Quarterly Financial Data (Unaudited) Narrative (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Severance and Restructuring Charges				$ 59				$ 96	$ 232	$ 331	$ 0
Impairment, Restructuring Charges, Supply Contracts & Inventory Write Down	$ 668	$ 77	$ 395		$ 169	$ 140	$ 345
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount									265	0	0
Inventory Write-down	(217)								(186)	(113)	(62)
Loss (Gain) on Sale of Businesses and Investments, Net					(311)				6	(349)	(24)
Currency Devaluation and Related Charges									85	245	100
Venezuelan Bolivar
Loss Contingencies [Line Items]
Currency Devaluation and Related Charges					245				26
Currency devaluation expense										245	100
IRAQ
Loss Contingencies [Line Items]
Gain on Project				$ 42
Loss on Contracts	$ 82	$ 44	$ 69		$ 34	$ 10	$ 2	$ 26	$ 153	$ 72	$ 232