Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Residential mortgage loans - FVO
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	$ 165	$ 188
Total realized/unrealized gains (losses) included in net income (loss)	(5)	9	$ 7
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	0	0
Sales	(11)	(13)
Issuances	0	0
Settlements	(22)	(19)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance at December 31,	127	165	188
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(10)	3	(14)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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	(10)	3	(14)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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	(361)	67	(129)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(128)	579
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at January 1,	594	(146)
Total realized/unrealized gains (losses) included in net income (loss)	(460)	279	(108)
Total realized/unrealized gains (losses) included in AOCI	(334)	761	157
Purchases	30	4
Sales	0	0
Issuances	(13)	(2)
Settlements	32	(296)
Transfers into Level 3	1	0
Transfers out of Level 3	(2)	(6)
Balance at December 31,	(152)	594	(146)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(361)	67	(129)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(128)	579
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	746	(124)	264
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	27	(33)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at January 1,	(1,141)	(742)
Total realized/unrealized gains (losses) included in net income (loss)	747	(110)	274
Total realized/unrealized gains (losses) included in AOCI	27	(34)	(2)
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(244)	(255)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance at December 31,	(611)	(1,141)	(742)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	746	(124)	264
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	27	(33)
Corporate fixed maturity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	24,101	14,229
Total realized/unrealized gains (losses) included in net income (loss)	(34)	(88)	(49)
Total realized/unrealized gains (losses) included in AOCI	(1,334)	1,774	893
Purchases	4,988	5,013
Sales	(1,543)	(1,107)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	179	4,985
Transfers out of Level 3	(922)	(705)
Balance at December 31,	25,435	24,101	14,229
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(5)	(48)	(50)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(1,293)	1,754
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	(5)	(48)	(50)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(1,293)	1,754
Corporate fixed maturity securities | Metropolitan Property And Casualty Insurance Company [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Transfers out of Level 3	137
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	117	117
Total realized/unrealized gains (losses) included in net income (loss)	0	(2)	0
Total realized/unrealized gains (losses) included in AOCI	(2)	(1)	(2)
Purchases	1	29
Sales	(8)	(8)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	12	6
Transfers out of Level 3	(29)	(24)
Balance at December 31,	91	117	117
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	(1)	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(2)	(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	(1)	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(2)	(1)
Structured Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	5,289	4,458
Total realized/unrealized gains (losses) included in net income (loss)	46	49	46
Total realized/unrealized gains (losses) included in AOCI	(26)	41	42
Purchases	1,824	1,975
Sales	(1,326)	(918)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	358	127
Transfers out of Level 3	(294)	(443)
Balance at December 31,	5,871	5,289	4,458
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	42	54	44
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(24)	47
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	42	54	44
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(24)	47
Structured Securities | Metropolitan Property And Casualty Insurance Company [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Transfers out of Level 3	29
Municipals
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	0	7
Total realized/unrealized gains (losses) included in net income (loss)	0	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	(7)
Balance at December 31,	0	0	7
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	150	430
Total realized/unrealized gains (losses) included in net income (loss)	27	12	47
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	12	11
Sales	(35)	(156)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(3)	(147)
Balance at December 31,	151	150	430
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	13	2	39
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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	13	2	39
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0
Unit-linked and FVO Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	701	625
Total realized/unrealized gains (losses) included in net income (loss)	101	67	48
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	42	47
Sales	(18)	(101)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	86	154
Transfers out of Level 3	(11)	(91)
Balance at December 31,	901	701	625
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	101	69	48
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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	101	69	48
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0
Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	43	32
Total realized/unrealized gains (losses) included in net income (loss)	1	(7)	0
Total realized/unrealized gains (losses) included in AOCI	(3)	4	(1)
Purchases	2	38
Sales	(37)	(17)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	9
Transfers out of Level 3	(3)	(16)
Balance at December 31,	3	43	32
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	(7)	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	4
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	(7)	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	4
Other Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	573	455
Total realized/unrealized gains (losses) included in net income (loss)	94	19	0
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	348	99
Sales	(92)	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(25)	0
Balance at December 31,	898	573	455
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	89	24	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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	89	24	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0
Separate Accounts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	1,079	980
Total realized/unrealized gains (losses) included in net income (loss)	29	(5)	7
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	1,056	270
Sales	(44)	(159)
Issuances	(2)	(4)
Settlements	6	1
Transfers into Level 3	10	1
Transfers out of Level 3	(3)	(5)
Balance at December 31,	2,131	1,079	980
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	$ 0	$ 0