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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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- Definition 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. + 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=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=121548190&loc=d3e32787-111569 + Details
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