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Investments - Schedule of Consolidated Investments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Available-for-sale securities
Amortized Cost	$ 52,973	$ 51,681
Allowance for Expected Credit Losses	(85)	(67)
Gross Unrealized Gains	436	406
Gross Unrealized Losses	(3,500)	(3,802)
Fair Value/Carrying Value	49,824	48,218
Asset-backed securities
Available-for-sale securities
Amortized Cost	16,435	15,784
Allowance for Expected Credit Losses	(15)	(13)
Gross Unrealized Gains	174	202
Gross Unrealized Losses	(326)	(317)
Fair Value/Carrying Value	16,268	15,656
Commercial mortgage-backed securities
Available-for-sale securities
Amortized Cost	5,312	5,379
Allowance for Expected Credit Losses	(50)	(49)
Gross Unrealized Gains	51	53
Gross Unrealized Losses	(171)	(201)
Fair Value/Carrying Value	5,142	5,182
Corporates
Available-for-sale securities
Amortized Cost	25,223	24,425
Allowance for Expected Credit Losses	(19)	(5)
Gross Unrealized Gains	156	108
Gross Unrealized Losses	(2,612)	(2,832)
Fair Value/Carrying Value	22,748	21,696
Hybrids
Available-for-sale securities
Amortized Cost	537	604
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	3	6
Gross Unrealized Losses	(28)	(29)
Fair Value/Carrying Value	512	581
Municipals
Available-for-sale securities
Amortized Cost	1,636	1,638
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	5	3
Gross Unrealized Losses	(231)	(255)
Fair Value/Carrying Value	1,410	1,386
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	2,787	2,869
Allowance for Expected Credit Losses	(1)	0
Gross Unrealized Gains	41	32
Gross Unrealized Losses	(79)	(105)
Fair Value/Carrying Value	2,748	2,796
U.S. Government
Available-for-sale securities
Amortized Cost	671	645
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	5	2
Gross Unrealized Losses	(4)	(10)
Fair Value/Carrying Value	672	637
Foreign Governments
Available-for-sale securities
Amortized Cost	372	337
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(49)	(53)
Fair Value/Carrying Value	$ 324	$ 284

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
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
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