Long-Lived Asset Impairments Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
	Jul. 31, 2014	Sep. 30, 2016	Dec. 31, 2014	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges		$ 436
Long-Lived Asset Impairments and Other Charges			$ 352		$ 436	$ 638	$ 495
Long-Lived Asset Impairments, Write-Downs and Other Charges					$ 1,043	768	$ 495
Tangible Asset Impairment Charges		388
Impairment of Intangible Assets (Excluding Goodwill)		48
North America [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges		235
Impairment of Intangible Assets (Excluding Goodwill)				$ 35
Drilling Rigs [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Long-Lived Asset Impairments and Other Charges						255
Tangible Asset Impairment Charges		16
Middle East/North Africa/Asia [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges		109
Europe/Sub-Sahara Africa/Russia [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges		12
Impairment of Intangible Assets (Excluding Goodwill)		13
Drilling Tools, Pressure Pumping and Wireline [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Long-Lived Asset Impairments and Other Charges						259
Latin America [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges		$ 16
Land Drilling and Workover Rig Operations [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Long-Lived Asset Impairments, Write-Downs and Other Charges	$ 143
Pressure Pumping [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Long-Lived Asset Impairments and Other Charges						$ 124