Impairments and Other Charges (Details) - USD ($)	3 Months Ended					6 Months Ended
	Jun. 30, 2020		Mar. 31, 2020	Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Decline in US land rig count	50.00%
Long-lived asset impairments	$ 1,252,000,000			$ 108,000,000		$ 2,268,000,000	$ 150,000,000
Severance costs	241,000,000			58,000,000		273,000,000	77,000,000
Other	160,000,000			48,000,000		185,000,000	48,000,000
Impairments and other charges	2,147,000,000	[1]		247,000,000	[1]	3,220,000,000	308,000,000
Impairment of hydraulic fracturing equipment	368,000,000
Impairment of drilling equipment	281,000,000
Inventory write-downs	$ 494,000,000			33,000,000		494,000,000	33,000,000
Decline in International average rig count	22.00%
Impairment of well intervention services equipment.	$ 146,000,000
Impairment of right-of-use assets	122,000,000
Impairment of intangible assets	131,000,000
Impairment of other fixed assets	204,000,000
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
WTI oil spot price	(41)		$ (63)
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
WTI oil spot price	37
Drilling And Evaluation [Member]
Restructuring Cost and Reserve [Line Items]
Impairments and other charges	$ 770,000,000			$ 142,000,000		$ 1,000,000,000.0	$ 153,000,000

[1] For the three months ended June 30, 2020, amount includes approximately $1.4 billion attributable to Completion and Production, $770 million attributable to Drilling and Evaluation, and $25 million attributable to Corporate and other. For the three months ended June 30, 2019, amount includes $77 million attributable to Completion and Production, $142 million attributable to Drilling and Evaluation, and $28 million attributable to Corporate and other. For the six months ended June 30, 2020, amount includes $2.1 billion attributable to Completion and Production, $1.0 billion attributable to Drilling and Evaluation, and $41 million attributable to Corporate and other. For the six months ended June 30, 2019, amount includes $127 million attributable to Completion and Production, $153 million attributable to Drilling and Evaluation, and $28 million attributable to Corporate and other. See Note 2 for further discussion on these impairments and other charges.