Financing Arrangements and Debt (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	May 31, 2013
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	$ 2,000,000,000	$ 1,500,000,000
Credit facility, maturity date	Jun. 01, 2017
Credit facility interest rate above LIBOR	1.25%
Line of credit facility fee	0.25%
Committed Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	2,000,000,000
Line of Credit Facility, Current Borrowing Capacity	450,000,000
Uncommitted Credit Facilities [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	435,000,000
Line of Credit Facility, Current Borrowing Capacity	$ 0