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Lease Commitments - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Lessee, Lease, Description [Line Items] |  |
Operating lease assets | $ 1,196 | $ 1,411
Finance lease agreement | 325 |
Offshore and onshore drilling rigs |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease assets | 56 |
Compressors |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease assets | 155 |
Storage facilities |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease assets | 297 |
Office space |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease assets | 417 |
Other field equipment |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease assets | $ 58 |
Oil and gas exploration and development equipment | Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Contract expiration term | 2 years |
Oil and gas exploration and development equipment | Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Contract expiration term | 8 years |
Pipelines, rail cars, storage facilities, easements and real estate |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease assets | $ 262 |
Real estate leases | Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Contract expiration term | 1 year |
Real estate leases | Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Contract expiration term | 13 years |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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