Future Policy Benefits - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Long-term care insurance
Liability for Future Policy Benefit, Activity [Line Items]
Liability for future policy benefit cumulative increase (decrease) from cash flow change	$ (17)	$ 286
Liability for future policy benefit cumulative increase (decrease) of actual variance from expected experience	36	368
Net insurance recoveries	23
Gain on reinsurance recapture		26
Life insurance
Liability for Future Policy Benefit, Activity [Line Items]
Liability for future policy benefit cumulative increase (decrease) of actual variance from expected experience	20	32
Liability for future policy benefit adverse development expenses	$ 1
Net premium ratio capped (as percent)	100.00%
Fixed annuities
Liability for Future Policy Benefit, Activity [Line Items]
Liability for future policy benefit cumulative increase (decrease) of actual variance from expected experience	$ (28)	$ (66)