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Derivatives And Hedging Activities Fair Value of Derivative Instruments in the Balance Sheet (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		$ (20)	$ 12
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives		11	45
Gross amount of recognized liability derivatives		31	33
Designated as Hedging Instrument | Foreign Currency Derivative | Other Current Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives			3
Gross amount of recognized liability derivatives			0
Designated as Hedging Instrument | Foreign Currency Derivative | Other Long-Term Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]	2
Gross amount of recognized liability derivatives	[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		0	27
Cash Flow Hedging | Designated as Hedging Instrument | Commodity Derivative | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized liability derivatives		15	0
Cash Flow Hedging | Designated as Hedging Instrument | Commodity Derivative | Other Long-Term Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives		0	8
Cash Flow Hedging | Designated as Hedging Instrument | Commodity Derivative | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized liability derivatives		7	0
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]	9
Gross amount of recognized liability derivatives	[1]	3
Net amount of derivative asset presented in the Balance Sheet	[1]	6	3
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Currency Derivative | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]	0	7
Gross amount of recognized liability derivatives	[1]	4	17
Net amount of derivative liability presented in the Balance Sheet	[1]	(4)	(10)
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]	2
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	0
Gross amount of recognized liability derivatives	[1]	2	11
Net amount of derivative liability presented in the Balance Sheet	[1]	$ (2)	(11)
Net Investment Hedging | Designated as Hedging Instrument | Foreign Currency Derivative | Other Current Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives			0
Net Investment Hedging | Designated as Hedging Instrument | Foreign Currency Derivative | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized liability derivatives			$ 5
[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.

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