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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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X

- 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://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

Reference 2: 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

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- Definition

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+ References

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