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Future Policy Benefits - Gross Premium Income and Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	$ 620	$ 301
Interest expense	73	48
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	28	32
Interest expense	10	9
Immediate Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	8	6
Interest expense	14	16
PRT
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	584	263
Interest expense	$ 49	$ 23

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