Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Residential mortgage loans - FVO
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 140	$ 175	$ 165	$ 188
Total realized/unrealized gains (losses) included in net income (loss)	0	6	(3)	10
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	(11)	(7)
Issuances	0	0	0	0
Settlements	(6)	(5)	(17)	(15)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	134	176	134	176
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(1)	6	(7)	6
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(1)	6	(7)	6
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Net Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(273)	47	(392)	3
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	25	(28)	(206)	801
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	57	798	594	(146)
Total realized/unrealized gains (losses) included in net income (loss)	(279)	61	(490)	163
Total realized/unrealized gains (losses) included in AOCI	55	(24)	(365)	980
Purchases	7	0	14	0
Sales	0	0	0	0
Issuances	(1)	0	(6)	0
Settlements	(49)	(111)	43	(253)
Transfers into Level 3	0	0	1	0
Transfers out of Level 3	0	13	(1)	(7)
Balance, end of period	(210)	737	(210)	737
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(273)	47	(392)	3
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	25	(28)	(206)	801
Net Embedded Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	44	403	715	(653)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	1	(14)	22	(20)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(574)	(1,925)	(1,141)	(742)
Total realized/unrealized gains (losses) included in net income (loss)	47	408	716	(643)
Total realized/unrealized gains (losses) included in AOCI	0	(15)	22	(21)
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(60)	(66)	(184)	(192)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	(587)	(1,598)	(587)	(1,598)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	44	403	715	(653)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	1	(14)	22	(20)
Corporate fixed maturity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	23,773	20,732	24,101	14,229
Total realized/unrealized gains (losses) included in net income (loss)	(22)	(1)	(28)	(80)
Total realized/unrealized gains (losses) included in AOCI	(402)	673	(1,171)	371
Purchases	1,853	1,023	3,395	3,653
Sales	(475)	(529)	(951)	(911)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	242	622	139	5,416
Transfers out of Level 3	(233)	(377)	(749)	(535)
Balance, end of period	24,736	22,143	24,736	22,143
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(18)	(3)	(21)	(42)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(387)	665	(1,141)	350
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(18)	(3)	(21)	(42)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(387)	665	(1,141)	350
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	145	57	117	117
Total realized/unrealized gains (losses) included in net income (loss)	0	(1)	0	(1)
Total realized/unrealized gains (losses) included in AOCI	0	6	(1)	(1)
Purchases	12	12	13	12
Sales	(10)	0	(7)	(7)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	10	44	13	3
Transfers out of Level 3	(51)	(9)	(29)	(14)
Balance, end of period	106	109	106	109
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	(3)	0	(2)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	3	(1)	2
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	(3)	0	(2)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	3	(1)	2
Structured Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	6,003	5,377	5,289	4,458
Total realized/unrealized gains (losses) included in net income (loss)	9	23	36	30
Total realized/unrealized gains (losses) included in AOCI	36	96	9	(18)
Purchases	334	550	1,333	2,067
Sales	(401)	(305)	(1,049)	(704)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	6	39	256	73
Transfers out of Level 3	(407)	(368)	(294)	(494)
Balance, end of period	5,580	5,412	5,580	5,412
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	9	13	33	36
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	36	95	11	(12)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	9	13	33	36
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	36	95	11	(12)
Municipals
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	0	0	7
Total realized/unrealized gains (losses) included in net income (loss)	0	0	0	0
Total realized/unrealized gains (losses) included in AOCI	0	1	0	1
Purchases	34	10	34	10
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	(7)
Balance, end of period	34	11	34	11
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	1	0	1
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	1	0	1
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	143	373	150	430
Total realized/unrealized gains (losses) included in net income (loss)	6	6	16	2
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases	8	0	10	9
Sales	(5)	(69)	(21)	(105)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(1)	(158)	(4)	(184)
Balance, end of period	151	152	151	152
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	6	3	11	1
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	6	3	11	1
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Unit-linked and FVO Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	849	589	701	625
Total realized/unrealized gains (losses) included in net income (loss)	(9)	35	53	8
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases	9	7	20	20
Sales	(8)	(13)	(16)	(99)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	86	153
Transfers out of Level 3	(8)	(2)	(11)	(91)
Balance, end of period	833	616	833	616
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(9)	35	53	10
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(9)	35	53	10
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	113	7	43	32
Total realized/unrealized gains (losses) included in net income (loss)	1	(2)	1	(6)
Total realized/unrealized gains (losses) included in AOCI	(2)	(2)	(2)	(1)
Purchases	2	1	55	2
Sales	(28)	(1)	(37)	(17)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	1	0	0	9
Transfers out of Level 3	(30)	0	(3)	(16)
Balance, end of period	57	3	57	3
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	(2)	0	(6)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	(1)	0	(1)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	(2)	0	(6)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	(1)	0	(1)
Other Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	781	491	573	455
Total realized/unrealized gains (losses) included in net income (loss)	45	(8)	70	(11)
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases	116	3	299	42
Sales	(72)	0	(72)	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(25)	0	(25)	0
Balance, end of period	845	486	845	486
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	40	(7)	66	(7)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	40	(7)	66	(7)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Separate Accounts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,249	1,056	1,079	980
Total realized/unrealized gains (losses) included in net income (loss)	12	(3)	14	(2)
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases	161	72	336	204
Sales	(18)	(25)	(43)	(95)
Issuances	0	(2)	(1)	(4)
Settlements	0	0	6	1
Transfers into Level 3	0	0	10	10
Transfers out of Level 3	(5)	(9)	(2)	(5)
Balance, end of period	1,399	1,089	1,399	1,089
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	$ 0	$ 0	$ 0	$ 0