Investments - Fair Value and Gross Unrealized Losses in a Continuous Unrealized Loss Position (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026 USD ($) security	Dec. 31, 2025 USD ($) security
Fair Value
Less Than or Equal to Twelve Months	$ 34,961	$ 22,143
Greater Than Twelve Months	35,443	37,525
Total	70,404	59,668
Gross Unrealized Losses
Less Than or Equal to Twelve Months	4,024	3,658
Greater Than Twelve Months	5,874	5,341
Total	$ 9,898	$ 8,999
Total number of fixed maturity AFS securities in an unrealized loss position | security	7,330	6,089
Unrealized holding losses arising during the period	$ 5	$ 12
Corporate bonds
Fair Value
Less Than or Equal to Twelve Months	23,311	16,727
Greater Than Twelve Months	29,704	31,404
Total	53,015	48,131
Gross Unrealized Losses
Less Than or Equal to Twelve Months	3,669	3,366
Greater Than Twelve Months	5,204	4,688
Total	8,873	8,054
U.S. government bonds
Fair Value
Less Than or Equal to Twelve Months	558	427
Greater Than Twelve Months	36	36
Total	594	463
Gross Unrealized Losses
Less Than or Equal to Twelve Months	31	27
Greater Than Twelve Months	6	5
Total	37	32
State and municipal bonds
Fair Value
Less Than or Equal to Twelve Months	625	582
Greater Than Twelve Months	965	995
Total	1,590	1,577
Gross Unrealized Losses
Less Than or Equal to Twelve Months	163	166
Greater Than Twelve Months	230	219
Total	393	385
Foreign government bonds
Fair Value
Less Than or Equal to Twelve Months	12	10
Greater Than Twelve Months	122	135
Total	134	145
Gross Unrealized Losses
Less Than or Equal to Twelve Months	2	2
Greater Than Twelve Months	52	49
Total	54	51
RMBS
Fair Value
Less Than or Equal to Twelve Months	569	345
Greater Than Twelve Months	766	838
Total	1,335	1,183
Gross Unrealized Losses
Less Than or Equal to Twelve Months	48	39
Greater Than Twelve Months	117	115
Total	165	154
CMBS
Fair Value
Less Than or Equal to Twelve Months	1,048	577
Greater Than Twelve Months	940	956
Total	1,988	1,533
Gross Unrealized Losses
Less Than or Equal to Twelve Months	28	19
Greater Than Twelve Months	84	80
Total	112	99
ABS
Fair Value
Less Than or Equal to Twelve Months	8,793	3,453
Greater Than Twelve Months	2,856	3,107
Total	11,649	6,560
Gross Unrealized Losses
Less Than or Equal to Twelve Months	81	37
Greater Than Twelve Months	175	180
Total	256	217
Hybrid and redeemable preferred securities
Fair Value
Less Than or Equal to Twelve Months	45	22
Greater Than Twelve Months	54	54
Total	99	76
Gross Unrealized Losses
Less Than or Equal to Twelve Months	2	2
Greater Than Twelve Months	6	5
Total	$ 8	$ 7