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Lease Commitments - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Lessee, Lease, Description [Line Items] |  |
Operating lease assets | $ 1,129 | $ 1,411
Operating lease liabilities | 1,160 |
Finance lease agreement | 335 |
Offshore and onshore drilling rigs |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease assets | 47 |
Compressors |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease assets | 133 |
Storage facilities |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease assets | 342 |
Office space |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease assets | 348 |
Other field equipment |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease assets | $ 71 |
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 | $ 219 |
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 |
Oil and gas exploration and development equipment, real estate offices, compressors, and field equipment |  |
Lessee, Lease, Description [Line Items] |  |
Finance lease agreement | $ 335 |

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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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