Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Residential mortgage loans - FVO
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	$ 0	$ 127
Total realized/unrealized gains (losses) included in net income (loss)	0	(8)	$ (5)
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	0	0
Sales	0	(108)
Issuances	0	0
Settlements	0	(11)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance at December 31,	0	0	127
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	(10)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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	(10)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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	(39)	325	(361)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(5)	(459)	(128)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at January 1,	(170)	(152)
Total realized/unrealized gains (losses) included in net income (loss)	(39)	238	(460)
Total realized/unrealized gains (losses) included in AOCI	(5)	(537)	(334)
Purchases	0	82
Sales	0	0
Issuances	0	(3)
Settlements	199	201
Transfers into Level 3	0	0
Transfers out of Level 3	(128)	1
Balance at December 31,	(143)	(170)	(152)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(39)	325	(361)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(5)	(459)	(128)
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	(36)	121	55
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at January 1,	(17)	(222)
Total realized/unrealized gains (losses) included in net income (loss)	(36)	121	55
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(40)	84
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance at December 31,	(93)	(17)	(222)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(36)	121	55
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0
Corporate fixed maturity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	24,401	25,435
Total realized/unrealized gains (losses) included in net income (loss)	(35)	(7)	(34)
Total realized/unrealized gains (losses) included in AOCI	1,413	(6,221)	(1,334)
Purchases	4,896	5,273
Sales	(2,112)	(1,762)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	249	2,127
Transfers out of Level 3	(467)	(444)
Balance at December 31,	28,345	24,401	25,435
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(10)	(3)	(5)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	1,371	(6,136)	(1,293)
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)	(5)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	1,371	(6,136)	(1,293)
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	103	91
Total realized/unrealized gains (losses) included in net income (loss)	2	(38)	0
Total realized/unrealized gains (losses) included in AOCI	(3)	(13)	(2)
Purchases	13	36
Sales	(12)	(9)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	4	46
Transfers out of Level 3	(56)	(10)
Balance at December 31,	51	103	91
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	2	(38)	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(3)	(13)	(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	2	(38)	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(3)	(13)	(2)
Structured Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	4,269	5,871
Total realized/unrealized gains (losses) included in net income (loss)	(11)	29	46
Total realized/unrealized gains (losses) included in AOCI	33	(478)	(26)
Purchases	757	967
Sales	(707)	(984)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	322	251
Transfers out of Level 3	(112)	(1,387)
Balance at December 31,	4,551	4,269	5,871
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	10	27	42
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	14	(450)	(24)
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	27	42
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	14	(450)	(24)
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	259	151
Total realized/unrealized gains (losses) included in net income (loss)	9	16	27
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	2	108
Sales	(21)	(14)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	(2)
Balance at December 31,	249	259	151
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	11	13
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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	11	13
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0
Unit-linked and FVO Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	787	901
Total realized/unrealized gains (losses) included in net income (loss)	138	(133)	101
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	205	28
Sales	(19)	(24)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	1	23
Transfers out of Level 3	(9)	(8)
Balance at December 31,	1,103	787	901
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	136	(131)	101
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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	136	(131)	101
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0
Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	57	3
Total realized/unrealized gains (losses) included in net income (loss)	0	0	1
Total realized/unrealized gains (losses) included in AOCI	1	0	(3)
Purchases	27	56
Sales	(48)	(2)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(10)	0
Balance at December 31,	27	57	3
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	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	0
Other Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	926	898
Total realized/unrealized gains (losses) included in net income (loss)	22	57	94
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	27	246
Sales	0	(177)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	(98)
Balance at December 31,	975	926	898
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	23	56	89
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	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	23	56	89
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0
Separate Accounts (9)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	1,210	2,131
Total realized/unrealized gains (losses) included in net income (loss)	(60)	61	29
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	167	202
Sales	(180)	(1,164)
Issuances	0	(2)
Settlements	1	4
Transfers into Level 3	13	1
Transfers out of Level 3	(4)	(23)
Balance at December 31,	1,147	1,210	2,131
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	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	$ 0