Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 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	$ 17	$ 13	$ (14)	$ 31
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(9)	(48)	(21)	7
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(139)	53	(143)	(170)
Total realized/unrealized gains (losses) included in net income (loss)	17	32	(16)	38
Total realized/unrealized gains (losses) included in AOCI	(15)	(41)	(40)	46
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	135	(1)
Settlements	67	(3)	0	33
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(5)	(255)	(11)	(160)
Balance, end of period	(75)	(214)	(75)	(214)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	17	13	(14)	31
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(9)	(48)	(21)	7
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	8	(17)	40	(35)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(62)	(44)	(93)	(17)
Total realized/unrealized gains (losses) included in net income (loss)	8	(18)	40	(35)
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(1)	(2)	(2)	(12)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	(55)	(64)	(55)	(64)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	8	(17)	40	(35)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Corporate fixed maturity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	28,503	25,676	28,345	24,401
Total realized/unrealized gains (losses) included in net income (loss)	(46)	(8)	(52)	(17)
Total realized/unrealized gains (losses) included in AOCI	(294)	(369)	(678)	343
Purchases	1,940	1,122	3,078	2,408
Sales	(794)	(527)	(1,406)	(1,064)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	72	210	109	391
Transfers out of Level 3	(141)	(136)	(156)	(494)
Balance, end of period	29,240	25,968	29,240	25,968
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(9)	(8)	(3)	(20)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(314)	(379)	(686)	321
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	(9)	(8)	(3)	(20)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(314)	(379)	(686)	321
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	45	46	51	103
Total realized/unrealized gains (losses) included in net income (loss)	0	(1)	2	(1)
Total realized/unrealized gains (losses) included in AOCI	(4)	3	(5)	2
Purchases	0	5	0	13
Sales	(1)	(4)	(3)	(12)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	11	0	10
Transfers out of Level 3	0	0	(5)	(55)
Balance, end of period	40	60	40	60
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	(1)	2	(1)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(4)	3	(5)	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	0	(1)	2	(1)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(4)	3	(5)	2
Structured Products
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	5,277	4,553	4,551	4,269
Total realized/unrealized gains (losses) included in net income (loss)	12	2	15	(7)
Total realized/unrealized gains (losses) included in AOCI	(5)	(43)	40	(24)
Purchases	1,343	272	1,582	413
Sales	(168)	(112)	(340)	(239)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	86	71	165	212
Transfers out of Level 3	(678)	(189)	(146)	(70)
Balance, end of period	5,867	4,554	5,867	4,554
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	11	4	15	3
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(7)	(45)	35	(26)
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	11	4	15	3
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	(7)	(45)	35	(26)
Municipals
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	0	0	0
Total realized/unrealized gains (losses) included in net income (loss)	0	0	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases	2	7	2	7
Sales	(1)	0	(1)	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	1	7	1	7
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	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	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	253	258	249	259
Total realized/unrealized gains (losses) included in net income (loss)	(11)	(1)	(8)	6
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases	27	0	31	2
Sales	(7)	(7)	(10)	(17)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	262	250	262	250
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(10)	1	(3)	(3)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	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	(10)	1	(3)	(3)
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Unit-linked and FVO Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,093	1,011	1,103	787
Total realized/unrealized gains (losses) included in net income (loss)	36	50	67	95
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases	112	190	114	205
Sales	(139)	(193)	(165)	(26)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	1
Transfers out of Level 3	(6)	(1)	(23)	(5)
Balance, end of period	1,096	1,057	1,096	1,057
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	36	50	67	94
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	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	36	50	67	94
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	14	58	27	57
Total realized/unrealized gains (losses) included in net income (loss)	0	0	0	0
Total realized/unrealized gains (losses) included in AOCI	0	(1)	(1)	0
Purchases	6	5	10	17
Sales	(10)	(44)	(26)	(47)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	(9)
Balance, end of period	10	18	10	18
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	(1)	0	(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	0	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	(1)	0	(1)
Other Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,171	928	975	926
Total realized/unrealized gains (losses) included in net income (loss)	0	23	12	25
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases	42	13	47	13
Sales	(140)	0	(140)	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	179	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	1,073	964	1,073	964
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(5)	23	8	26
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	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	(5)	23	8	26
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	0	0	0
Separate Accounts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,142	1,202	1,147	1,210
Total realized/unrealized gains (losses) included in net income (loss)	(8)	(17)	(37)	(39)
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases	44	72	83	170
Sales	(56)	(21)	(67)	(110)
Issuances	0	0	0	0
Settlements	0	0	0	1
Transfers into Level 3	0	12	3	16
Transfers out of Level 3	0	0	(7)	0
Balance, end of period	1,122	1,248	1,122	1,248
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	0	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	0
Changes in unrealized gains (losses) included in AOCI for the instruments still held at end of period	$ 0	$ 0	$ 0	$ 0