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	$ 20,346	$ 21,106
Greater Than Twelve Months	34,921	35,528
Total	55,267	56,634
Gross Unrealized Losses
Less Than or Equal to Twelve Months	1,438	1,524
Greater Than Twelve Months	5,834	6,262
Total	$ 7,272	$ 7,786
Total number of fixed maturity AFS securities in an unrealized loss position | security	6,492	6,645,000,000
Unrealized holding losses arising during the period	$ 12	$ 23
Corporate bonds
Fair Value
Less Than or Equal to Twelve Months	15,046	16,388
Greater Than Twelve Months	28,698	29,045
Total	43,744	45,433
Gross Unrealized Losses
Less Than or Equal to Twelve Months	1,251	1,290
Greater Than Twelve Months	5,093	5,414
Total	6,344	6,704
U.S. government bonds
Fair Value
Less Than or Equal to Twelve Months	54	85
Greater Than Twelve Months	230	224
Total	284	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	497	652
Greater Than Twelve Months	727	721
Total	1,224	1,373
Gross Unrealized Losses
Less Than or Equal to Twelve Months	56	61
Greater Than Twelve Months	193	209
Total	249	270
Foreign government bonds
Fair Value
Less Than or Equal to Twelve Months	29	29
Greater Than Twelve Months	119	118
Total	148	147
Gross Unrealized Losses
Less Than or Equal to Twelve Months	4	5
Greater Than Twelve Months	50	51
Total	54	56
RMBS
Fair Value
Less Than or Equal to Twelve Months	493	658
Greater Than Twelve Months	749	724
Total	1,242	1,382
Gross Unrealized Losses
Less Than or Equal to Twelve Months	15	29
Greater Than Twelve Months	118	133
Total	133	162
CMBS
Fair Value
Less Than or Equal to Twelve Months	490	475
Greater Than Twelve Months	785	777
Total	1,275	1,252
Gross Unrealized Losses
Less Than or Equal to Twelve Months	25	29
Greater Than Twelve Months	94	106
Total	119	135
ABS
Fair Value
Less Than or Equal to Twelve Months	3,719	2,801
Greater Than Twelve Months	3,521	3,826
Total	7,240	6,627
Gross Unrealized Losses
Less Than or Equal to Twelve Months	85	106
Greater Than Twelve Months	246	303
Total	331	409
Hybrid and redeemable preferred securities
Fair Value
Less Than or Equal to Twelve Months	18	18
Greater Than Twelve Months	92	93
Total	110	111
Gross Unrealized Losses
Less Than or Equal to Twelve Months	1	1
Greater Than Twelve Months	8	9
Total	$ 9	$ 10