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Fair Value Measurements and Derivatives - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Marketable securities | $ 157 | $ 169
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Marketable securities | 157 | 169
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Marketable securities | 60 | 72
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Marketable securities | 97 | 97
Fair Value, Measurements, Recurring [Member] | Accounts Receivable Other [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts asset value | 2 | 1
Fair Value, Measurements, Recurring [Member] | Accounts Receivable Other [Member] | Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts asset value | 1 | 1
Fair Value, Measurements, Recurring [Member] | Accounts Receivable Other [Member] | Currency Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts asset value | 4 |
Fair Value, Measurements, Recurring [Member] | Accounts Receivable Other [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts asset value | 2 | 1
Fair Value, Measurements, Recurring [Member] | Accounts Receivable Other [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts asset value | 1 | 1
Fair Value, Measurements, Recurring [Member] | Accounts Receivable Other [Member] | Fair Value, Inputs, Level 2 [Member] | Currency Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts asset value | 4 |
Fair Value, Measurements, Recurring [Member] | Other Accrued Liabilities [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts liability value | 1 |
Fair Value, Measurements, Recurring [Member] | Other Accrued Liabilities [Member] | Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts liability value | 8 | 11
Fair Value, Measurements, Recurring [Member] | Other Accrued Liabilities [Member] | Currency Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts liability value |  | 9
Fair Value, Measurements, Recurring [Member] | Other Accrued Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts liability value | 1 |
Fair Value, Measurements, Recurring [Member] | Other Accrued Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts liability value | 8 | 11
Fair Value, Measurements, Recurring [Member] | Other Accrued Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Currency Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts liability value |  | $ 9
Fair Value, Measurements, Recurring [Member] | Other Noncurrent Liabilities [Member] | Currency Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts liability value | 1 |
Fair Value, Measurements, Recurring [Member] | Other Noncurrent Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Currency Swap [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Currency contracts liability value | $ 1 |

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