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Asset Retirement Obligations and Accrued Environmental Costs (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Environmental Liabilities [Line Items] |  |  |  |
Asset retirement obligations |  | $ 6,206 | $ 7,908 | $ 7,798
Accrued environmental costs |  | 171 | 178 |
Total asset retirement obligations and accrued environmental costs |  | 6,377 | 8,086 |
Asset retirement obligations and accrued environmental costs due within one year | [1] | 1,025 | 398 |
Long-term asset retirement obligations and accrued environmental costs |  | 5,352 | $ 7,688 |
Other accruals |  |  |  |
Environmental Liabilities [Line Items] |  |  |  |
Asset retirement obligations and accrued environmental costs due within one year |  | $ (741) |  |
[1] | *Classified as a current liability on the balance sheet under “Other accruals.” $ 741 million relates to assets which are held for sale as of December 31, 2019. For additional information see Note 5—Asset Acquisitions and Dispositions.

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- Definition The total carrying amount of a liability (ST & LT) for an asset retirement obligation including the undiscounted amount of the accrual for environmental loss contingencies. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References No definition available. + Details
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- Definition The carrying amount of a long term liability for an asset retirement obligation including the undiscounted amount of the accrual for environmental loss contingencies. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation including the undiscounted amount of the accrual for environmental loss contingencies. due within one year. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References No definition available. + Details
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- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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