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Investments - Reconciliation of Available-for-Sale Securities from Cost Basis to Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 97,723		$ 97,433
Gross Unrealized Gains	712		1,091
Gross Unrealized Losses	11,222		9,767
Allowance for Credit Losses	39	$ 21	19	$ 25	$ 39	$ 22
Fair Value	87,174		88,738
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	76,519		77,085
Gross Unrealized Gains	551		852
Gross Unrealized Losses	9,744		8,272
Allowance for Credit Losses	13	10	8	13	27	9
Fair Value	67,313		69,657
U.S. government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	423		416
Gross Unrealized Gains	4		6
Gross Unrealized Losses	38		29
Allowance for Credit Losses	0		0
Fair Value	389		393
State and municipal bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,961		3,106
Gross Unrealized Gains	27		101
Gross Unrealized Losses	424		417
Allowance for Credit Losses	0		0
Fair Value	2,564		2,790
Foreign government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	303		314
Gross Unrealized Gains	12		16
Gross Unrealized Losses	55		47
Allowance for Credit Losses	0		0
Fair Value	260		283
RMBS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,000		1,948
Gross Unrealized Gains	20		28
Gross Unrealized Losses	219		197
Allowance for Credit Losses	6	6	6	6	6	7
Fair Value	1,795		1,773
CMBS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,722		1,622
Gross Unrealized Gains	2		5
Gross Unrealized Losses	182		203
Allowance for Credit Losses	0		0
Fair Value	1,542		1,424
ABS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	13,563		12,698
Gross Unrealized Gains	75		62
Gross Unrealized Losses	547		585
Allowance for Credit Losses	19	$ 4	4	$ 5	$ 5	$ 5
Fair Value	13,072		12,171
Hybrid and redeemable preferred securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	232		244
Gross Unrealized Gains	21		21
Gross Unrealized Losses	13		17
Allowance for Credit Losses	1		1
Fair Value	$ 239		$ 247