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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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