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Investments - Consolidated Investments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Available-for-sale securities
Amortized Cost	$ 47,789	$ 45,606
Allowance for Expected Credit Losses	(40)	(42)
Gross Unrealized Gains	500	457
Gross Unrealized Losses	(3,683)	(3,648)
Fair Value/Carrying Value	44,566	42,373
Asset-backed securities
Available-for-sale securities
Amortized Cost	15,254	14,631
Allowance for Expected Credit Losses	(11)	(11)
Gross Unrealized Gains	280	191
Gross Unrealized Losses	(408)	(469)
Fair Value/Carrying Value	15,115	14,342
Commercial mortgage-backed securities
Available-for-sale securities
Amortized Cost	5,040	4,797
Allowance for Expected Credit Losses	(21)	(22)
Gross Unrealized Gains	38	23
Gross Unrealized Losses	(239)	(323)
Fair Value/Carrying Value	4,818	4,475
Corporates
Available-for-sale securities
Amortized Cost	21,430	20,133
Allowance for Expected Credit Losses	(7)	(6)
Gross Unrealized Gains	133	186
Gross Unrealized Losses	(2,585)	(2,417)
Fair Value/Carrying Value	18,971	17,896
Hybrids
Available-for-sale securities
Amortized Cost	667	668
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	4	3
Gross Unrealized Losses	(38)	(53)
Fair Value/Carrying Value	633	618
Municipals
Available-for-sale securities
Amortized Cost	1,773	1,826
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	11	14
Gross Unrealized Losses	(237)	(229)
Fair Value/Carrying Value	1,547	1,611
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	2,550	2,507
Allowance for Expected Credit Losses	(1)	(3)
Gross Unrealized Gains	31	29
Gross Unrealized Losses	(116)	(104)
Fair Value/Carrying Value	2,464	2,429
U.S. Government
Available-for-sale securities
Amortized Cost	706	679
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	3	8
Gross Unrealized Losses	(11)	(9)
Fair Value/Carrying Value	698	678
Foreign Governments
Available-for-sale securities
Amortized Cost	369	365
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(49)	(44)
Fair Value/Carrying Value	$ 320	$ 324

X

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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