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Goodwill and Other Intangible Assets - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Mar. 23, 2020 $ / shares
Goodwill and Intangible Assets Disclosure [Abstract]
Number of reportable segments \| segment	4
Number of reportable units \| segment	4
Share price (in dollars per share) \| $ / shares			$ 9.33
Finite-Lived Intangible Assets [Line Items]
Impairment	$ 14,717	$ 0
Amortization expense for intangible assets included in net income	84	$ 96
Oilfield Services
Finite-Lived Intangible Assets [Line Items]
Impairment	11,428
Oilfield Equipment
Finite-Lived Intangible Assets [Line Items]
Impairment	$ 3,289
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	30 years