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Investments - Analysis of Cost or Amortized Cost, Gross Unrealized Gains and Losses and Fair Value for Investments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale
Total	$ 16,074	$ 14,361
Gross unrealized gain	201	117
Gross unrealized loss	404	687
Fixed maturities, at fair value	15,871	13,791
Corporate
Debt Securities, Available-for-sale
Total	8,407	7,836
Gross unrealized gain	150	70
Gross unrealized loss	218	454
Fixed maturities, at fair value	8,339	7,452
States, municipalities and political subdivisions
Debt Securities, Available-for-sale
Total	4,944	4,867
Gross unrealized gain	41	44
Gross unrealized loss	176	208
Fixed maturities, at fair value	4,809	4,703
Government-sponsored enterprises
Debt Securities, Available-for-sale
Total	2,147	1,227
Gross unrealized gain	5	3
Gross unrealized loss	1	6
Fixed maturities, at fair value	2,151	1,224
Asset-backed
Debt Securities, Available-for-sale
Total	317	203
Gross unrealized gain	4	0
Gross unrealized loss	7	16
Fixed maturities, at fair value	314	187
United States government
Debt Securities, Available-for-sale
Total	228	203
Gross unrealized gain	1	0
Gross unrealized loss	2	3
Fixed maturities, at fair value	227	200
Foreign government
Debt Securities, Available-for-sale
Total	31	25
Gross unrealized gain	0	0
Gross unrealized loss	0	0
Fixed maturities, at fair value	$ 31	$ 25

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