Investments - Investments - ACL on Fixed Maturities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	$ 12	$ 1
Credit losses on fixed maturities where credit losses were not previously recorded	4	12
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period	1	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance	17	13
Corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	2	1
Credit losses on fixed maturities where credit losses were not previously recorded	4	8
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance	6	9
Foreign Govt./Govt. Agencies
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	0	0
Credit losses on fixed maturities where credit losses were not previously recorded		3
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period		0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance	0	3
CMBS
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	10	0
Credit losses on fixed maturities where credit losses were not previously recorded	0	1
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period	1	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance	$ 11	$ 1