Insurance Liabilities - Rollforward of universal life policies (Details) - Universal Life - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Balance, beginning of year	$ 4,505	$ 4,751	$ 3,794
Incurred guaranteed benefits	740	603	1,034
Paid guaranteed benefits	(588)	(489)	(470)
Changes related to unrealized appreciation (depreciation) of investments	(1,832)	(360)	393
Balance, end of year	$ 2,825	$ 4,505	$ 4,751

Amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, as of the balance sheet date.

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Amount of guaranteed minimum benefit expense incurred for expected guaranteed minimum benefits in excess of projected account values.

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Net amount of other increases or decreases to the liability for guaranteed minimum benefits on long-duration contracts occurring during the period.

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Amount of cash outflow to policyholders and contract holders for guaranteed minimum benefit payments.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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