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Derivative Instruments (Details) kr in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 NOK (kr)	Dec. 31, 2018 NOK (kr)	Jan. 30, 2018 USD ($)
Forward exchange contracts
Derivatives
Exchange rate (as a percent)	8.90	7.94	8.90	7.94
Fair value adjustments to derivatives	$ (3)	$ (10)
Derivative instruments, assets	1
Derivative instruments, liabilities		6
Forward exchange contracts | Pay
Derivatives
Aggregate notional amount	$ 46	76
Forward exchange contracts | Receive
Derivatives
Aggregate notional amount | kr			kr 405	kr 600
Interest rate swaps | Songa
Derivatives
Fair value adjustments to derivatives		4
Derivative instruments, assets					$ 14
Cash proceeds from termination of derivatives		18
Currency swaps | Songa
Derivatives
Derivative instruments, liabilities					$ 81
Cash payment for termination of derivatives		92
Loss associated with derivative sale		$ (11)

X

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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X

- Definition

Contractual rate at which a foreign currency can be purchased or sold.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal or face amount used to calculate payment on derivative.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

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The cash inflow from a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

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