Investments - Schedule of AFS Securities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 162,016	$ 131,422
Allowance for Credit Losses	(591)	(459)	$ (311)
Gross Unrealized Gains	1,709	309
Gross Unrealized Losses	(14,787)	(19,047)
Fair Value	148,347	112,225
Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	147,561	120,982
Allowance for Credit Losses	(590)	(458)	(311)
Gross Unrealized Gains	1,653	295
Gross Unrealized Losses	(14,286)	(18,415)
Fair Value	134,338	102,404
Related Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,455	10,440
Allowance for Credit Losses	(1)	(1)	0
Gross Unrealized Gains	56	14
Gross Unrealized Losses	(501)	(632)
Fair Value	14,009	9,821
U.S. government and agencies \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,161	3,333
Allowance for Credit Losses	0	0
Gross Unrealized Gains	67	0
Gross Unrealized Losses	(829)	(756)
Fair Value	5,399	2,577
U.S. state, municipal and political subdivisions \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,296	1,218
Allowance for Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(250)	(291)
Fair Value	1,046	927
Foreign governments \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,083	1,207
Allowance for Credit Losses	0	(27)	0
Gross Unrealized Gains	71	3
Gross Unrealized Losses	(255)	(276)
Fair Value	1,899	907
Corporate \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	88,343	74,644
Allowance for Credit Losses	(129)	(61)	0
Gross Unrealized Gains	830	92
Gross Unrealized Losses	(10,798)	(13,774)
Fair Value	78,246	60,901
Corporate \| Related Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,423	1,028
Allowance for Credit Losses	0	0
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(72)	(47)
Fair Value	1,352	982
CLO \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,506	17,722
Allowance for Credit Losses	(2)	(7)	0
Gross Unrealized Gains	261	115
Gross Unrealized Losses	(558)	(1,337)
Fair Value	20,207	16,493
CLO \| Related Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,367	3,346
Allowance for Credit Losses	0	(1)	0
Gross Unrealized Gains	21	10
Gross Unrealized Losses	(120)	(276)
Fair Value	4,268	3,079
ABS \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,942	11,447
Allowance for Credit Losses	(49)	(29)	(5)
Gross Unrealized Gains	120	15
Gross Unrealized Losses	(630)	(906)
Fair Value	13,383	10,527
ABS \| Related Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,665	6,066
Allowance for Credit Losses	(1)	0	0
Gross Unrealized Gains	34	3
Gross Unrealized Losses	(309)	(309)
Fair Value	8,389	5,760
CMBS \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,070	4,636
Allowance for Credit Losses	(29)	(5)	0
Gross Unrealized Gains	52	6
Gross Unrealized Losses	(502)	(479)
Fair Value	6,591	4,158
RMBS \| Nonrelated Party
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,160	6,775
Allowance for Credit Losses	(381)	(329)	$ (306)
Gross Unrealized Gains	252	64
Gross Unrealized Losses	(464)	(596)
Fair Value	$ 7,567	$ 5,914

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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