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Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | $ 84 | $ 102
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 715 | 736
Obligation to Return Securities Received as Collateral | 799 | 838
Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 71 | 94
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 361 | 366
Debt Security, Government, Non-US [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 10 | 5
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 354 | 370
US States and Political Subdivisions Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 3 | 3
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 up to 30 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 106 | 0
Obligation to Return Securities Received as Collateral | 106 | 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 | 106 | 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 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 over 90 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 84 | 102
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 609 | 736
Obligation to Return Securities Received as Collateral | 693 | 838
Maturity over 90 days [Member] | Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 71 | 94
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 361 | 366
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 | 10 | 5
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 248 | 370
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 | $ 3 | $ 3

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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a financial asset repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same financial asset at a date certain for a specified price. Includes repurchase-to-maturity transactions and liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 + Details
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