Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Revenue related to midstream and downstream gas activities. May include the following: gathering from wells, processing to remove impurities, storage, transmission, and the sale of natural gas and related products.

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Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,360
Gains (losses) on oil, natural gas and NGL derivatives	(117)
Oil, natural gas and NGL	1,243	$ 1,469
Marketing	1,246	$ 1,284
Marcellus [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	294
Haynesville [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	210
Eagle Ford [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	446
Utica [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	228
Mid-Continent [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	122
Powder River Basin [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	60
Oil [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	537
Gains (losses) on oil, natural gas and NGL derivatives	(86)
Oil, natural gas and NGL	451
Marketing	803
Oil [Member] \| Marcellus [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Oil [Member] \| Haynesville [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Oil [Member] \| Eagle Ford [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	364
Oil [Member] \| Utica [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	60
Oil [Member] \| Mid-Continent [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	73
Oil [Member] \| Powder River Basin [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	40
Natural gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	706
Gains (losses) on oil, natural gas and NGL derivatives	(32)
Oil, natural gas and NGL	674
Marketing	333
Natural gas [Member] \| Marcellus [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	294
Natural gas [Member] \| Haynesville [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	210
Natural gas [Member] \| Eagle Ford [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	42
Natural gas [Member] \| Utica [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	116
Natural gas [Member] \| Mid-Continent [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	32
Natural gas [Member] \| Powder River Basin [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12
NGL [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	117
Gains (losses) on oil, natural gas and NGL derivatives	1
Oil, natural gas and NGL	118
Marketing	110
NGL [Member] \| Marcellus [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
NGL [Member] \| Haynesville [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
NGL [Member] \| Eagle Ford [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	40
NGL [Member] \| Utica [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52
NGL [Member] \| Mid-Continent [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17
NGL [Member] \| Powder River Basin [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8
Marketing Revenue [Member]
Disaggregation of Revenue [Line Items]
Marketing	1,089
Marketing Revenue [Member] \| Oil [Member]
Disaggregation of Revenue [Line Items]
Marketing	686
Marketing Revenue [Member] \| Natural gas [Member]
Disaggregation of Revenue [Line Items]
Marketing	293
Marketing Revenue [Member] \| NGL [Member]
Disaggregation of Revenue [Line Items]
Marketing	110
Other Marketing Revenue [Member]
Disaggregation of Revenue [Line Items]
Marketing	157
Other Marketing Revenue [Member] \| Oil [Member]
Disaggregation of Revenue [Line Items]
Marketing	117
Other Marketing Revenue [Member] \| Natural gas [Member]
Disaggregation of Revenue [Line Items]
Marketing	40
Other Marketing Revenue [Member] \| NGL [Member]
Disaggregation of Revenue [Line Items]
Marketing	$ 0