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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Mar. 31, 2020  
Securities Loaned, Fair Value of Collateral $ 99 $ 104
Securities Received as Collateral 107 107
Securities for Reverse Repurchase Agreements 398 356
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 344 370
Reported Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 325 339
Securities Loaned, Fair Value of Collateral 98 98
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 334 369
Securities for Reverse Repurchase Agreements $ 408 $ 384