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	$ 11,757	$ 21,106
Greater Than Twelve Months	40,374	35,528
Total	52,131	56,634
Gross Unrealized Losses
Less Than or Equal to Twelve Months	833	1,524
Greater Than Twelve Months	6,145	6,262
Total	$ 6,978	$ 7,786
Total number of fixed maturity AFS securities in an unrealized loss position | security	6,022	6,645
Unrealized holding losses arising during the period	$ 18	$ 23
Corporate bonds
Fair Value
Less Than or Equal to Twelve Months	8,443	16,388
Greater Than Twelve Months	33,094	29,045
Total	41,537	45,433
Gross Unrealized Losses
Less Than or Equal to Twelve Months	749	1,290
Greater Than Twelve Months	5,350	5,414
Total	6,099	6,704
U.S. government bonds
Fair Value
Less Than or Equal to Twelve Months	51	85
Greater Than Twelve Months	223	224
Total	274	309
Gross Unrealized Losses
Less Than or Equal to Twelve Months	1	3
Greater Than Twelve Months	32	37
Total	33	40
State and municipal bonds
Fair Value
Less Than or Equal to Twelve Months	282	652
Greater Than Twelve Months	923	721
Total	1,205	1,373
Gross Unrealized Losses
Less Than or Equal to Twelve Months	26	61
Greater Than Twelve Months	226	209
Total	252	270
Foreign government bonds
Fair Value
Less Than or Equal to Twelve Months	19	29
Greater Than Twelve Months	126	118
Total	145	147
Gross Unrealized Losses
Less Than or Equal to Twelve Months	3	5
Greater Than Twelve Months	51	51
Total	54	56
RMBS
Fair Value
Less Than or Equal to Twelve Months	473	658
Greater Than Twelve Months	798	724
Total	1,271	1,382
Gross Unrealized Losses
Less Than or Equal to Twelve Months	10	29
Greater Than Twelve Months	118	133
Total	128	162
CMBS
Fair Value
Less Than or Equal to Twelve Months	195	475
Greater Than Twelve Months	1,016	777
Total	1,211	1,252
Gross Unrealized Losses
Less Than or Equal to Twelve Months	3	29
Greater Than Twelve Months	100	106
Total	103	135
ABS
Fair Value
Less Than or Equal to Twelve Months	2,277	2,801
Greater Than Twelve Months	4,104	3,826
Total	6,381	6,627
Gross Unrealized Losses
Less Than or Equal to Twelve Months	40	106
Greater Than Twelve Months	259	303
Total	299	409
Hybrid and redeemable preferred securities
Fair Value
Less Than or Equal to Twelve Months	17	18
Greater Than Twelve Months	90	93
Total	107	111
Gross Unrealized Losses
Less Than or Equal to Twelve Months	1	1
Greater Than Twelve Months	9	9
Total	$ 10	$ 10