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Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]    
Document Period End Date Jun. 30, 2021  
Securities Loaned, Fair Value of Collateral $ 103 $ 105
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 919 711
Obligation to Return Securities Received as Collateral 1,022 816
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 979 771
SecuredBorrowingsGrossDifferenceAmount 43 45
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 220 0
Obligation to Return Securities Received as Collateral 220 0
Maturity over 90 days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 699 711
Obligation to Return Securities Received as Collateral 802 816
Corporate Debt Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Fair Value of Collateral 103 105
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 411 417
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 103 105
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 411 417
Debt Security, Government, Non-US [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement 508 294
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 220 0
Debt Security, Government, Non-US [Member] | Maturity over 90 days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement $ 288 $ 294