Quarterly Financial Data (Unaudited) Narrative (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Other Nonrecurring (Income) Expense	$ 245	$ 771	$ 347	$ 285						$ 11	$ 5
Restructuring Charges								$ 59	$ 280	232	331
Impairment, Restructuring Charges, Supply Contracts & Inventory Write Down					$ 668	$ 77	$ 395
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount									137	265	0
Inventory Write-down					(217)				$ (252)	(186)	(113)
IRAQ
Loss Contingencies [Line Items]
Loss on Contracts					$ 82	$ 44	$ 69	$ 42		$ 153	$ 72