Investments - Analysis of Cost or Amortized Cost, Gross Unrealized Gains and Losses and Fair Value for Investments (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale
Total	$ 13,708	$ 12,979
Gross unrealized gain	62	61
Gross unrealized loss	900	908
Fixed maturities, at fair value	12,870	12,132
Corporate
Debt Securities, Available-for-sale
Total	7,719	7,412
Gross unrealized gain	39	37
Gross unrealized loss	608	580
Fixed maturities, at fair value	7,150	6,869
States, municipalities and political subdivisions
Debt Securities, Available-for-sale
Total	4,951	4,901
Gross unrealized gain	23	24
Gross unrealized loss	262	303
Fixed maturities, at fair value	4,712	4,622
Government-sponsored enterprises
Debt Securities, Available-for-sale
Total	582	186
Gross unrealized gain	0	0
Gross unrealized loss	8	3
Fixed maturities, at fair value	574	183
Commercial mortgage-backed
Debt Securities, Available-for-sale
Total	227	250
Gross unrealized gain	0	0
Gross unrealized loss	17	16
Fixed maturities, at fair value	210	234
United States government
Debt Securities, Available-for-sale
Total	209	196
Gross unrealized gain	0	0
Gross unrealized loss	5	5
Fixed maturities, at fair value	204	191
Foreign government
Debt Securities, Available-for-sale
Total	20	34
Gross unrealized gain	0	0
Gross unrealized loss	0	1
Fixed maturities, at fair value	$ 20	$ 33