Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Net Derivatives (2)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	$ 9	$ 18
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	0	(3)
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases (5)	0	2
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	(6)
Balance, end of period	9	11
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	(3)
Changes in unrealized gains (losses) included in OCI	0	0
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	(11,493)	(8,186)
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	1,177	(1,886)
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases (5)	0	0
Sales (5)	0	0
Issuances (5)	0	0
Settlements (5)	391	131
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	0	0
Balance, end of period	(9,925)	(9,941)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	950	(2,040)
Changes in unrealized gains (losses) included in OCI	0	0
Corporate (1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,092	1,320
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	(8)	(5)
Total realized/unrealized gains (losses) included in AOCI	8	(8)
Purchases (5)	43	37
Sales (5)	(27)	(28)
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	4	15
Transfers out of Level 3 (6)	(446)	(64)
Balance, end of period	666	1,267
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	24	(3)
Changes in unrealized gains (losses) included in OCI	(19)	(19)
Structured Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	365	380
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	0	0
Total realized/unrealized gains (losses) included in AOCI	(1)	0
Purchases (5)	69	147
Sales (5)	(32)	(5)
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	(61)	(40)
Balance, end of period	340	482
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 OCI	(2)	(2)
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	21	36
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	0	0
Total realized/unrealized gains (losses) included in AOCI	1	0
Purchases (5)	0	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	(15)
Balance, end of period	22	21
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 OCI	1	0
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	15	25
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	(1)	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases (5)	0	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	14	25
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(1)	0
Changes in unrealized gains (losses) included in OCI	0	0
Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	2	0
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases (5)	0	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
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 OCI	$ 0	$ 0