Derivative Financial Instruments (Details Textual) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Notional amount	$ 355	$ 275
Net unrealized gains on cash flow hedges	14
Foreign Exchange Contract | Buy SEK Sell EUR
Derivative [Line Items]
Notional amount	140	190
Foreign Exchange Contract | Buy EUR Sell USD
Derivative [Line Items]
Notional amount	85
Foreign Exchange Contract | Buy EUR Sell GBP
Derivative [Line Items]
Notional amount	51	37
Foreign Exchange Contract | Buy PLN Sell EUR
Derivative [Line Items]
Notional amount		$ 34