Debt and Financing Activities (Accounts Receivable Sales Facility and Revolving Credit Facility) (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended	3 Months Ended			3 Months Ended
	Jun. 30, 2014 Accounts Receivable Sales Facility [Member]	Jun. 30, 2013 Accounts Receivable Sales Facility [Member]	Mar. 31, 2014 Accounts Receivable Sales Facility [Member]	Jun. 30, 2014 Revolving Credit Facility [Member]	Jun. 30, 2013 Revolving Credit Facility [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Jun. 30, 2014 Celesio [Member] Revolving Credit Facility [Member]	Mar. 31, 2014 Celesio [Member] Revolving Credit Facility [Member]	Jun. 30, 2014 Celesio [Member] Four Percent Bonds Due October Eighteen Two Thousand Sixteen [Member]	Mar. 31, 2014 Celesio [Member] Four Percent Bonds Due October Eighteen Two Thousand Sixteen [Member]	Feb. 06, 2014 Celesio [Member] Four Percent Bonds Due October Eighteen Two Thousand Sixteen [Member]	Jun. 30, 2014 Celesio [Member] Four Point Five Percent Bonds Due April Twenty Six Two Thousand Seventeen [Member]	Mar. 31, 2014 Celesio [Member] Four Point Five Percent Bonds Due April Twenty Six Two Thousand Seventeen [Member]	Feb. 06, 2014 Celesio [Member] Four Point Five Percent Bonds Due April Twenty Six Two Thousand Seventeen [Member]
Line of Credit Facility [Line Items]
Credit Facility Capacity	$ 1,350,000,000			$ 1,300,000,000			$ 2,000,000,000
Line of Credit Facility, Expiration Date	Nov. 15, 2014			Sep. 23, 2016
Line of Credit Facility, Interest Rate Description				bear interest based upon either the London Interbank Offered Rate or a prime rate
Proceeds from Lines of Credit	0	100,000,000		0	0		159,000,000
Repayments of Lines of Credit	0	100,000,000					30,000,000
Borrowings Outstanding	0		0	0		0	321,000,000	188,000,000
Line of Credit Facility, Covenant Compliance	we were in compliance with all covenants		we were in compliance with all covenants
Pledged Assets, Not Separately Reported, Finance Receivables	$ 0		$ 0
Debt Instrument, Interest Rate, Stated Percentage									4.00%	4.00%	4.00%	4.50%	4.50%	4.50%