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Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | $ 858 | $ 836
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 2,996 | 1,781
Obligation to Return Securities Received as Collateral | 3,854 | 2,617
Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 446 | 415
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 1,599 | 527
Debt Security, Government, Non-US [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 21 | 20
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 121 | 79
US States and Political Subdivisions Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 6
Canadian and Canadian provincial governments |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 12 | 0
Asset-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 26 | 20
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 226 | 278
Commercial Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 37 | 46
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 278 | 233
Residential mortgage-backed securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 11 | 19
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 98 | 49
JAPAN |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 317 | 302
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 390 | 358
US Government Agencies Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 8
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 272 | 257
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] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | Asset-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | Commercial Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | Residential mortgage-backed securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | JAPAN |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity Overnight [Member] | US Government Agencies 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] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 163 | 302
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 217 | 0
Obligation to Return Securities Received as Collateral | 380 | 302
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 | 75
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 217 | 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] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity up to 30 days [Member] | Asset-backed 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] | Commercial Mortgage Backed 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] | Residential mortgage-backed securities |  |
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] | JAPAN |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 163 | 227
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity up to 30 days [Member] | US Government Agencies 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] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 300 | 83
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 105 | 297
Obligation to Return Securities Received as Collateral | 405 | 380
Maturity 30 to 90 Days [Member] | Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 218 | 7
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 88 | 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 | 11 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 17 | 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] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity 30 to 90 Days [Member] | Asset-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 23 | 17
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 27
Maturity 30 to 90 Days [Member] | Commercial Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 37 | 46
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 49
Maturity 30 to 90 Days [Member] | Residential mortgage-backed securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 11 | 13
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 7
Maturity 30 to 90 Days [Member] | JAPAN |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 214
Maturity 30 to 90 Days [Member] | US Government Agencies Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 0 | 0
Maturity over 90 days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 395 | 451
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 2,674 | 1,484
Obligation to Return Securities Received as Collateral | 3,069 | 1,935
Maturity over 90 days [Member] | Corporate Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 228 | 333
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 1,294 | 527
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 | 20
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 104 | 79
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 | 0 | 6
Maturity over 90 days [Member] | Canadian and Canadian provincial governments |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 12 | 0
Maturity over 90 days [Member] | Asset-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 3 | 3
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 226 | 251
Maturity over 90 days [Member] | Commercial Mortgage Backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 0
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 278 | 184
Maturity over 90 days [Member] | Residential mortgage-backed securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 6
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 98 | 42
Maturity over 90 days [Member] | JAPAN |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 154 | 75
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | 390 | 144
Maturity over 90 days [Member] | US Government Agencies Debt Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Fair Value of Collateral | 0 | 8
FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement | $ 272 | $ 257

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