Debt And Financing Arrangements (Narrative) (Details) $ in Billions	Mar. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Excess of fair value over carrying value of long-term debt	$ 1.1
Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	6.1
Unused lines of credit	5.4
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	4.0
Unused lines of credit	0.7
Accounts Receivable Securitization Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1.6
Used lines of credit	$ 1.1