Derivatives And Hedging Activities Fair Value of Derivative Instruments in the Balance Sheet (Details) - USD ($)		Dec. 31, 2016	Dec. 31, 2015
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives		$ 36,000,000	$ 4,000,000
Gross amount of recognized liability derivatives		73,000,000	130,000,000
Designated as Hedging Instrument | Foreign Currency Derivative | Other Long-Term Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]	8,000,000
Gross amount of recognized liability derivatives	[1]	4,000,000
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives		2,000,000	3,000,000
Gross amount of recognized liability derivatives		2,000,000	6,000,000
Not Designated as Hedging Instrument | Commodity Derivative | Other Current Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives			0
Not Designated as Hedging Instrument | Commodity Derivative | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized liability derivatives			2,000,000
Not Designated as Hedging Instrument | Foreign Currency Derivative | Other Current Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]	0
Gross amount of recognized liability derivatives	[1]	1,000,000
Net amount of derivative liability presented in the Balance Sheet	[1]	1,000,000
Not Designated as Hedging Instrument | Foreign Currency Derivative | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]	2,000,000	2,000,000
Gross amount of recognized liability derivatives	[1]	1,000,000	3,000,000
Net amount of derivative asset presented in the Balance Sheet	[1]	1,000,000
Net amount of derivative liability presented in the Balance Sheet	[1]		1,000,000
Not Designated as Hedging Instrument | Foreign Currency Derivative | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]		1,000,000
Gross amount of recognized liability derivatives	[1]		1,000,000
Net amount of derivative liability presented in the Balance Sheet	[1]		0
Cash Flow Hedging | Designated as Hedging Instrument | Commodity Derivative | Other Current Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives		7,000,000	0
Cash Flow Hedging | Designated as Hedging Instrument | Commodity Derivative | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized liability derivatives		0	39,000,000
Cash Flow Hedging | Designated as Hedging Instrument | Commodity Derivative | Other Long-Term Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives		4,000,000	0
Cash Flow Hedging | Designated as Hedging Instrument | Commodity Derivative | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized liability derivatives		0	10,000,000
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Currency Derivative | Other Current Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]	6,000,000
Gross amount of recognized liability derivatives	[1]	3,000,000
Net amount of derivative asset presented in the Balance Sheet	[1]	3,000,000
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Currency Derivative | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]	9,000,000	3,000,000
Gross amount of recognized liability derivatives	[1]	55,000,000	69,000,000
Net amount of derivative liability presented in the Balance Sheet	[1]	46,000,000	66,000,000
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Currency Derivative | Other Long-Term Assets
Derivatives, Fair Value [Line Items]
Net amount of derivative asset presented in the Balance Sheet	[1]	4,000,000
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Currency Derivative | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]	0	1,000,000
Gross amount of recognized liability derivatives	[1]	11,000,000	12,000,000
Net amount of derivative liability presented in the Balance Sheet	[1]	11,000,000	$ 11,000,000
Net Investment Hedging | Designated as Hedging Instrument | Foreign Currency Derivative | Other Current Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives		2,000,000
Net Investment Hedging | Designated as Hedging Instrument | Foreign Currency Derivative | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized liability derivatives		$ 0

[1] Derivative instruments within this category are subject to master netting arrangements and are presented on a net basis in the consolidated balance sheets in accordance with accounting guidance related to the offsetting of amounts related to certain contracts.