Long-Lived Asset Impairments Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges	$ 436	$ 0	$ 436
Long-Lived Asset Impairments		$ 0	$ 436
Impairment of Intangible Assets (Excluding Goodwill)	48
Tangible Asset Impairment Charges	388
Latin America
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges	16
Europe/ SSA/ Russia
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	13
Tangible Asset Impairment Charges	12
MENA/ Asia Pacific
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges	109
North America
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	35
Tangible Asset Impairment Charges	235
Drilling Rigs
Impaired Long-Lived Assets Held and Used [Line Items]
Tangible Asset Impairment Charges	$ 16