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Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]    
Document Period End Date Jun. 30, 2020  
Securities Loaned, Fair Value of Collateral $ 105 $ 104
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 481 384
Obligation to Return Securities Received as Collateral 586 488
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 533 478
SecuredBorrowingsGrossDifferenceAmount 53 10
Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 0 0
Obligation to Return Securities Received as Collateral 0 0
Maturity up to 30 days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 0 0
Obligation to Return Securities Received as Collateral 0 0
Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 0 0
Obligation to Return Securities Received as Collateral 0 0
Maturity over 90 days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 481 384
Obligation to Return Securities Received as Collateral 586 488
Corporate Debt Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Fair Value of Collateral 105 104
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 353 286
Corporate Debt Securities [Member] | Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Fair Value of Collateral 0 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 0 0
Corporate Debt Securities [Member] | Maturity up to 30 days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Fair Value of Collateral 0 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 0 0
Corporate Debt Securities [Member] | Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Fair Value of Collateral 0 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 0 0
Corporate Debt Securities [Member] | Maturity over 90 days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Fair Value of Collateral 105 104
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 353 286
Debt Security, Government, Non-US [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 128 98
Debt Security, Government, Non-US [Member] | Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 0 0
Debt Security, Government, Non-US [Member] | Maturity up to 30 days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 0 0
Debt Security, Government, Non-US [Member] | Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 0 0
Debt Security, Government, Non-US [Member] | Maturity over 90 days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement $ 128 $ 98