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Revenues - Revenues from Contracts with Customers by Product Type and Geographic Areas (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 761 $ 1,249 $ 2,275 $ 3,830
United States E&P        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 722 1,172 2,154 3,434
United States E&P | Eagle Ford        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 231 388 758 1,190
United States E&P | Bakken        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 254 466 757 1,334
United States E&P | Oklahoma        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 126 181 329 503
United States E&P | Northern Delaware        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 66 96 187 259
United States E&P | Other U.S.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 45 41 123 148
United States E&P | Crude oil and condensate        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 552 1,017 1,741 2,897
United States E&P | Crude oil and condensate | Eagle Ford        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 190 336 639 1,004
United States E&P | Crude oil and condensate | Bakken        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 230 452 707 1,277
United States E&P | Crude oil and condensate | Oklahoma        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 65 116 181 304
United States E&P | Crude oil and condensate | Northern Delaware        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 53 88 160 229
United States E&P | Crude oil and condensate | Other U.S.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 14 25 54 83
United States E&P | Natural gas liquids        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 73 64 161 225
United States E&P | Natural gas liquids | Eagle Ford        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 22 23 53 88
United States E&P | Natural gas liquids | Bakken        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 15 6 28 31
United States E&P | Natural gas liquids | Oklahoma        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 28 28 62 81
United States E&P | Natural gas liquids | Northern Delaware        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 7 5 14 20
United States E&P | Natural gas liquids | Other U.S.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1 2 4 5
United States E&P | Natural gas        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 69 81 190 263
United States E&P | Natural gas | Eagle Ford        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 18 28 62 94
United States E&P | Natural gas | Bakken        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 9 8 22 26
United States E&P | Natural gas | Oklahoma        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 33 37 86 118
United States E&P | Natural gas | Northern Delaware        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 6 3 13 10
United States E&P | Natural gas | Other U.S.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 3 5 7 15
United States E&P | Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 28 10 62 49
United States E&P | Other | Eagle Ford        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1 1 4 4
United States E&P | Other | Bakken        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
United States E&P | Other | Oklahoma        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
United States E&P | Other | Northern Delaware        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
United States E&P | Other | Other U.S.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 27 9 58 45
International E&P        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       396
International E&P | E.G.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 39 77 121 243
International E&P | U.K.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       134
International E&P | Other Int’l        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       19
International E&P | Crude oil and condensate        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       341
International E&P | Crude oil and condensate | E.G.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 31 67 96 215
International E&P | Crude oil and condensate | U.K.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       107
International E&P | Crude oil and condensate | Other Int’l        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       19
International E&P | Natural gas liquids        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       4
International E&P | Natural gas liquids | E.G.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1 1 3 3
International E&P | Natural gas liquids | U.K.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       1
International E&P | Natural gas liquids | Other Int’l        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       0
International E&P | Natural gas        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       36
International E&P | Natural gas | E.G.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 7 8 $ 22 24
International E&P | Natural gas | U.K.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       12
International E&P | Natural gas | Other Int’l        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       0
International E&P | Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       15
International E&P | Other | E.G.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 0 $ 1   1
International E&P | Other | U.K.        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       14
International E&P | Other | Other Int’l        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers       $ 0