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Investments (Repurchase Agreements and Securities Lending Transactions) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | $ 6,056 | $ 6,589
Total cash collateral for loaned securities | 6,477 | 6,100
Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 5,938 | 6,189
Total cash collateral for loaned securities | 5,981 | 5,622
Up to 30 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 118 | 200
Total cash collateral for loaned securities | 496 | 478
30 to 90 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 0 | 200
Total cash collateral for loaned securities | 0 | 0
U.S. Treasury securities and obligations of U.S. government authorities and agencies |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 5,693 | 6,579
Total cash collateral for loaned securities | 1 | 1
U.S. Treasury securities and obligations of U.S. government authorities and agencies | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 5,693 | 6,179
Total cash collateral for loaned securities | 1 | 1
U.S. Treasury securities and obligations of U.S. government authorities and agencies | Up to 30 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 0 | 200
Total cash collateral for loaned securities | 0 | 0
U.S. Treasury securities and obligations of U.S. government authorities and agencies | 30 to 90 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 0 | 200
Obligations of U.S. states and their political subdivisions |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 67 | 61
Obligations of U.S. states and their political subdivisions | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 67 | 61
Obligations of U.S. states and their political subdivisions | Up to 30 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 0 | 0
Foreign government bonds |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 242 | 299
Foreign government bonds | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 242 | 285
Foreign government bonds | Up to 30 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 0 | 14
U.S. public corporate securities |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 118 | 0
Total cash collateral for loaned securities | 4,819 | 4,504
U.S. public corporate securities | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 0 | 0
Total cash collateral for loaned securities | 4,399 | 4,109
U.S. public corporate securities | Up to 30 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 118 | 0
Total cash collateral for loaned securities | 420 | 395
U.S. public corporate securities | 30 to 90 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 0 | 0
Foreign public corporate securities |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 725 | 875
Foreign public corporate securities | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 649 | 806
Foreign public corporate securities | Up to 30 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 76 | 69
Commercial mortgage-backed securities |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 245 | 0
Commercial mortgage-backed securities | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 245 | 0
Commercial mortgage-backed securities | Up to 30 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 0 | 0
Commercial mortgage-backed securities | 30 to 90 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 0 | 0
Residential mortgage-backed securities |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 0 | 10
Residential mortgage-backed securities | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 0 | 10
Residential mortgage-backed securities | Up to 30 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 0 | 0
Residential mortgage-backed securities | 30 to 90 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 0 | 0
Equity securities |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 623 | 360
Equity securities | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 623 | 360
Equity securities | Up to 30 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | $ 0 | $ 0

X
- 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 -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-7 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a)(1) -SubTopic 30 -Topic 860 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-7 + Details
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- Definition Amount, before effects of master netting arrangements, of financial assets loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and financial assets transferred other than securities that qualify as secured borrowings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-7 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a)(1) -SubTopic 30 -Topic 860 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481420/860-30-50-7 + Details
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