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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Securities Received as Collateral $ 107 $ 112
Securities for Reverse Repurchase Agreements 356 554
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 370 531
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash 1 29
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 369 367
Securities Loaned, Fair Value of Collateral 104 103
Securities for Reverse Repurchase Agreements 384 554
Reported Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 339 336
Securities Loaned, Fair Value of Collateral $ 98 $ 102