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Impairments and Losses and Gains on Divestiture Long-lived Assets (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2020	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Impairments of long-lived and intangible assets			$ 376
Ruby Pipeline Holding Company LLC [Member]
Property, Plant and Equipment [Line Items]
Impairments of equity investments				$ 650
Natural Gas Pipelines
Property, Plant and Equipment [Line Items]
Impairments of equity investments			$ 0	650	$ 270
Impairments of long-lived and intangible assets		$ 600		290
Natural Gas Pipelines | Ruby Pipeline Holding Company LLC [Member]
Property, Plant and Equipment [Line Items]
Impairments of equity investments				$ 650
Oil and Gas Properties [Member] | CO2
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 350
Oil and Gas Properties [Member] | CO2 | Valuation Technique, Discounted Cash Flow [Member]
Property, Plant and Equipment [Line Items]
Estimated Weighted Average Cost Of Capital	10.50%

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Loss (gain) on impairments of long-lived assets

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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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)
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-Publisher FASB
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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 323
-SubTopic 10
-Section 35
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