Debt And Financing Arrangements (Narrative) (Details) (USD $) In Billions, unless otherwise specified	Mar. 31, 2015
Debt And Financing Arrangements [Line Items]
Excess of fair value over carrying value of long-term debt	$ 1.4
Line of Credit [Member]
Debt And Financing Arrangements [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	6.3
Unused lines of credit	5.5
Commercial Paper [Member]
Debt And Financing Arrangements [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	4.0
Unused lines of credit	0.7
Accounts Receivable Securitization Facility [Member]
Debt And Financing Arrangements [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1.5
Used lines of credit	$ 1.3