Impact Of Derivative Instruments In Consolidated Balance Sheet (Details) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Assets		$ 11		$ 3
Derivative Liabilities		9		6
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		11		3
Derivative Liabilities		1		4
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		0		0
Derivative Liabilities		8		2
Energy Related Derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		0		0
Derivative Liabilities		8	[1]	2
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	[2]	11		3
Derivative Liabilities	[1]	$ 1		$ 4

[1] Included in Other accrued liabilities in the accompanying consolidated balance sheet.

[2] Included in Other current assets in the accompanying consolidated balance sheet.