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Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | $ 56 | $ 55
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 964 | 779
Obligation to Return Securities Received as Collateral | 1,020 | 834
Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 40 | 42
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 342 | 279
Debt Security, Government, Non-US [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 5 | 5
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 98 | 95
US States and Political Subdivisions Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 6 | 3
Canadian and Canadian provincial governments |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 5 | 5
Asset-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 57 | 54
Commercial Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 111 | 63
Residential mortgage-backed securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 53 | 10
JAPAN |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 290 | 278
US Government Agencies Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 13 | 0
Maturity Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Obligation to Return Securities Received as Collateral | 0 | 0
Maturity Overnight [Member] | Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | Debt Security, Government, Non-US [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
Maturity Overnight [Member] | Canadian and Canadian provincial governments |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
Maturity Overnight [Member] | Asset-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | Commercial Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | Residential mortgage-backed securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | JAPAN |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | US Government Agencies Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
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
Obligation to Return Securities Received as Collateral | 0 | 0
Maturity up to 30 days [Member] | Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity up to 30 days [Member] | Debt Security, Government, Non-US [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity up to 30 days [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
Maturity up to 30 days [Member] | Canadian and Canadian provincial governments |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
Maturity up to 30 days [Member] | Asset-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity up to 30 days [Member] | Commercial Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity up to 30 days [Member] | Residential mortgage-backed securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity up to 30 days [Member] | JAPAN |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity up to 30 days [Member] | US Government Agencies Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
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
Obligation to Return Securities Received as Collateral | 0 | 0
Maturity 30 to 90 Days [Member] | Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity 30 to 90 Days [Member] | Debt Security, Government, Non-US [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity 30 to 90 Days [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
Maturity 30 to 90 Days [Member] | Canadian and Canadian provincial governments |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
Maturity 30 to 90 Days [Member] | Asset-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity 30 to 90 Days [Member] | Commercial Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity 30 to 90 Days [Member] | Residential mortgage-backed securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity 30 to 90 Days [Member] | JAPAN |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity 30 to 90 Days [Member] | US Government Agencies Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity over 90 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 56 | 55
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 964 | 779
Obligation to Return Securities Received as Collateral | 1,020 | 834
Maturity over 90 days [Member] | Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 40 | 42
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 342 | 279
Maturity over 90 days [Member] | Debt Security, Government, Non-US [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 5 | 5
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 98 | 95
Maturity over 90 days [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 6 | 3
Maturity over 90 days [Member] | Canadian and Canadian provincial governments |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 5 | 5
Maturity over 90 days [Member] | Asset-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 57 | 54
Maturity over 90 days [Member] | Commercial Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 111 | 63
Maturity over 90 days [Member] | Residential mortgage-backed securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 53 | 10
Maturity over 90 days [Member] | JAPAN |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 290 | 278
Maturity over 90 days [Member] | US Government Agencies Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | $ 13 | $ 0

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