Investments - Mortgage Loans (Details) - Commercial Real Estate - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Mortgage Loans on Real Estate [Line Items]
New mortgage loans	$ 63	$ 125	$ 286	$ 305
Mortgage loans fully repaid	17	62	34	136
Mortgage loans foreclosed	$ 0	$ 0	$ 0	$ 0