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Impairments - Narrative (Details)
$ in Millions
12 Months Ended
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