Other Insurance Liabilities and Separate Accounts - Changes in Liability for Future Policy Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Present value of expected future policy benefits
Effect of changes in discount rate assumptions	$ (20)	$ (1)	$ (23)
Large Case Pensions
Present value of expected future policy benefits
Liability for future policy benefits, beginning of period - current discount rate	1,917	2,139
Beginning liability for future policy benefits at original (locked-in) discount rate	2,090	2,251
Effect of changes in cash flow assumptions		0	0
Effect of actual variances from expected experience		(6)	(27)
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate		2,084	2,224
Issuances	18	30
Interest accrual (using locked-in discount rate)	84	91
Benefit payments (actual)	(241)	(255)
Ending liability for future policy benefits at original (locked-in) discount rate	1,945	2,090
Effect of changes in discount rate assumptions	(120)	(173)
Liability for future policy benefits, end of period - current discount rate	1,825	1,917
Net liability for future policy benefits	1,825	1,917
Less: Reinsurance recoverable	0	0
Net liability for future policy benefits, net of reinsurance recoverable	1,825	1,917
Long-Term Care
Present value of expected net premiums
Liability for future policy benefits, beginning of period - current discount rate	275	293
Beginning liability for future policy benefits at original (locked-in) discount rate	280	288
Effect of changes in cash flow assumptions		0	0
Effect of actual variances from expected experience		7	16
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate		287	304
Interest accrual (using locked-in discount rate)	14	14
Net premiums (actual)	(37)	(38)
Ending liability for future policy benefits at original (locked-in) discount rate	264	280
Effect of changes in discount rate assumptions	2	(5)
Liability for future policy benefits, end of period - current discount rate	266	275
Present value of expected future policy benefits
Liability for future policy benefits, beginning of period - current discount rate	1,552	1,640
Beginning liability for future policy benefits at original (locked-in) discount rate	1,647	1,632
Effect of changes in cash flow assumptions		0	0
Effect of actual variances from expected experience		3	6
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate		1,650	$ 1,638
Issuances	0	0
Interest accrual (using locked-in discount rate)	82	83
Benefit payments (actual)	(78)	(74)
Ending liability for future policy benefits at original (locked-in) discount rate	1,654	1,647
Effect of changes in discount rate assumptions	(58)	(95)
Liability for future policy benefits, end of period - current discount rate	1,596	1,552
Net liability for future policy benefits	1,330	1,277
Less: Reinsurance recoverable	0	0
Net liability for future policy benefits, net of reinsurance recoverable	$ 1,330	$ 1,277