Derivative Instruments - Schedule of Positions in Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Derivative assets, at fair value	$ 39	$ 56
Derivative liabilities, fair value	$ 1,129	$ 991
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Derivatives designated as hedges
Derivative [Line Items]
Derivative assets, at fair value	$ 21	$ 37
Derivative liabilities, fair value	924	794
Derivatives designated as hedges | Cash flow hedges
Derivative [Line Items]
Derivative assets, at fair value	21	37
Derivative liabilities, fair value	924	794
Derivatives designated as hedges | Cash flow hedges | Interest rate swaps | Other invested assets
Derivative [Line Items]
Derivative assets, at fair value	11	18
Derivatives designated as hedges | Cash flow hedges | Interest rate swaps | Other liabilities
Derivative [Line Items]
Derivative liabilities, fair value	849	749
Derivatives designated as hedges | Cash flow hedges | Foreign currency swaps | Other invested assets
Derivative [Line Items]
Derivative assets, at fair value	4	13
Derivatives designated as hedges | Cash flow hedges | Foreign currency swaps | Other liabilities
Derivative [Line Items]
Derivative liabilities, fair value	4	1
Derivatives designated as hedges | Cash flow hedges | Forward bond purchase commitments | Other invested assets
Derivative [Line Items]
Derivative assets, at fair value	6	6
Derivatives designated as hedges | Cash flow hedges | Forward bond purchase commitments | Other liabilities
Derivative [Line Items]
Derivative liabilities, fair value	71	44
Derivatives not designated as hedges
Derivative [Line Items]
Derivative assets, at fair value	18	19
Derivative liabilities, fair value	205	197
Derivatives not designated as hedges | Forward bond purchase commitments | Other invested assets
Derivative [Line Items]
Derivative assets, at fair value	0	0
Derivatives not designated as hedges | Forward bond purchase commitments | Other liabilities
Derivative [Line Items]
Derivative liabilities, fair value	36	27
Derivatives not designated as hedges | Equity index options | Other invested assets
Derivative [Line Items]
Derivative assets, at fair value	18	19
Derivatives not designated as hedges | Equity index options | Other liabilities
Derivative [Line Items]
Derivative liabilities, fair value	0	0
Derivatives not designated as hedges | Financial futures | Other invested assets
Derivative [Line Items]
Derivative assets, at fair value	0	0
Derivatives not designated as hedges | Financial futures | Other liabilities
Derivative [Line Items]
Derivative liabilities, fair value	0	0
Derivatives not designated as hedges | Foreign currency forward contracts | Other invested assets
Derivative [Line Items]
Derivative assets, at fair value	0	0
Derivatives not designated as hedges | Foreign currency forward contracts | Other liabilities
Derivative [Line Items]
Derivative liabilities, fair value	17	0
Derivatives not designated as hedges | Fixed indexed annuity embedded derivatives | Policyholder account balances:
Derivative [Line Items]
Derivative liabilities, fair value	138	155
Derivatives not designated as hedges | Fixed indexed annuity embedded derivatives | Other assets
Derivative [Line Items]
Derivative assets, at fair value	0	0
Derivatives not designated as hedges | Indexed universal life embedded derivatives | Policyholder account balances:
Derivative [Line Items]
Derivative liabilities, fair value	14	15
Derivatives not designated as hedges | Indexed universal life embedded derivatives | Reinsurance recoverable
Derivative [Line Items]
Derivative assets, at fair value	$ 0	$ 0