Derivative Financial Instruments (Narrative) (Details) € in Millions, $ in Millions		1 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 EUR (€)
Derivative [Line Items]
Notional Value		$ 500
Swap Derivative 4 Point 27 Percent Maturing September 11, 2020 [Member]
Derivative [Line Items]
Notional Value	$ 250
Swap Derivative 1 Point 02 Percent Maturing January 2, 2016 [Member]
Derivative [Line Items]
Expiration Date		Jan. 02, 2016
Swap Derivative 2 Point 63 Percent Maturing September 11, 2020 [Member]
Derivative [Line Items]
Notional Value | €			€ 193
Swap Derivative 2 Point 77 Percent Maturing April 17, 2019 [Member]
Derivative [Line Items]
Notional Value	225
Swap Derivative 3 Point 62 Percent Maturing April 17, 2019 [Member]
Derivative [Line Items]
Notional Value | €			€ 162
Cross-currency swaps
Derivative [Line Items]
Derivative, Cash Received on Hedge	$ 88