Long-duration Contracts - Premium Reconciliation (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Premiums	$ 9,163	$ 10,769
Payout annuities with life contingencies
Liability for Future Policy Benefit, Activity [Line Items]
Premiums	9,142	10,745
Reconciling items
Liability for Future Policy Benefit, Activity [Line Items]
Premiums	$ 21	$ 24