Fair Value Measurements and Derivatives - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	$ 169	$ 169
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	169	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	65	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	104	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
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
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] | Interest Rate Swap [Member] | Fair Value Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swap liability value	2
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
Fair Value, Measurements, Recurring [Member] | Other Noncurrent Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swap liability value	$ 2