Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
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	$ (15)	$ (39)	$ 325
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	(5)	(459)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at January 1,	(143)	(170)
Total realized/unrealized gains (losses) included in net income (loss)	(23)	(39)	238
Total realized/unrealized gains (losses) included in AOCI	(31)	(5)	(537)
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	213	199
Transfers into Level 3	0	0
Transfers out of Level 3	(11)	(128)
Balance at December 31,	5	(143)	(170)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(15)	(39)	325
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	(5)	(459)
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	86	(36)	121
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,	(93)	(17)
Total realized/unrealized gains (losses) included in net income (loss)	86	(36)	121
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(2)	(40)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance at December 31,	(9)	(93)	(17)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	86	(36)	121
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,	28,345	24,401
Total realized/unrealized gains (losses) included in net income (loss)	(143)	(35)	(7)
Total realized/unrealized gains (losses) included in AOCI	(1,177)	1,413	(6,221)
Purchases	5,587	4,896
Sales	(2,236)	(2,112)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	232	249
Transfers out of Level 3	(4,103)	(467)
Balance at December 31,	26,505	28,345	24,401
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(82)	(10)	(3)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(1,189)	1,371	(6,136)
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	(82)	(10)	(3)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(1,189)	1,371	(6,136)
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	51	103
Total realized/unrealized gains (losses) included in net income (loss)	(1)	2	(38)
Total realized/unrealized gains (losses) included in AOCI	(2)	(3)	(13)
Purchases	2	13
Sales	(1)	(12)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	4
Transfers out of Level 3	(8)	(56)
Balance at December 31,	41	51	103
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(1)	2	(38)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(2)	(3)	(13)
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)	2	(38)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(2)	(3)	(13)
Structured Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	4,551	4,269
Total realized/unrealized gains (losses) included in net income (loss)	34	(11)	29
Total realized/unrealized gains (losses) included in AOCI	246	33	(478)
Purchases	3,014	757
Sales	(2,080)	(707)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	3,163	322
Transfers out of Level 3	(289)	(112)
Balance at December 31,	8,639	4,551	4,269
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	40	10	27
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	209	14	(450)
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	10	27
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	209	14	(450)
Municipals
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	0	0
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	7	0
Transfers out of Level 3	0	0
Balance at December 31,	7	0	0
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
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	249	259
Total realized/unrealized gains (losses) included in net income (loss)	(32)	9	16
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	53	2
Sales	(34)	(21)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance at December 31,	236	249	259
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(48)	0	11
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	(48)	0	11
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,	1,103	787
Total realized/unrealized gains (losses) included in net income (loss)	131	138	(133)
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	141	205
Sales	(166)	(19)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	1
Transfers out of Level 3	(19)	(9)
Balance at December 31,	1,190	1,103	787
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	135	136	(131)
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	135	136	(131)
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,	27	57
Total realized/unrealized gains (losses) included in net income (loss)	0	0	0
Total realized/unrealized gains (losses) included in AOCI	(1)	1	0
Purchases	5	27
Sales	(26)	(48)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	(10)
Balance at December 31,	5	27	57
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,	975	926
Total realized/unrealized gains (losses) included in net income (loss)	14	22	57
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	72	27
Sales	(282)	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	231	0
Transfers out of Level 3	0	0
Balance at December 31,	1,010	975	926
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	13	23	56
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	13	23	56
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,	1,147	1,210
Total realized/unrealized gains (losses) included in net income (loss)	(51)	(60)	61
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases	134	167
Sales	(226)	(180)
Issuances	0	0
Settlements	0	1
Transfers into Level 3	0	13
Transfers out of Level 3	(14)	(4)
Balance at December 31,	990	1,147	1,210
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