Derivatives - Derivatives included in the Balance Sheet at fair value (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Other assets	$ 80	$ 87
Derivative liability	28	22
Interest rate swaps | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Other assets	0	1
Derivative liability	$ 28	$ 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 | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Other assets	$ 77	$ 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	$ 3	5
Derivative liability	$ 0	$ 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