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Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,331		$ 3,924
Losses on oil, natural gas and NGL derivatives	(132)		(500)
Revenues	2,418	$ 1,943	7,162	$ 6,977
Marcellus [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	184		646
Haynesville [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	195		605
Eagle Ford [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	493		1,411
Utica [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	266		718
Mid-Continent [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	85		301
Powder River Basin [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	108		243
Oil [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	594		1,698
Losses on oil, natural gas and NGL derivatives	(100)		(388)
Oil [Member] \| Marcellus [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0		0
Oil [Member] \| Haynesville [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0		2
Oil [Member] \| Eagle Ford [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	399		1,148
Oil [Member] \| Utica [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	59		179
Oil [Member] \| Mid-Continent [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	58		196
Oil [Member] \| Powder River Basin [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	78		173
Natural gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	578		1,822
Losses on oil, natural gas and NGL derivatives	(18)		(85)
Natural gas [Member] \| Marcellus [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	184		646
Natural gas [Member] \| Haynesville [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	195		603
Natural gas [Member] \| Eagle Ford [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	36		120
Natural gas [Member] \| Utica [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	131		350
Natural gas [Member] \| Mid-Continent [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15		63
Natural gas [Member] \| Powder River Basin [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17		40
NGL [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	159		404
Losses on oil, natural gas and NGL derivatives	(14)		(27)
NGL [Member] \| Marcellus [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0		0
NGL [Member] \| Haynesville [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0		0
NGL [Member] \| Eagle Ford [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	58		143
NGL [Member] \| Utica [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	76		189
NGL [Member] \| Mid-Continent [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12		42
NGL [Member] \| Powder River Basin [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13		30
Oil, natrual gas and NGL [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,199	979	3,424	3,727
Oil, natrual gas and NGL [Member] \| Oil [Member]
Disaggregation of Revenue [Line Items]
Revenues	494		1,310
Oil, natrual gas and NGL [Member] \| Natural gas [Member]
Disaggregation of Revenue [Line Items]
Revenues	560		1,737
Oil, natrual gas and NGL [Member] \| NGL [Member]
Disaggregation of Revenue [Line Items]
Revenues	145		377
Marketing [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,030		3,182
Revenues	1,219	$ 964	3,738	$ 3,250
Marketing [Member] \| Oil [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	707		2,125
Revenues	826		2,506
Marketing [Member] \| Natural gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	211		733
Revenues	281		908
Marketing [Member] \| NGL [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	112		324
Revenues	112		324
Other marketing revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	189		556
Other marketing revenue [Member] \| Oil [Member]
Disaggregation of Revenue [Line Items]
Revenues	119		381
Other marketing revenue [Member] \| Natural gas [Member]
Disaggregation of Revenue [Line Items]
Revenues	70		175
Other marketing revenue [Member] \| NGL [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 0		$ 0