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Investments (Repurchase Agreements and Securities Lending Transactions) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | $ 9,384 | $ 10,894
Total cash collateral for loaned securities | 4,673 | 3,499
Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 8,899 | 10,348
Total cash collateral for loaned securities | 4,673 | 3,499
Up to 30 Days |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 485 | 546
Total cash collateral for loaned securities | 0 | 0
30 days or greater |  |
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 | 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 | 8,936 | 10,094
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 | 8,451 | 9,548
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 | 485 | 546
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 | 87 | 108
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 | 87 | 108
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 | 240 | 426
Foreign government bonds | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 240 | 426
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 | 0
U.S. public corporate securities |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 3,294 | 2,360
U.S. public corporate securities | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 3,294 | 2,360
U.S. 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 | 0 | 0
Foreign public corporate securities |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 801 | 567
Foreign public corporate securities | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 801 | 567
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 | 0 | 0
Commercial mortgage-backed securities |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 131 | 463
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 | 131 | 463
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
Residential mortgage-backed securities |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total securities sold under agreements to repurchase | 317 | 337
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 | 317 | 337
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
Equity securities |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 251 | 38
Equity securities | Overnight & Continuous |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |
Total cash collateral for loaned securities | 251 | 38
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 -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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