Fair Value Measurements and Derivatives - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	$ 164	$ 162
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	164	162
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	64	64
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	100	98
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	1	2
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	9	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	1	2
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	9	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	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	2	5
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	8	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	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	2	5
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	$ 8	$ 9