Derivatives - Derivatives included in the Balance Sheet at fair value (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Other assets	$ 70	$ 82
Derivative liability	14	18
Interest rate swaps | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Other assets	0	1
Derivative liability	$ 9	$ 14
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
Fixed maturities with embedded derivatives | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Other assets	$ 70	$ 81
Derivative liability	$ 0	0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Available for sale (AFS) fixed maturities
Total return swap | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Other assets	$ 0	0
Derivative liability	$ 5	$ 4
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities