Impairment and Other Charges (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Long-lived asset impairments			$ 1,603
Inventory costs and write-downs			458
Severance			172
Joint ventures			154
Other			119
Total impairments and other charges	[1]		$ 2,506	$ 265	$ 647
North America land rig count decline during 2019			26.00%
North America land rig count decline in Q4 2019		9.00%
Impairments and other charges			$ 2,506	265	647
Impairment of hydraulic fracturing equipment			759
Impairment of legacy drilling equipment			243
Impairment of real estate facilities			215
Impairment of right-of-use assets associated with operating leases			139
Impairment of intangible assets			98
Impairment of other fixed assets			148
Completion and Production
Restructuring Cost and Reserve [Line Items]
Impairments and other charges			1,600
Drilling and Evaluation
Restructuring Cost and Reserve [Line Items]
Impairments and other charges			$ 849
VENEZUELA
Restructuring Cost and Reserve [Line Items]
Venezuela investment write-down				265	647
Total impairments and other charges	[1]			$ 265	$ 647

[1] Impairments and other charges are as follows: -For the year ended December 31, 2019, amount includes approximately $1.6 billion attributable to Completion and Production, $849 million attributable to Drilling and Evaluation, and $56 million attributable to Corporate and other. -For the years ended December 31, 2018 and December 31, 2017, we recorded aggregate charges of $265 million and $647 million, respectively, to write-down our investment in Venezuela.