Future Policy Benefits - Schedule of Gross Premium Income and Interest Expense (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	$ 1,340	$ 1,319
Interest expense	242	149
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	84	94
Interest expense	28	28
Immediate Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	16	18
Interest expense	46	42
PRT
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	1,240	1,207
Interest expense	$ 168	$ 79