Derivative Financial Instruments Derivative Financial Instruments (Schedule of Cross Currency Swaps) (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Swap Derivative 4 Point 27 Percent Maturing September 11, 2020 [Member] USD ($)		Dec. 31, 2014 Swap Derivative 2 Point 63 Percent Maturing September 11, 2020 [Member] EUR (€)		Dec. 31, 2014 Swap Derivative 3 Point 62 Percent Maturing April 17, 2019 [Member] USD ($)		Dec. 31, 2014 Swap Derivative 2 Point 77 Percent Maturing April 17, 2019 [Member] EUR (€)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	$ 250	[1]	€ 193	[2]	$ 225	[1]	€ 162	[2]
Effective Date	Sep. 11, 2014		Sep. 11, 2014		Apr. 17, 2014		Apr. 17, 2014
Expiration Date	Sep. 11, 2020		Sep. 11, 2020		Apr. 17, 2019		Apr. 17, 2019
Fixed Rate	4.27%		2.63%		3.62%		2.77%

[1] Represents the notional amount due from the counterparty at the maturity of the contract.

[2] Represents the notional amount due to the counterparty at the maturity of the contract.