Investments - Reconciliation of Available-for-Sale Securities from Cost Basis to Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 97,415	$ 97,433
Gross Unrealized Gains	747	1,091
Gross Unrealized Losses	11,005	9,767
Allowance for Credit Losses	46	19	$ 22	$ 19
Fair Value	87,111	88,738
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	75,556	77,085
Gross Unrealized Gains	563	852
Gross Unrealized Losses	9,655	8,272
Allowance for Credit Losses	14	8	9	17
Fair Value	66,450	69,657
U.S. government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	429	416
Gross Unrealized Gains	3	6
Gross Unrealized Losses	41	29
Allowance for Credit Losses	0	0
Fair Value	391	393
State and municipal bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,798	3,106
Gross Unrealized Gains	18	101
Gross Unrealized Losses	445	417
Allowance for Credit Losses	0	0
Fair Value	2,371	2,790
Foreign government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	282	314
Gross Unrealized Gains	11	16
Gross Unrealized Losses	56	47
Allowance for Credit Losses	0	0
Fair Value	237	283
RMBS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,066	1,948
Gross Unrealized Gains	24	28
Gross Unrealized Losses	220	197
Allowance for Credit Losses	7	6	7	1
Fair Value	1,863	1,773
CMBS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,817	1,622
Gross Unrealized Gains	4	5
Gross Unrealized Losses	156	203
Allowance for Credit Losses	0	0
Fair Value	1,665	1,424
ABS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	14,226	12,698
Gross Unrealized Gains	99	62
Gross Unrealized Losses	421	585
Allowance for Credit Losses	24	4	$ 5	$ 1
Fair Value	13,880	12,171
Hybrid and redeemable preferred securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	241	244
Gross Unrealized Gains	25	21
Gross Unrealized Losses	11	17
Allowance for Credit Losses	1	1
Fair Value	$ 254	$ 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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