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Investments - Consolidated Investments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale securities
Amortized Cost	$ 32,508	$ 30,705
Allowance for Expected Credit Losses	(11)	(8)	$ (7)	$ (19)
Gross Unrealized Gains	545	1,518
Gross Unrealized Losses	(1,564)	(225)
Fair Value/ Carrying Value	31,478	31,990
Asset-backed securities
Available-for-sale securities
Amortized Cost	9,137	8,516
Allowance for Expected Credit Losses	(1)	(3)
Gross Unrealized Gains	129	220
Gross Unrealized Losses	(207)	(38)
Fair Value/ Carrying Value	9,058	8,695
Commercial mortgage-backed securities
Available-for-sale securities
Amortized Cost	2,951	2,684
Allowance for Expected Credit Losses	(2)	(2)	(1)	0
Gross Unrealized Gains	170	308
Gross Unrealized Losses	(67)	(11)
Fair Value/ Carrying Value	3,052	2,979
Corporates
Available-for-sale securities
Amortized Cost	16,480	15,822
Allowance for Expected Credit Losses	(3)	0	(3)	(16)
Gross Unrealized Gains	188	830
Gross Unrealized Losses	(1,124)	(158)
Fair Value/ Carrying Value	15,541	16,494
Hybrids
Available-for-sale securities
Amortized Cost	832	838
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	31	74
Gross Unrealized Losses	(14)	0
Fair Value/ Carrying Value	849	912
Municipals
Available-for-sale securities
Amortized Cost	1,444	1,445
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	17	67
Gross Unrealized Losses	(89)	(11)
Fair Value/ Carrying Value	1,372	1,501
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	801	731
Allowance for Expected Credit Losses	(5)	(3)	$ (3)	$ (3)
Gross Unrealized Gains	4	7
Gross Unrealized Losses	(39)	(4)
Fair Value/ Carrying Value	761	731
U.S. Government
Available-for-sale securities
Amortized Cost	594	393
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	3	3
Gross Unrealized Losses	(10)	(2)
Fair Value/ Carrying Value	587	394
Foreign Governments
Available-for-sale securities
Amortized Cost	269	276
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	3	9
Gross Unrealized Losses	(14)	(1)
Fair Value/ Carrying Value	$ 258	$ 284

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