Derivative Financial Instruments Derivative Financial Instruments (Schedule of Cross Currency Swap Derivatives) (Details) - Mar. 31, 2015 € in Millions, $ in Millions	USD ($)	EUR (€)
Derivative [Line Items]
Derivative, Cash Received on Hedge	$ 88
Gain (Loss) on Derivative Instruments, Net, Pretax	1
Swap Derivative 3 Point 62 Percent Maturing April 17, 2019 [Member]
Derivative [Line Items]
Derivative, Notional Amount	225
Swap Derivative 2 Point 77 Percent Maturing April 17, 2019 [Member]
Derivative [Line Items]
Derivative, Notional Amount | €		€ 162
Swap Derivative 4 Point 27 Percent Maturing September 11, 2020 [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 250
Swap Derivative 2 Point 63 Percent Maturing September 11, 2020 [Member]
Derivative [Line Items]
Derivative, Notional Amount | €		€ 193