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Investments - Consolidated Investments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale securities
Amortized Cost	$ 37,708	$ 30,705
Allowance for Expected Credit Losses	(39)	(8)
Gross Unrealized Gains	98	1,518
Gross Unrealized Losses	(4,672)	(225)
Fair Value/Carrying Value	33,095	31,990
Asset-backed securities
Available-for-sale securities
Amortized Cost	12,209	8,516
Allowance for Expected Credit Losses	(8)	(3)
Gross Unrealized Gains	36	220
Gross Unrealized Losses	(770)	(38)
Fair Value/Carrying Value	11,467	8,695
Commercial mortgage-backed securities
Available-for-sale securities
Amortized Cost	3,337	2,684
Allowance for Expected Credit Losses	(1)	(2)
Gross Unrealized Gains	11	308
Gross Unrealized Losses	(284)	(11)
Fair Value/Carrying Value	3,063	2,979
Corporates
Available-for-sale securities
Amortized Cost	17,396	15,822
Allowance for Expected Credit Losses	(22)	0
Gross Unrealized Gains	32	830
Gross Unrealized Losses	(3,069)	(158)
Fair Value/Carrying Value	14,337	16,494
Hybrids
Available-for-sale securities
Amortized Cost	806	838
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	9	74
Gross Unrealized Losses	(84)	0
Fair Value/Carrying Value	731	912
Municipals
Available-for-sale securities
Amortized Cost	1,749	1,445
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	4	67
Gross Unrealized Losses	(293)	(11)
Fair Value/Carrying Value	1,460	1,501
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	1,638	731
Allowance for Expected Credit Losses	(8)	(3)
Gross Unrealized Gains	6	7
Gross Unrealized Losses	(109)	(4)
Fair Value/Carrying Value	1,527	731
U.S. Government
Available-for-sale securities
Amortized Cost	287	393
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(16)	(2)
Fair Value/Carrying Value	271	394
Foreign Governments
Available-for-sale securities
Amortized Cost	286	276
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	9
Gross Unrealized Losses	(47)	(1)
Fair Value/Carrying Value	$ 239	$ 284

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