Impairments and Other Charges (Details) - USD ($)	3 Months Ended					9 Months Ended
	Sep. 30, 2020		Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Decline in WTI oil spot price [Member]	28.00%
Decline in US land rig count	35.00%
Decline in International average rig count	12.00%
Long-lived asset impairments	$ 31,000,000					$ 2,299,000,000		$ 150,000,000
Severance costs	83,000,000					356,000,000		77,000,000
Other	8,000,000					193,000,000		48,000,000
Impairments and other charges	133,000,000	[1]			$ 0	3,353,000,000	[1]	308,000,000	[1]
Inventory write-downs	11,000,000					505,000,000		33,000,000
Goodwill, Impairment Loss			$ 0	$ 0
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
WTI oil spot price				63
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
WTI oil spot price				$ 21
Arithmetic Average [Member]
Restructuring Cost and Reserve [Line Items]
WTI oil spot price	41
Drilling And Evaluation [Member]
Restructuring Cost and Reserve [Line Items]
Impairments and other charges	40,000,000					1,200,000,000		153,000,000
Completion And Production [Member]
Restructuring Cost and Reserve [Line Items]
Impairments and other charges	$ 90,000,000,000					$ 2,100,000,000		$ 127,000,000

[1] For the three months ended September 30, 2020, amount includes approximately $90 million attributable to Completion and Production, $40 million attributable to Drilling and Evaluation, and $3 million attributable to Corporate and other. For the nine months ended September 30, 2020, amount includes $2.1 billion attributable to Completion and Production, $1.2 billion attributable to Drilling and Evaluation, and $44 million attributable to Corporate and other. For the nine months ended September 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. There were no impairments and other charges recorded during the three months ended September 30, 2019.