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Acquisition (Details) - Alaska Segment [Member] - Operating Segments [Member] - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2018	Jul. 31, 2018
Interest In WNS Assets and Alpine Pipeline [Member]
Business Acquisition [Line Items]
Costs Incurred, Acquisition of Oil and Gas Properties	$ 386
Percent Acquired	22.00%
Interest In Greater Kuparuk Area [Member] | Scenario Plan [Member]
Business Acquisition [Line Items]
Percent Acquired		39.20%
Interest In Kuparuk Transportation Co [Member] | Scenario Plan [Member]
Business Acquisition [Line Items]
Percent Acquired		38.00%

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- Definition

Percent of asset ownership acquired.

+ References

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- Definition

Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 18
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62014-109447

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