Investments - Fair Value and Gross Unrealized Losses in a Continuous Unrealized Loss Position (Details) security in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Fair Value
Less Than or Equal to Twelve Months	$ 30,166	$ 17,427
Greater Than Twelve Months	36,345	44,508
Total	66,511	61,935
Gross Unrealized Losses
Less Than or Equal to Twelve Months	4,537	3,526
Greater Than Twelve Months	6,468	6,241
Total	$ 11,005	$ 9,767
Total number of fixed maturity AFS securities in an unrealized loss position | security	6,985	7,605
Unrealized holding losses arising during the period	$ 23	$ 8
Corporate bonds
Fair Value
Less Than or Equal to Twelve Months	24,657	14,005
Greater Than Twelve Months	29,786	34,595
Total	54,443	48,600
Gross Unrealized Losses
Less Than or Equal to Twelve Months	4,054	3,270
Greater Than Twelve Months	5,601	5,002
Total	9,655	8,272
U.S. government bonds
Fair Value
Less Than or Equal to Twelve Months	86	65
Greater Than Twelve Months	224	195
Total	310	260
Gross Unrealized Losses
Less Than or Equal to Twelve Months	3	6
Greater Than Twelve Months	38	23
Total	41	29
State and municipal bonds
Fair Value
Less Than or Equal to Twelve Months	1,087	371
Greater Than Twelve Months	760	874
Total	1,847	1,245
Gross Unrealized Losses
Less Than or Equal to Twelve Months	228	72
Greater Than Twelve Months	217	345
Total	445	417
Foreign government bonds
Fair Value
Less Than or Equal to Twelve Months	32	111
Greater Than Twelve Months	118	57
Total	150	168
Gross Unrealized Losses
Less Than or Equal to Twelve Months	5	31
Greater Than Twelve Months	51	16
Total	56	47
RMBS
Fair Value
Less Than or Equal to Twelve Months	795	360
Greater Than Twelve Months	760	886
Total	1,555	1,246
Gross Unrealized Losses
Less Than or Equal to Twelve Months	76	20
Greater Than Twelve Months	144	177
Total	220	197
CMBS
Fair Value
Less Than or Equal to Twelve Months	579	583
Greater Than Twelve Months	777	589
Total	1,356	1,172
Gross Unrealized Losses
Less Than or Equal to Twelve Months	50	56
Greater Than Twelve Months	106	147
Total	156	203
ABS
Fair Value
Less Than or Equal to Twelve Months	2,907	1,900
Greater Than Twelve Months	3,827	7,217
Total	6,734	9,117
Gross Unrealized Losses
Less Than or Equal to Twelve Months	118	68
Greater Than Twelve Months	303	517
Total	421	585
Hybrid and redeemable preferred securities
Fair Value
Less Than or Equal to Twelve Months	23	32
Greater Than Twelve Months	93	95
Total	116	127
Gross Unrealized Losses
Less Than or Equal to Twelve Months	3	3
Greater Than Twelve Months	8	14
Total	$ 11	$ 17