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Derivative Instruments (Details) - Undesignated derivative instruments kr in Millions, $ in Millions	1 Months Ended		3 Months Ended	9 Months Ended
	Jul. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 NOK (kr)	Sep. 30, 2018 USD ($)	Jan. 30, 2018 USD ($)
Forward exchange contracts
Derivatives
Exchange rate (as a percent)					7.96	7.96
Fair value adjustments to derivatives			$ (3)	$ (3)
Derivative instruments, liabilities						$ 2
Derivative instruments, assets							$ 4
Forward exchange contracts | Songa
Derivatives
Fair value adjustments to derivatives				(1)
Forward exchange contracts | Pay
Derivatives
Aggregate notional amount						$ 113
Forward exchange contracts | Receive
Derivatives
Aggregate notional amount | kr					kr 900
Interest rate swaps
Derivatives
Fair value adjustments to derivatives			$ (1)	4
Derivative instruments, assets							14
Cash proceeds from termination of derivatives	$ 18
Currency swaps
Derivatives
Derivative instruments, liabilities							$ 81
Loss associated with termination				$ (11)
Cash payment for termination of derivatives		$ 92

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- 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.

+ References

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-SubTopic 20
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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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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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- Definition

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.

+ References

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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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