Income Taxes (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	May 26, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2016
(Provision) Benefit for Income Taxes		$ 102	$ 132	$ 203	$ 132
Income (Loss) Before Income Taxes		(664)	(615)	(1,256)	(722)	$ (1,260)
Litigation Settlement, Amount	$ 150		(112)		(112)
Gain (Loss) Related to Litigation Settlement		(75)		(140)
Bond Tender Premium, Net		(78)	0	(78)	0
Financing Receivable, Allowance for Credit Losses, Write-downs		84
Foreign Exchange Related Charges		0	16	31	42
Equity Investment Impairment		0	20	0	20
Restructuring Charges		51	69	$ 128	110
Scenario, Forecast
Uncertain tax positions, estimated for next twelve months							$ 42
IRAQ
Loss on Contracts		$ (52)	69		27
2015 Plan [Member]
Restructuring Charges			$ 69		$ 110