Fair Value of Financial Instruments - Schedule of Liabilities Measured at Fair Value on Recurring Basis and Utilized Significant Unobservable (Level 3) Inputs to Determine Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 259	$ 241
Total realized and unrealized (gains) losses, Included in net (income)	(1)	(9)
Total realized and unrealized (gains) losses, Included in OCI	8	(23)
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(6)	(6)
Transfer into Level 3	0	0
Transfer out of Level 3	(1)	(1)
Ending balance	259	202
Total (gains) losses included in net (income) attributable to liabilities still held, Included in net (income)	(1)	(9)
Total (gains) losses included in OCI attributable to liabilities still held, Included in OCI	$ 8	$ (22)
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain (Loss) Statement Of Other Comprehensive Income Extensible List Not Disclosed Flag	Includedin OCI	Includedin OCI
Derivative liabilities:
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 107	$ 71
Total realized and unrealized (gains) losses, Included in net (income)	1	(4)
Total realized and unrealized (gains) losses, Included in OCI	8	(23)
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Transfer into Level 3	0	0
Transfer out of Level 3	0	0
Ending balance	116	44
Total (gains) losses included in net (income) attributable to liabilities still held, Included in net (income)	1	(4)
Total (gains) losses included in OCI attributable to liabilities still held, Included in OCI	8	(22)
Forward bond purchase commitments \| Derivative liabilities:
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	107	71
Total realized and unrealized (gains) losses, Included in net (income)	1	(4)
Total realized and unrealized (gains) losses, Included in OCI	8	(23)
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Transfer into Level 3	0	0
Transfer out of Level 3	0	0
Ending balance	116	44
Total (gains) losses included in net (income) attributable to liabilities still held, Included in net (income)	1	(4)
Total (gains) losses included in OCI attributable to liabilities still held, Included in OCI	8	(22)
Policyholder account balances:
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	152	170
Total realized and unrealized (gains) losses, Included in net (income)	(2)	(5)
Total realized and unrealized (gains) losses, Included in OCI	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(6)	(6)
Transfer into Level 3	0	0
Transfer out of Level 3	(1)	(1)
Ending balance	143	158
Total (gains) losses included in net (income) attributable to liabilities still held, Included in net (income)	(2)	(5)
Total (gains) losses included in OCI attributable to liabilities still held, Included in OCI	0	0
Policyholder account balances: \| Fixed indexed annuity embedded derivatives
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	138	155
Total realized and unrealized (gains) losses, Included in net (income)	(2)	(4)
Total realized and unrealized (gains) losses, Included in OCI	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(5)	(5)
Transfer into Level 3	0	0
Transfer out of Level 3	(1)	(1)
Ending balance	130	145
Total (gains) losses included in net (income) attributable to liabilities still held, Included in net (income)	(2)	(4)
Total (gains) losses included in OCI attributable to liabilities still held, Included in OCI	0	0
Policyholder account balances: \| Indexed universal life embedded derivatives
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	14	15
Total realized and unrealized (gains) losses, Included in net (income)	0	(1)
Total realized and unrealized (gains) losses, Included in OCI	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(1)	(1)
Transfer into Level 3	0	0
Transfer out of Level 3	0	0
Ending balance	13	13
Total (gains) losses included in net (income) attributable to liabilities still held, Included in net (income)	0	(1)
Total (gains) losses included in OCI attributable to liabilities still held, Included in OCI	$ 0	$ 0

Fair Value of Financial Instruments - Schedule of Liabilities Measured at Fair Value on Recurring Basis and Utilized Significant Unobservable (Level 3) Inputs to Determine Fair Value (Details) - USD ($)
$ in Millions