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Fair Value Measurement - FV Hierarchy (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cenovus Energy	$ 1,835	$ 1,462
Commodity derivative asset, gross	377	450
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cenovus Energy	1,835	1,462
Commodity derivative asset, gross	377	450
Total assets	2,212	1,912
Commodity derivative liability, gross	358	400
Total liabilities	358	400
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cenovus Energy	1,835	1,462
Commodity derivative asset, gross	230	236
Total assets	2,065	1,698
Commodity derivative liability, gross	237	225
Total liabilities	237	225
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cenovus Energy	0	0
Commodity derivative asset, gross	106	181
Total assets	106	181
Commodity derivative liability, gross	111	145
Total liabilities	111	145
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cenovus Energy	0	0
Commodity derivative asset, gross	41	33
Total assets	41	33
Commodity derivative liability, gross	10	30
Total liabilities	$ 10	$ 30

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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+ References

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-Publisher FASB
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-Topic 815
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Fair value of financial and nonfinancial obligations.

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