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Impairments - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) compressor | Dec. 31, 2018 USD ($)
Asset Impairment Charges [Abstract] |  |  |
Future commodity prices escalated by an inflationary rate, period | 2 years |  |
Property, Plant and Equipment [Line Items] |  |  |
Total impairments of oil and natural gas properties | $ 8,446 | $ 8 | $ 78
Asset impairment | $ 89 | 3 | 53
Oil and Gas Properties |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Rate used to discount expected future net cash flows | 11.00% |  |
Total impairments of oil and natural gas properties | $ 8,446 |  |
Sand mine |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment | 76 | 0 | 0
Compressor |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment | $ 13 | 0 | $ 45
Natural gas compressors, difference between carrying value and fair value |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment |  | $ 45 |
Equipment, number of units | compressor |  | 890 |

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