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Future Policy Benefits - Gross Premium Income and Interest Expense (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	$ 1,319	$ 1,249
Interest expense	149	105
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	94	104
Interest expense	28	29
Immediate Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	18	20
Interest expense	42	45
PRT
Liability for Future Policy Benefit, Activity [Line Items]
Gross premium income	1,207	1,125
Interest expense	$ 79	$ 31

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-Topic 944
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