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Revenue Recognition - Disaggregated Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Revenues $ 1,230 $ 1,360
Gains (losses) on oil, natural gas and NGL derivatives (301) (117)
Gains on sales of assets 19 19 [1],[2]
Revenues 2,196 2,524 [1]
Oil, natural gas and NGL    
Disaggregation of Revenue [Line Items]    
Revenues 929 1,243 [1]
Marketing    
Disaggregation of Revenue [Line Items]    
Revenues 1,143 1,089
Gains (losses) on oil, natural gas and NGL derivatives (2)  
Revenues 1,233 1,246 [1]
Other marketing revenue    
Disaggregation of Revenue [Line Items]    
Revenues 92 157
Other    
Disaggregation of Revenue [Line Items]    
Revenues 15 16 [1]
Marcellus    
Disaggregation of Revenue [Line Items]    
Revenues 302 294
Haynesville    
Disaggregation of Revenue [Line Items]    
Revenues 201 210
Eagle Ford    
Disaggregation of Revenue [Line Items]    
Revenues 425 446
Brazos Valley    
Disaggregation of Revenue [Line Items]    
Revenues 127  
Powder River Basin    
Disaggregation of Revenue [Line Items]    
Revenues 109 60
Mid-Continent    
Disaggregation of Revenue [Line Items]    
Revenues 66 122
Utica    
Disaggregation of Revenue [Line Items]    
Revenues   228
Oil    
Disaggregation of Revenue [Line Items]    
Revenues 566 537
Gains (losses) on oil, natural gas and NGL derivatives (259) (86)
Oil | Oil, natural gas and NGL    
Disaggregation of Revenue [Line Items]    
Revenues 307 451
Oil | Marketing    
Disaggregation of Revenue [Line Items]    
Revenues 613 686
Gains (losses) on oil, natural gas and NGL derivatives 0  
Revenues 685 803
Oil | Other marketing revenue    
Disaggregation of Revenue [Line Items]    
Revenues 72 117
Oil | Marcellus    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Oil | Haynesville    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Oil | Eagle Ford    
Disaggregation of Revenue [Line Items]    
Revenues 331 364
Oil | Brazos Valley    
Disaggregation of Revenue [Line Items]    
Revenues 121  
Oil | Powder River Basin    
Disaggregation of Revenue [Line Items]    
Revenues 74 40
Oil | Mid-Continent    
Disaggregation of Revenue [Line Items]    
Revenues 40 73
Oil | Utica    
Disaggregation of Revenue [Line Items]    
Revenues   60
Natural Gas    
Disaggregation of Revenue [Line Items]    
Revenues 595 706
Gains (losses) on oil, natural gas and NGL derivatives (42) (32)
Natural Gas | Oil, natural gas and NGL    
Disaggregation of Revenue [Line Items]    
Revenues 553 674
Natural Gas | Marketing    
Disaggregation of Revenue [Line Items]    
Revenues 413 293
Gains (losses) on oil, natural gas and NGL derivatives (2)  
Revenues 431 333
Natural Gas | Other marketing revenue    
Disaggregation of Revenue [Line Items]    
Revenues 20 40
Natural Gas | Marcellus    
Disaggregation of Revenue [Line Items]    
Revenues 302 294
Natural Gas | Haynesville    
Disaggregation of Revenue [Line Items]    
Revenues 201 210
Natural Gas | Eagle Ford    
Disaggregation of Revenue [Line Items]    
Revenues 48 42
Natural Gas | Brazos Valley    
Disaggregation of Revenue [Line Items]    
Revenues 4  
Natural Gas | Powder River Basin    
Disaggregation of Revenue [Line Items]    
Revenues 25 12
Natural Gas | Mid-Continent    
Disaggregation of Revenue [Line Items]    
Revenues 15 32
Natural Gas | Utica    
Disaggregation of Revenue [Line Items]    
Revenues   116
NGL    
Disaggregation of Revenue [Line Items]    
Revenues 69 117
Gains (losses) on oil, natural gas and NGL derivatives 0 1
NGL | Oil, natural gas and NGL    
Disaggregation of Revenue [Line Items]    
Revenues 69 118
NGL | Marketing    
Disaggregation of Revenue [Line Items]    
Revenues 117 110
Gains (losses) on oil, natural gas and NGL derivatives 0  
Revenues 117 110
NGL | Other marketing revenue    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
NGL | Marcellus    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
NGL | Haynesville    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
NGL | Eagle Ford    
Disaggregation of Revenue [Line Items]    
Revenues 46 40
NGL | Brazos Valley    
Disaggregation of Revenue [Line Items]    
Revenues 2  
NGL | Powder River Basin    
Disaggregation of Revenue [Line Items]    
Revenues 10 8
NGL | Mid-Continent    
Disaggregation of Revenue [Line Items]    
Revenues $ 11 17
NGL | Utica    
Disaggregation of Revenue [Line Items]    
Revenues   $ 52
[1] Financial information for 2018 has been recast to reflect the retrospective application of the successful efforts method of accounting. See Note 1.
[2] Financial information for 2018 has been recast to reflect the retrospective application of the successful efforts method of accounting. See Note 1.