Impact of Derivative Instruments in Consolidated Balance Sheet Other (Details) - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative Assets		$ 19		$ 11
Derivative Liabilities		15		9
Credit Risk Derivatives, at Fair Value, Net		0		0
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		2
Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		17
Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Liability				5
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Liability				3
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		19	[1]	11	[2]
Derivative Liabilities	[3]	10		1
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		0		0
Derivative Liabilities		5	[3]	8	[4]
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		0		0
Derivative Liabilities		1		0
Not Designated as Hedging Instrument [Member] | Energy Related Derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		0		0
Derivative Liabilities		$ 4		$ 8

[1] Includes $2 million recorded in Other current assets and $17 million recorded in Deferred charges and other assets in the accompanying consolidated balance sheet.

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

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

[4] Includes $5 million recorded in Other accrued liabilities and $3 million recorded in Other liabilities in the accompanying consolidated balance sheet.