Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Derivatives (2)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	$ 18	$ 35
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	1	(6)	$ (9)
Total realized/unrealized gains (losses) included in AOCI	0	(3)	17
Purchases (5)	0	4
Sales (5)	0	0
Issuances (5)	0	0
Settlements (5)	(4)	0
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	(6)	(12)
Balance, end of period	9	18	35
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	1	(5)	(1)
Changes in unrealized gains (losses) included in OCI	0	(3)	17
Embedded Derivatives on Index-Linked Annuities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(8,186)	(3,932)
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	(3,951)	(4,097)	2,743
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases (5)	0	0
Sales (5)	0	0
Issuances (5)	0	0
Settlements (5)	644	(157)
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	0	0
Balance, end of period	(11,493)	(8,186)	(3,932)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(4,687)	(4,513)	2,485
Changes in unrealized gains (losses) included in OCI	0	0	0
Corporate (1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,320	1,787
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	(67)	(11)	(5)
Total realized/unrealized gains (losses) included in AOCI	2	28	(266)
Purchases (5)	323	162
Sales (5)	(239)	(116)
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	53	188
Transfers out of Level 3 (6)	(300)	(718)
Balance, end of period	1,092	1,320	1,787
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(59)	(11)	3
Changes in unrealized gains (losses) included in OCI	(33)	11	(268)
Structured Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	380	365
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	1	0	1
Total realized/unrealized gains (losses) included in AOCI	3	5	(23)
Purchases (5)	137	85
Sales (5)	(87)	(22)
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	0	3
Transfers out of Level 3 (6)	(69)	(56)
Balance, end of period	365	380	365
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 OCI	0	4	(23)
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	36	38
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	0	0	0
Total realized/unrealized gains (losses) included in AOCI	0	3	(10)
Purchases (5)	0	0
Sales (5)	0	(2)
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	(15)	(3)
Balance, end of period	21	36	38
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 OCI	0	3	(10)
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	25	27
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	(10)	(3)	0
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases (5)	0	2
Sales (5)	0	(1)
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	0	0
Balance, end of period	15	25	27
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	(2)	1
Changes in unrealized gains (losses) included in OCI	0	0	0
Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	0
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	0	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0	0
Purchases (5)	2	0
Sales (5)	0	0
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	0	0
Balance, end of period	2	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 OCI	$ 0	$ 0	$ 0