Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
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	$ 16	$ (34)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	(20)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	5	(143)
Total realized/unrealized gains (losses) included in net income (loss)	17	(35)
Total realized/unrealized gains (losses) included in AOCI	1	(28)
Purchases	0	0
Sales	0	0
Issuances	0	(2)
Settlements	(1)	71
Transfers into Level 3	0	0
Transfers out of Level 3	(1)	(2)
Balance, end of period	21	(139)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	16	(34)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	(20)
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	(32)	32
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]
Balance, beginning of period	(9)	(93)
Total realized/unrealized gains (losses) included in net income (loss)	(32)	32
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(2)	(1)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	(43)	(62)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(32)	32
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0
Corporate fixed maturity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	26,505	28,345
Total realized/unrealized gains (losses) included in net income (loss)	(23)	(11)
Total realized/unrealized gains (losses) included in AOCI	423	(372)
Purchases	1,314	1,232
Sales	(448)	(536)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	116	87
Transfers out of Level 3	(375)	(242)
Balance, end of period	27,512	28,503
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(1)	7
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	393	(379)
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)	7
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	393	(379)
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	41	51
Total realized/unrealized gains (losses) included in net income (loss)	0	2
Total realized/unrealized gains (losses) included in AOCI	3	0
Purchases	15	1
Sales	(1)	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(1)	(9)
Balance, end of period	57	45
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	2
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	3	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	2
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	3	0
Structured Products
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	8,639	4,551
Total realized/unrealized gains (losses) included in net income (loss)	3	3
Total realized/unrealized gains (losses) included in AOCI	40	45
Purchases	1,949	906
Sales	(140)	(170)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	7	79
Transfers out of Level 3	(5,691)	(137)
Balance, end of period	4,807	5,277
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	3	3
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	40	42
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	3	3
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	40	42
Municipals
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	7	0
Total realized/unrealized gains (losses) included in net income (loss)	1	0
Total realized/unrealized gains (losses) included in AOCI	(1)	0
Purchases	2	0
Sales	(7)	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	2	0
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	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
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, beginning of period	236	249
Total realized/unrealized gains (losses) included in net income (loss)	15	2
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	20	5
Sales	(23)	(3)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	248	253
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(4)	5
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	(4)	5
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, beginning of period	1,190	1,103
Total realized/unrealized gains (losses) included in net income (loss)	(20)	31
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	106	129
Sales	(101)	(153)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	7
Transfers out of Level 3	0	(24)
Balance, end of period	1,175	1,093
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(14)	31
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	(14)	31
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, beginning of period	5	27
Total realized/unrealized gains (losses) included in net income (loss)	0	0
Total realized/unrealized gains (losses) included in AOCI	(2)	0
Purchases	10	4
Sales	(1)	(12)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(3)	(5)
Balance, end of period	9	14
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(3)	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
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(3)	1
Other Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,010	975
Total realized/unrealized gains (losses) included in net income (loss)	2	12
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	147	5
Sales	(38)	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	179
Transfers out of Level 3	0	0
Balance, end of period	1,121	1,171
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	13
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	13
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, beginning of period	990	1,147
Total realized/unrealized gains (losses) included in net income (loss)	5	(28)
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	42	39
Sales	(58)	(12)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	1	3
Transfers out of Level 3	(8)	(7)
Balance, end of period	972	1,142
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	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
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	$ 0	$ 0