Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 July 15, 2022 Interest Rate Swaps [Member]	Oct. 30, 2014 Subsequent Event [Member] June 30, 2015 Interest Rate Swaps [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Proceeds from Termination of Interest Rate Derivatives	$ 14
Derivative, Fixed Interest Rate		3.95%	2.43%
Derivative, Average Variable Interest Rate		1.11%
Notional amount of debt		400
Notional amount of debt			$ 200