Derivatives - Derivatives included in the Balance Sheet at fair value (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative asset	$ 82	$ 87
Derivative liability	18	22
Interest rate swaps | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative asset	1	1
Derivative liability	$ 14	$ 22
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 | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative asset	$ 81	$ 81
Derivative liability	$ 0	$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Available for sale (AFS) fixed maturities	Available for sale (AFS) fixed maturities
Total return swap | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative asset	$ 0	$ 5
Derivative liability	$ 4	$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities