Financing Arrangement (Line of Credit Facility) (Details) - Jun. 30, 2015 - Revolving Credit Facility [Member] - USD ($) $ in Millions	Total
Line of Credit Facility [Line Items]
Credit Facility, Maximum Borrowing Capacity	$ 500
Option To Request Additional Commitments On Credit Facility	250
Debt issuance costs	$ 2
Credit Facility, Initiation Date	Mar. 19, 2015
Credit Facility, Expiration Date	Mar. 19, 2020
Line of Credit Facility Term	5 years