Other Expense (Schedule of Components of Other Expense) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
South Texas deficiency fee obligation		$ 0	$ 0	$ 69	$ 0
Idle drilling and well service equipment expense		44	8	53	12
Loss on early extinguishment of debt	$ 23	27	0	27	0
Transportation commitment charges		5	23	8	63
Legal and environmental charges		2	2	5	8
Restructuring charges		1	146	1	158
Asset impairment		0	2	1	31
Accelerated depreciation		0	0	0	23
Vertical integration services (income) loss, net		5	(1)	1	19
Asset divestiture-related charges (Note 3)		0	23	0	23
Other		6	8	10	21
Other expense		90	211	175	358
Gross revenues		14	28	25	63
Gross costs and expenses		$ 19	27	26	82
Employee severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges				1	$ 156
Sand mine
Restructuring Cost and Reserve [Line Items]
Accelerated depreciation			12	$ 23
Pressure pumping assets
Restructuring Cost and Reserve [Line Items]
Accelerated depreciation			$ 13