Investments - Schedule of Amortized Cost, Allowance for Credit Losses, Gross Unrealized Gains and Losses and Fair Value of AFS Investments by Asset Type (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 231,440	$ 228,168
Allowance for Credit Losses	(744)	(758)	$ (709)	$ (709)
Gross Unrealized Gains	2,690	3,539
Gross Unrealized Losses	(13,912)	(12,305)
Fair Value	219,474	218,644
Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	202,108	202,116
Allowance for Credit Losses	(743)	(757)	(708)	(708)
Gross Unrealized Gains	2,561	3,330
Gross Unrealized Losses	(13,550)	(12,092)
Fair Value	190,376	192,597
Due to related parties
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,332	26,052
Allowance for Credit Losses	(1)	(1)
Gross Unrealized Gains	129	209
Gross Unrealized Losses	(362)	(213)
Fair Value	29,098	26,047
U.S. government and agencies \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,138	18,008
Allowance for Credit Losses	0	0
Gross Unrealized Gains	50	116
Gross Unrealized Losses	(1,389)	(1,226)
Fair Value	18,799	16,898
U.S. state, municipal and political subdivisions \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	942	954
Allowance for Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(195)	(195)
Fair Value	747	759
Foreign governments \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,316	2,225
Allowance for Credit Losses	0	0
Gross Unrealized Gains	24	32
Gross Unrealized Losses	(668)	(598)
Fair Value	1,672	1,659
Corporate \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	95,501	97,166
Allowance for Credit Losses	(56)	(105)	(174)	(175)
Gross Unrealized Gains	649	1,291
Gross Unrealized Losses	(10,041)	(8,921)
Fair Value	86,053	89,431
Corporate \| Due to related parties
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,491	2,287
Allowance for Credit Losses	0	0
Gross Unrealized Gains	21	43
Gross Unrealized Losses	(98)	(13)
Fair Value	3,414	2,317
CLO \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,415	25,730
Allowance for Credit Losses	0	0
Gross Unrealized Gains	436	648
Gross Unrealized Losses	(157)	(106)
Fair Value	23,694	26,272
CLO \| Due to related parties
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,766	7,103
Allowance for Credit Losses	0	0
Gross Unrealized Gains	78	121
Gross Unrealized Losses	(46)	(21)
Fair Value	6,798	7,203
ABS \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	38,062	35,275
Allowance for Credit Losses	(179)	(171)	(82)	(76)
Gross Unrealized Gains	1,101	823
Gross Unrealized Losses	(494)	(465)
Fair Value	38,490	35,462
ABS \| Due to related parties
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,922	16,500
Allowance for Credit Losses	(1)	(1)	(1)	(1)
Gross Unrealized Gains	30	45
Gross Unrealized Losses	(218)	(178)
Fair Value	18,733	16,366
CMBS \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,996	13,351
Allowance for Credit Losses	(91)	(70)	(60)	(60)
Gross Unrealized Gains	66	120
Gross Unrealized Losses	(328)	(317)
Fair Value	12,643	13,084
CMBS \| Due to related parties
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	153	162
Allowance for Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Fair Value	153	161
RMBS \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,738	9,407
Allowance for Credit Losses	(417)	(411)	$ (392)	$ (397)
Gross Unrealized Gains	235	300
Gross Unrealized Losses	(278)	(264)
Fair Value	$ 8,278	$ 9,032

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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