Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Net Derivatives (2)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	$ 36	$ 2
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	(10)	8
Total realized/unrealized gains (losses) included in AOCI	4	(1)
Purchases (7)	0	(2)
Sales (7)	0	0
Issuances (7)	0	0
Settlements (7)	0	0
Transfers into Level 3 (8)	0	0
Transfers out of Level 3 (8)	0	1
Balance, end of period	30	8
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(10)	8
Changes in unrealized gains (losses) included in OCI	4	(1)
Net Embedded Derivatives (3)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(8,614)	(7,301)
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	1,379	665
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases (7)	0	0
Sales (7)	0	0
Issuances (7)	0	0
Settlements (7)	75	(138)
Transfers into Level 3 (8)	0	0
Transfers out of Level 3 (8)	0	0
Balance, end of period	(7,160)	(6,774)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	1,517	663
Changes in unrealized gains (losses) included in OCI	0	0
Corporate (1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,399	684
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	0	(1)
Total realized/unrealized gains (losses) included in AOCI	(99)	(22)
Purchases (7)	422	118
Sales (7)	(93)	(4)
Issuances (7)	0	0
Settlements (7)	0	0
Transfers into Level 3 (8)	86	4
Transfers out of Level 3 (8)	(97)	(112)
Balance, end of period	1,618	667
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	(1)
Changes in unrealized gains (losses) included in OCI	(98)	(22)
Structured Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	220	67
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	0	0
Total realized/unrealized gains (losses) included in AOCI	(5)	0
Purchases (7)	87	80
Sales (7)	(2)	(3)
Issuances (7)	0	0
Settlements (7)	0	0
Transfers into Level 3 (8)	1	3
Transfers out of Level 3 (8)	(107)	(21)
Balance, end of period	194	126
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Changes in unrealized gains (losses) included in OCI	(5)	0
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	26	0
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	0	0
Total realized/unrealized gains (losses) included in AOCI	(3)	0
Purchases (7)	0	0
Sales (7)	0	0
Issuances (7)	0	0
Settlements (7)	0	0
Transfers into Level 3 (8)	0	0
Transfers out of Level 3 (8)	0	0
Balance, end of period	23	0
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Changes in unrealized gains (losses) included in OCI	(3)	0
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	13	3
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases (7)	0	0
Sales (7)	0	0
Issuances (7)	0	0
Settlements (7)	0	0
Transfers into Level 3 (8)	0	0
Transfers out of Level 3 (8)	0	0
Balance, end of period	13	3
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Changes in unrealized gains (losses) included in OCI	0	0
Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	2	0
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases (7)	0	0
Sales (7)	(2)	0
Issuances (7)	0	0
Settlements (7)	0	0
Transfers into Level 3 (8)	0	0
Transfers out of Level 3 (8)	0	0
Balance, end of period	0	0
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Changes in unrealized gains (losses) included in OCI	0	0
Separate Account Assets (4)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	3
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases (7)	0	0
Sales (7)	0	(1)
Issuances (7)	0	0
Settlements (7)	0	0
Transfers into Level 3 (8)	0	0
Transfers out of Level 3 (8)	0	0
Balance, end of period	0	2
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Changes in unrealized gains (losses) included in OCI	$ 0	$ 0

Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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