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Derivatives And Hedging Activities Fair Value of Derivative Instruments in the Balance Sheet (Details) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net		$ 9	$ 12
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives		33	45
Gross amount of recognized liability derivatives		24	33
Cash Flow Hedging | Designated as Hedging Instrument | Commodity derivatives | Other Current Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives		1	27
Cash Flow Hedging | Designated as Hedging Instrument | Commodity derivatives | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized liability derivatives		8	0
Cash Flow Hedging | Designated as Hedging Instrument | Commodity derivatives | 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 derivatives | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized liability derivatives		5	0
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency derivatives | Other Current Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]	16	3
Gross amount of recognized liability derivatives	[1]	4	0
Net amount of derivative asset presented in the Balance Sheet	[1]	12	3
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency derivatives | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]	4	7
Gross amount of recognized liability derivatives	[1]	5	17
Net amount of derivative liability presented in the Balance Sheet	[1]	(1)	(10)
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency derivatives | Other Long-Term Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives	[1]	8
Gross amount of recognized liability derivatives	[1]	1
Net amount of derivative asset presented in the Balance Sheet	[1]	7
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency derivatives | 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]	1	11
Net amount of derivative liability presented in the Balance Sheet	[1]	(1)	(11)
Net Investment Hedging | Designated as Hedging Instrument | Foreign currency derivatives | Other Current Assets
Derivatives, Fair Value [Line Items]
Gross amount of recognized asset derivatives		4	0
Net Investment Hedging | Designated as Hedging Instrument | Foreign currency derivatives | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Gross amount of recognized liability derivatives		$ 0	$ 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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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

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