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Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	$ 39,533	$ 40,788
Debt Securities, Available-for-sale, Allowance for Credit Loss	(12)	(1)	$ (23)	$ 0
Gross Unrealized Gains, fixed maturities, available-for-sale	152	2,204
Gross Unrealized Losses, fixed maturities, available-for-sale	(3,442)	(144)
Total fixed maturities	36,231	42,847
Amortized Cost
One year or less	1,417	1,400
Over one year through five years	8,340	8,615
Over five years through ten years	7,259	8,303
Over ten years	9,532	10,761
Subtotal	26,548	29,079
Mortgage-backed and asset-backed securities	12,985	11,709
Fair Value
One year or less	1,396	1,419
Over one year through five years	7,930	8,894
Over five years through ten years	6,485	8,633
Over ten years	8,462	11,979
Subtotal	24,273	30,925
Mortgage-backed and asset-backed securities	11,958	11,922
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,016	1,125
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	0	13
Gross Unrealized Losses, fixed maturities, available-for-sale	(75)	(3)
Total fixed maturities	1,941	1,135
CLO
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,040	3,019
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	3	8
Gross Unrealized Losses, fixed maturities, available-for-sale	(102)	(2)
Total fixed maturities	2,941	3,025
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	3,715	3,955
Debt Securities, Available-for-sale, Allowance for Credit Loss	(10)	0
Gross Unrealized Gains, fixed maturities, available-for-sale	21	179
Gross Unrealized Losses, fixed maturities, available-for-sale	(358)	(15)
Total fixed maturities	3,368	4,119
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	16,794	17,744
Debt Securities, Available-for-sale, Allowance for Credit Loss	(2)	(1)	(23)	0
Gross Unrealized Gains, fixed maturities, available-for-sale	33	1,038
Gross Unrealized Losses, fixed maturities, available-for-sale	(1,592)	(74)
Total fixed maturities	15,233	18,707
Foreign government/government agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	596	883
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	0	33
Gross Unrealized Losses, fixed maturities, available-for-sale	(49)	(6)
Total fixed maturities	547	910
Municipal
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	6,718	7,473
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0	$ 0	$ 0
Gross Unrealized Gains, fixed maturities, available-for-sale	93	787
Gross Unrealized Losses, fixed maturities, available-for-sale	(515)	(3)
Total fixed maturities	6,296	8,257
Residential mortgage-backed securities ("RMBS")
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	4,214	3,610
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	2	60
Gross Unrealized Losses, fixed maturities, available-for-sale	(508)	(27)
Total fixed maturities	3,708	3,643
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale, at fair value, amortized cost	2,440	2,979
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Gross Unrealized Gains, fixed maturities, available-for-sale	0	86
Gross Unrealized Losses, fixed maturities, available-for-sale	(243)	(14)
Total fixed maturities	$ 2,197	$ 3,051

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