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Reserves for Future Policy Benefits (Details) - Annuitization Benefit - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Beginning Balance	$ 713	$ 322
Incurred	10	27
Paid	25	24
Change in unrealized investment gains and losses	(42)	(9)
Ending Balance	656	316
Movement in Liabilities for Guarantees on Long-Duration Contracts, Reinsurance Recoverable [Roll Forward]
Beginning Balance	26	28
Incurred	10	(6)
Paid	1	0
Ending Balance	$ 35	$ 22

X

- Definition

Liabilities for Guarantees on Long-Duration Contracts, Reinsurance Recoverable, Incurred Benefits, Net

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Liabilities for Guarantees on Long-Duration Contracts, Reinsurance Recoverables, Payment for Benefits, Net

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Movement in Liabilities for Guarantees on Long-Duration Contracts, Reinsurance Recoverable [Roll Forward]

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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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Amount of guaranteed minimum benefits the ceding insurer expects to recover on insurance policies ceded to other insurance entities as of the balance sheet date.

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