Investments - Reconciliation of Available-for-Sale Securities from Cost Basis to Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 97,546	$ 97,433
Gross Unrealized Gains	820	1,091
Gross Unrealized Losses	10,581	9,767
Allowance for Credit Losses	21	19	$ 39	$ 22
Fair Value	87,764	88,738
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	76,968	77,085
Gross Unrealized Gains	640	852
Gross Unrealized Losses	9,065	8,272
Allowance for Credit Losses	10	8	27	9
Fair Value	68,533	69,657
U.S. government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	422	416
Gross Unrealized Gains	4	6
Gross Unrealized Losses	35	29
Allowance for Credit Losses	0	0
Fair Value	391	393
State and municipal bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,097	3,106
Gross Unrealized Gains	46	101
Gross Unrealized Losses	400	417
Allowance for Credit Losses	0	0
Fair Value	2,743	2,790
Foreign government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	304	314
Gross Unrealized Gains	12	16
Gross Unrealized Losses	53	47
Allowance for Credit Losses	0	0
Fair Value	263	283
RMBS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,962	1,948
Gross Unrealized Gains	20	28
Gross Unrealized Losses	217	197
Allowance for Credit Losses	6	6	$ 6	$ 7
Fair Value	1,759	1,773
CMBS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,658	1,622
Gross Unrealized Gains	4	5
Gross Unrealized Losses	178	203
Allowance for Credit Losses	0	0
Fair Value	1,484	1,424
ABS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	12,903	12,698
Gross Unrealized Gains	71	62
Gross Unrealized Losses	621	585
Allowance for Credit Losses	4	4
Fair Value	12,349	12,171
Hybrid and redeemable preferred securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	232	244
Gross Unrealized Gains	23	21
Gross Unrealized Losses	12	17
Allowance for Credit Losses	1	1
Fair Value	$ 242	$ 247

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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