Impairment and Restructuring Charges - (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) Employee	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Severance			$ 81
Loss on firm purchase commitment	$ 51
Restructuring Costs	42	$ 573
Restructuring reserve, contract termination			$ 26
Inventory Write-down		171
Inventory Write Down-Cost of Sales		29
Inventory Write Down-Cost of Services		142
Impairment of assets	118	240
Workforce reductions
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 47	247
Restructuring and Related Cost, Number of Positions Eliminated | Employee	2,000
Payments for Restructuring	$ 77
Contract terminations
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs	0	86
Payments for Restructuring	16
Impairment of buildings and improvements
Restructuring Cost and Reserve [Line Items]
Impairment of Long-Lived Assets Held-for-use	(5)	77
Impairment of machinery and equipment
Restructuring Cost and Reserve [Line Items]
Impairment of Long-Lived Assets Held-for-use	0	$ 163
Machinery and Equipment [Member]
Restructuring Cost and Reserve [Line Items]
Carrying Amount of Impaired Long-Lived Assets, Held-for-use	203
Impairment of Long-Lived Assets Held-for-use	106
Customer Relationships and Trade Names [Member]
Restructuring Cost and Reserve [Line Items]
Carrying Amount of Intangible Assets, Finite-Lived	29
Impairment of Intangible Assets, Finite-lived	$ 12
Russia Caspian [Member]
Restructuring Cost and Reserve [Line Items]
Fair Value Assumptions, Weighted Average Cost of Capital	15.00%
Asia Pacific [Member]
Restructuring Cost and Reserve [Line Items]
Fair Value Assumptions, Weighted Average Cost of Capital	13.50%