Derivatives - Derivatives included in the Balance Sheet at fair value (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative asset	$ 40	$ 59
Derivative liability	$ 42	0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Available for sale (AFS) fixed maturities
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities
Interest rate swaps | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative asset	$ 0	0
Derivative liability	37	0
MBS with embedded derivatives | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative asset	40	59
Derivative liability	0	0
Total return swap | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative asset	0	0
Derivative liability	$ 5	$ 0