Investments - Fair Value and Gross Unrealized Losses in a Continuous Unrealized Loss Position (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2025 USD ($) security	Dec. 31, 2024 USD ($) security
Fair Value
Less Than or Equal to Twelve Months	$ 20,949	$ 30,166
Greater Than Twelve Months	41,155	36,345
Total	62,104	66,511
Gross Unrealized Losses
Less Than or Equal to Twelve Months	3,627	4,537
Greater Than Twelve Months	6,352	6,468
Total	$ 9,979	$ 11,005
Total number of fixed maturity AFS securities in an unrealized loss position | security	6,381	6,985
Unrealized holding losses arising during the period	$ 18	$ 23
Corporate bonds
Fair Value
Less Than or Equal to Twelve Months	16,755	24,657
Greater Than Twelve Months	33,798	29,786
Total	50,553	54,443
Gross Unrealized Losses
Less Than or Equal to Twelve Months	3,309	4,054
Greater Than Twelve Months	5,540	5,601
Total	8,849	9,655
U.S. government bonds
Fair Value
Less Than or Equal to Twelve Months	51	86
Greater Than Twelve Months	223	224
Total	274	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	742	1,087
Greater Than Twelve Months	965	760
Total	1,707	1,847
Gross Unrealized Losses
Less Than or Equal to Twelve Months	192	228
Greater Than Twelve Months	234	217
Total	426	445
Foreign government bonds
Fair Value
Less Than or Equal to Twelve Months	26	32
Greater Than Twelve Months	126	118
Total	152	150
Gross Unrealized Losses
Less Than or Equal to Twelve Months	4	5
Greater Than Twelve Months	51	51
Total	55	56
RMBS
Fair Value
Less Than or Equal to Twelve Months	645	795
Greater Than Twelve Months	832	760
Total	1,477	1,555
Gross Unrealized Losses
Less Than or Equal to Twelve Months	52	76
Greater Than Twelve Months	127	144
Total	179	220
CMBS
Fair Value
Less Than or Equal to Twelve Months	329	579
Greater Than Twelve Months	1,016	777
Total	1,345	1,356
Gross Unrealized Losses
Less Than or Equal to Twelve Months	18	50
Greater Than Twelve Months	100	106
Total	118	156
ABS
Fair Value
Less Than or Equal to Twelve Months	2,379	2,907
Greater Than Twelve Months	4,105	3,827
Total	6,484	6,734
Gross Unrealized Losses
Less Than or Equal to Twelve Months	48	118
Greater Than Twelve Months	259	303
Total	307	421
Hybrid and redeemable preferred securities
Fair Value
Less Than or Equal to Twelve Months	22	23
Greater Than Twelve Months	90	93
Total	112	116
Gross Unrealized Losses
Less Than or Equal to Twelve Months	2	3
Greater Than Twelve Months	9	8
Total	$ 11	$ 11