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Long-duration Contracts - Premium Reconciliation (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Premiums	$ 9,137	$ 7,724
Payout annuities with life contingencies
Liability for Future Policy Benefit, Activity [Line Items]
Premiums	9,123	7,708
Reconciling items
Liability for Future Policy Benefit, Activity [Line Items]
Premiums	$ 14	$ 16

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