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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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