Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
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	$ (34)	$ 158
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(20)	64
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(143)	(170)
Total realized/unrealized gains (losses) included in net income (loss)	(35)	168
Total realized/unrealized gains (losses) included in AOCI	(28)	83
Purchases	0	0
Sales	0	0
Issuances	(2)	0
Settlements	71	33
Transfers into Level 3	0	(61)
Transfers out of Level 3	(2)	0
Balance, end of period	(139)	53
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	(17)
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	(93)	(17)
Total realized/unrealized gains (losses) included in net income (loss)	32	(17)
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(1)	(10)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	(62)	(44)
Corporate fixed maturity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	28,345	24,401
Total realized/unrealized gains (losses) included in net income (loss)	(11)	1
Total realized/unrealized gains (losses) included in AOCI	(372)	703
Purchases	1,232	1,547
Sales	(536)	(649)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	87	191
Transfers out of Level 3	(242)	(518)
Balance, end of period	28,503	25,676
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	7	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(379)	694
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	51	103
Total realized/unrealized gains (losses) included in net income (loss)	2	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	1	8
Sales	0	(9)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(9)	(56)
Balance, end of period	45	46
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	2	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	(1)
Structured Products
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	4,551	4,269
Total realized/unrealized gains (losses) included in net income (loss)	3	(7)
Total realized/unrealized gains (losses) included in AOCI	45	20
Purchases	906	341
Sales	(170)	(139)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	79	139
Transfers out of Level 3	(137)	(70)
Balance, end of period	5,277	4,553
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	42	18
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	249	259
Total realized/unrealized gains (losses) included in net income (loss)	2	7
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	5	2
Sales	(3)	(10)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	253	258
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	5	(3)
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	1,103	787
Total realized/unrealized gains (losses) included in net income (loss)	31	45
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	129	193
Sales	(153)	(13)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	7	2
Transfers out of Level 3	(24)	(3)
Balance, end of period	1,093	1,011
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	31	45
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	27	57
Total realized/unrealized gains (losses) included in net income (loss)	0	0
Total realized/unrealized gains (losses) included in AOCI	0	1
Purchases	4	52
Sales	(12)	(42)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(5)	(10)
Balance, end of period	14	58
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	1	0
Other Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	975	926
Total realized/unrealized gains (losses) included in net income (loss)	12	1
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	5	1
Sales	0	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	179	0
Transfers out of Level 3	0	0
Balance, end of period	1,171	928
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	13	3
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	1,147	1,210
Total realized/unrealized gains (losses) included in net income (loss)	(28)	(22)
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	39	101
Sales	(12)	(93)
Issuances	0	0
Settlements	0	1
Transfers into Level 3	3	5
Transfers out of Level 3	(7)	0
Balance, end of period	1,142	1,202
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