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Future Policy Benefits - Schedule of Gross Premium Income and Interest Expense (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Liability for Future Policy Benefit, Activity
Gross premium income	$ 1,370	$ 1,340
Interest expense	305	242
Traditional Life
Liability for Future Policy Benefit, Activity
Gross premium income	75	84
Interest expense	27	28
Immediate annuities
Liability for Future Policy Benefit, Activity
Gross premium income	16	16
Interest expense	40	46
PRT
Liability for Future Policy Benefit, Activity
Gross premium income	1,279	1,240
Interest expense	$ 238	$ 168

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