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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 |  |  |  |  |

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- 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 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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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 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3581-108585 + Details
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