Investments - Fair Value and Gross Unrealized Losses in a Continuous Unrealized Loss Position (Details) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2026 USD ($) security	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) security
Fair Value
Less Than or Equal to Twelve Months	$ 26,462		$ 13,038
Greater Than Twelve Months	34,471		36,491
Total	60,933		49,529
Gross Unrealized Losses
Less Than or Equal to Twelve Months	1,556		1,325
Greater Than Twelve Months	5,437		4,939
Total	$ 6,993		$ 6,264
Total number of fixed maturity AFS securities in an unrealized loss position | security	7,002		5,738
Unrealized holding losses arising during the period	$ 4	$ 12
Corporate bonds
Fair Value
Less Than or Equal to Twelve Months	15,612		$ 8,529
Greater Than Twelve Months	28,813		30,458
Total	44,425		38,987
Gross Unrealized Losses
Less Than or Equal to Twelve Months	1,403		1,225
Greater Than Twelve Months	4,792		4,315
Total	6,195		5,540
U.S. government bonds
Fair Value
Less Than or Equal to Twelve Months	546		427
Greater Than Twelve Months	36		36
Total	582		463
Gross Unrealized Losses
Less Than or Equal to Twelve Months	31		27
Greater Than Twelve Months	5		5
Total	36		32
State and municipal bonds
Fair Value
Less Than or Equal to Twelve Months	257		143
Greater Than Twelve Months	919		944
Total	1,176		1,087
Gross Unrealized Losses
Less Than or Equal to Twelve Months	19		26
Greater Than Twelve Months	216		205
Total	235		231
Foreign government bonds
Fair Value
Less Than or Equal to Twelve Months	8		6
Greater Than Twelve Months	122		135
Total	130		141
Gross Unrealized Losses
Less Than or Equal to Twelve Months	1		1
Greater Than Twelve Months	52		49
Total	53		50
RMBS
Fair Value
Less Than or Equal to Twelve Months	401		154
Greater Than Twelve Months	732		803
Total	1,133		957
Gross Unrealized Losses
Less Than or Equal to Twelve Months	11		7
Greater Than Twelve Months	107		101
Total	118		108
CMBS
Fair Value
Less Than or Equal to Twelve Months	893		408
Greater Than Twelve Months	940		956
Total	1,833		1,364
Gross Unrealized Losses
Less Than or Equal to Twelve Months	15		8
Greater Than Twelve Months	85		79
Total	100		87
ABS
Fair Value
Less Than or Equal to Twelve Months	8,706		3,354
Greater Than Twelve Months	2,855		3,105
Total	11,561		6,459
Gross Unrealized Losses
Less Than or Equal to Twelve Months	75		30
Greater Than Twelve Months	174		180
Total	249		210
Hybrid and redeemable preferred securities
Fair Value
Less Than or Equal to Twelve Months	39		17
Greater Than Twelve Months	54		54
Total	93		71
Gross Unrealized Losses
Less Than or Equal to Twelve Months	1		1
Greater Than Twelve Months	6		5
Total	$ 7		$ 6