 370
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash   1
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 161 369
Securities Loaned, Fair Value of Collateral 105 104
Securities for Reverse Repurchase Agreements 711 384
Carrying Value [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 118 339
Securities Loaned, Fair Value of Collateral $ 94 $ 98