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Investments - Consolidated Investments (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale securities
Amortized Cost	$ 40,219	$ 37,708
Allowance for Expected Credit Losses	(20)	(39)
Gross Unrealized Gains	146	98
Gross Unrealized Losses	(4,235)	(4,672)
Fair Value/Carrying Value	36,110	33,095
Asset-backed securities
Available-for-sale securities
Amortized Cost	12,620	12,209
Allowance for Expected Credit Losses	(10)	(8)
Gross Unrealized Gains	43	36
Gross Unrealized Losses	(761)	(770)
Fair Value/Carrying Value	11,892	11,467
Commercial mortgage-backed securities
Available-for-sale securities
Amortized Cost	4,048	3,337
Allowance for Expected Credit Losses	0	(1)
Gross Unrealized Gains	3	11
Gross Unrealized Losses	(336)	(284)
Fair Value/Carrying Value	3,715	3,063
Corporates
Available-for-sale securities
Amortized Cost	18,426	17,396
Allowance for Expected Credit Losses	(3)	(22)
Gross Unrealized Gains	64	32
Gross Unrealized Losses	(2,656)	(3,069)
Fair Value/Carrying Value	15,831	14,337
Hybrids
Available-for-sale securities
Amortized Cost	853	806
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	9	9
Gross Unrealized Losses	(82)	(84)
Fair Value/Carrying Value	780	731
Municipals
Available-for-sale securities
Amortized Cost	1,850	1,749
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	13	4
Gross Unrealized Losses	(234)	(293)
Fair Value/Carrying Value	1,629	1,460
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	1,770	1,638
Allowance for Expected Credit Losses	(7)	(8)
Gross Unrealized Gains	13	6
Gross Unrealized Losses	(107)	(109)
Fair Value/Carrying Value	1,669	1,527
U.S. Government
Available-for-sale securities
Amortized Cost	341	287
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(12)	(16)
Fair Value/Carrying Value	329	271
Foreign Governments
Available-for-sale securities
Amortized Cost	311	286
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(47)	(47)
Fair Value/Carrying Value	$ 265	$ 239

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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