Debt And Financing Arrangements (Narrative) (Details) $ in Billions	Jun. 30, 2017 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	6.7
Unused lines of credit	5.1
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	4.0
Unused lines of credit	0.2
Accounts Receivable Securitization Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1.5
Used lines of credit	$ 1.2