Derivatives - Derivatives included in the Balance Sheet at fair value (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative asset	$ 80	$ 40
Derivative liability	48	42
Interest rate swaps | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative asset	0	0
Derivative liability	$ 43	$ 37
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]
Derivative asset	$ 80	$ 40
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]
Derivative asset	$ 0	0
Derivative liability	$ 5	$ 5
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities