Fair Value Measurement - Fair Value Level 3 Rollforward Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
FG VIEs’ Assets
Fair Value Level 3 Rollforward
Fair value at beginning of period	$ 287	$ 318	$ 296	$ 442
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	2	8	20	(79)
Other comprehensive income (loss)	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(18)	(12)	(45)	(67)
VIE consolidations				18
Transfers out of Level 3				0
Fair value at end of period	271	314	271	314
Change in unrealized gains/(losses) related to financial instruments held	2	8	21	(2)
Assets of Consolidated Investment Vehicles | Corporate securities
Fair Value Level 3 Rollforward
Fair value at beginning of period		60		47
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)		2		10
Other comprehensive income (loss)		0		0
Purchases		0		5
Sales		0		0
Settlements		0		0
VIE consolidations				0
Transfers out of Level 3				0
Fair value at end of period		62		62
Change in unrealized gains/(losses) related to financial instruments held		2		10
Assets of Consolidated Investment Vehicles | Equity securities
Fair Value Level 3 Rollforward
Fair value at beginning of period	1	53	2	17
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	0	6	4	9
Other comprehensive income (loss)	0	0	0	0
Purchases	33	5	55	55
Sales	0	(21)	(27)	(38)
Settlements	0	0	0	0
VIE consolidations				0
Transfers out of Level 3				0
Fair value at end of period	34	43	34	43
Change in unrealized gains/(losses) related to financial instruments held	0	5	2	8
Assets of Consolidated Investment Vehicles | Structured products
Fair Value Level 3 Rollforward
Fair value at beginning of period		6		0
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)		0		3
Other comprehensive income (loss)		0		0
Purchases		0		17
Sales		(6)		(20)
Settlements		0		0
VIE consolidations				0
Transfers out of Level 3				0
Fair value at end of period		0		0
Change in unrealized gains/(losses) related to financial instruments held		0		0
Other
Fair Value Level 3 Rollforward
Fair value at beginning of period	31	(78)	54	(55)
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	(4)	(10)	(28)	13
Other comprehensive income (loss)	0	0	1	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
VIE consolidations				0
Transfers out of Level 3				0
Fair value at end of period	27	68	27	68
Change in unrealized gains/(losses) related to financial instruments held	(3)	(10)	(28)	13
Change in unrealized gains/(losses) included in OCI related to financial instruments			1
With Recourse
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at start of period	(296)	(332)	(316)	(367)
Total Pretax Realized And Unrealized Gains (Losses) Recorded As Liabilities [Abstract]
Net income (loss)	0	(9)	1	(5)
Other comprehensive income (loss)	2	(4)	(1)	2
Issuances	0	0	0	0
Settlements	13	9	35	50
VIE consolidations				(16)
Fair value at end of period	(281)	(336)	(281)	(336)
Change in unrealized gains/(losses) included in earnings related to financial instruments	0	(7)	2	(3)
Change in unrealized gains/(losses) included in OCI related to financial instruments	2	(4)	(1)	2
Without Recourse
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at start of period	(24)	(20)	(17)	(102)
Total Pretax Realized And Unrealized Gains (Losses) Recorded As Liabilities [Abstract]
Net income (loss)	2	(1)	(6)	73
Other comprehensive income (loss)	0	0	0	0
Issuances	0	0	0	0
Settlements	2	2	3	13
VIE consolidations				(3)
Fair value at end of period	(20)	(19)	(20)	(19)
Change in unrealized gains/(losses) included in earnings related to financial instruments	2	(1)	(6)	(2)
Liabilities of CIVs
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at start of period	(2,385)	(806)	(1,227)	(481)
Total Pretax Realized And Unrealized Gains (Losses) Recorded As Liabilities [Abstract]
Net income (loss)	4	(24)	2	13
Other comprehensive income (loss)	0	0	0	0
Issuances	(989)	0	(2,147)	(362)
Settlements	374	0	376	0
VIE consolidations				0
Fair value at end of period	(2,996)	(830)	(2,996)	(830)
Change in unrealized gains/(losses) included in earnings related to financial instruments	1	(24)	5	13
Obligations of state and political subdivisions | Fixed-maturity securities
Fair Value Level 3 Rollforward
Fair value at beginning of period	110	97	101	107
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	1	2	4	4
Other comprehensive income (loss)	(1)	(5)	7	(16)
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	(1)	(2)	(2)
VIE consolidations				0
Transfers out of Level 3				0
Fair value at end of period	110	93	110	93
Change in unrealized gains/(losses) included in OCI related to financial instruments	(1)	(5)	7	(16)
Corporate securities | Fixed-maturity securities
Fair Value Level 3 Rollforward
Fair value at beginning of period		29	30	41
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)		1	2	(5)
Other comprehensive income (loss)		0	16	(6)
Purchases		0	0	0
Sales		0	(48)	0
Settlements		0	0	0
VIE consolidations				0
Transfers out of Level 3				0
Fair value at end of period	0	30	0	30
Change in unrealized gains/(losses) included in OCI related to financial instruments		0	0	(6)
RMBS | Fixed-maturity securities
Fair Value Level 3 Rollforward
Fair value at beginning of period	248	254	255	308
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	8	5	15	10
Other comprehensive income (loss)	(2)	9	7	(26)
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(16)	(11)	(39)	(35)
VIE consolidations				0
Transfers out of Level 3				0
Fair value at end of period	238	257	238	257
Change in unrealized gains/(losses) included in OCI related to financial instruments	(2)	9	6	(24)
Asset-backed securities | Fixed-maturity securities
Fair Value Level 3 Rollforward
Fair value at beginning of period	975	714	940	658
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	5	7	16	21
Other comprehensive income (loss)	3	26	9	(16)
Purchases	55	172	266	290
Sales	0	(19)	(76)	(42)
Settlements	(70)	(3)	(187)	(13)
VIE consolidations				0
Transfers out of Level 3				(1)
Fair value at end of period	968	897	968	897
Change in unrealized gains/(losses) included in OCI related to financial instruments	3	26	9	(17)
Credit Risk Contract
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value at start of period	(154)	(161)	(100)	(185)
Total pre-tax realized and unrealized gains (losses) recorded in:
Net income (loss)	21	(3)	(31)	20
Other comprehensive income (loss)	0	0	0	0
Issuances	0	0	0	0
Settlements	(1)	5	(3)	6
VIE consolidations				0
Fair value at end of period	(134)	(159)	(134)	(159)
Change in unrealized gains/(losses) included in earnings related to financial instruments	$ 1	$ 1	$ (54)	$ 28