Investments - Fair Value and Gross Unrealized Losses in a Continuous Unrealized Loss Position (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($) security	Dec. 31, 2024 USD ($) security
Fair Value
Less Than or Equal to Twelve Months	$ 29,293	$ 30,166
Greater Than Twelve Months	35,734	36,345
Total	65,027	66,511
Gross Unrealized Losses
Less Than or Equal to Twelve Months	4,217	4,537
Greater Than Twelve Months	6,046	6,468
Total	$ 10,263	$ 11,005
Total number of fixed maturity AFS securities in an unrealized loss position | security	6,835	6,985,000,000
Unrealized holding gains (losses) arising during the period	$ (12)	$ (23)
Corporate bonds
Fair Value
Less Than or Equal to Twelve Months	23,140	24,657
Greater Than Twelve Months	29,434	29,786
Total	52,574	54,443
Gross Unrealized Losses
Less Than or Equal to Twelve Months	3,798	4,054
Greater Than Twelve Months	5,287	5,601
Total	9,085	9,655
U.S. government bonds
Fair Value
Less Than or Equal to Twelve Months	67	86
Greater Than Twelve Months	230	224
Total	297	310
Gross Unrealized Losses
Less Than or Equal to Twelve Months	2	3
Greater Than Twelve Months	32	38
Total	34	41
State and municipal bonds
Fair Value
Less Than or Equal to Twelve Months	940	1,087
Greater Than Twelve Months	766	760
Total	1,706	1,847
Gross Unrealized Losses
Less Than or Equal to Twelve Months	214	228
Greater Than Twelve Months	201	217
Total	415	445
Foreign government bonds
Fair Value
Less Than or Equal to Twelve Months	32	32
Greater Than Twelve Months	119	118
Total	151	150
Gross Unrealized Losses
Less Than or Equal to Twelve Months	6	5
Greater Than Twelve Months	50	51
Total	56	56
RMBS
Fair Value
Less Than or Equal to Twelve Months	660	795
Greater Than Twelve Months	786	760
Total	1,446	1,555
Gross Unrealized Losses
Less Than or Equal to Twelve Months	58	76
Greater Than Twelve Months	128	144
Total	186	220
CMBS
Fair Value
Less Than or Equal to Twelve Months	610	579
Greater Than Twelve Months	785	777
Total	1,395	1,356
Gross Unrealized Losses
Less Than or Equal to Twelve Months	43	50
Greater Than Twelve Months	94	106
Total	137	156
ABS
Fair Value
Less Than or Equal to Twelve Months	3,820	2,907
Greater Than Twelve Months	3,522	3,827
Total	7,342	6,734
Gross Unrealized Losses
Less Than or Equal to Twelve Months	94	118
Greater Than Twelve Months	246	303
Total	340	421
Hybrid and redeemable preferred securities
Fair Value
Less Than or Equal to Twelve Months	24	23
Greater Than Twelve Months	92	93
Total	116	116
Gross Unrealized Losses
Less Than or Equal to Twelve Months	2	3
Greater Than Twelve Months	8	8
Total	$ 10	$ 11