Debt And Financing Activities (Senior Bridge Term Loan Facility) (Narrative) (Details) Share data in Millions, unless otherwise specified	12 Months Ended									0 Months Ended	1 Months Ended	12 Months Ended					3 Months Ended		12 Months Ended	1 Months Ended			1 Months Ended						3 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2014 Corporate [Member] USD ($)	Mar. 31, 2013 Corporate [Member] USD ($)	Mar. 31, 2012 Corporate [Member] USD ($)	Feb. 06, 2014 Celesio [Member] USD ($)	Mar. 31, 2014 Celesio [Member] Promissory Notes [Member] USD ($)	Mar. 31, 2013 Celesio [Member] Promissory Notes [Member] USD ($)	Feb. 04, 2014 Celesio [Member] Senior Bridge Term Loan Agreement, 2014 [Member] USD ($)	Mar. 31, 2014 Celesio [Member] Senior Bridge Term Loan Agreement, 2014 [Member] USD ($)	Mar. 31, 2014 Celesio [Member] Senior Bridge Term Loan Agreement, 2014 [Member] Corporate [Member] USD ($)	Mar. 31, 2014 Celesio [Member] 4.00 % Bonds Due October 18, 2016 [Member] USD ($)	Mar. 31, 2013 Celesio [Member] 4.00 % Bonds Due October 18, 2016 [Member] USD ($)	Mar. 31, 2014 Celesio [Member] 4.50% Bonds Due April 26, 2017 [Member] USD ($)	Mar. 31, 2013 Celesio [Member] 4.50% Bonds Due April 26, 2017 [Member] USD ($)	Mar. 08, 2013 PSS World Medical [Member] Bridge Loan [Member] USD ($)	Mar. 31, 2013 PSS World Medical [Member] Bridge Loan [Member]	Mar. 31, 2013 PSS World Medical [Member] Bridge Loan [Member] Corporate [Member] USD ($)	Feb. 28, 2013 PSS World Medical [Member] Senior Bridge Term Loan Agreement, 2013 [Member] USD ($)	Feb. 22, 2013 PSS World Medical [Member] Senior Bridge Term Loan Agreement, 2013 [Member] USD ($)	Dec. 31, 2012 PSS World Medical [Member] Senior Bridge Term Loan Agreement, 2013 [Member] USD ($)	Jan. 31, 2014 Senior Bridge Term Loan Agreement, 2013 [Member] Celesio [Member]	Jan. 31, 2014 Senior Bridge Term Loan Agreement, 2013 [Member] Celesio [Member] Bridge Loan [Member] USD ($)	Mar. 31, 2013 Revolving Credit Facility [Member] USD ($)	Nov. 30, 2013 Revolving Credit Facility [Member] Maximum [Member]	Oct. 31, 2013 Revolving Credit Facility [Member] Maximum [Member]	Mar. 31, 2014 Revolving Credit Facility [Member] Celesio [Member] EUR (€)	Mar. 31, 2014 Private Purchases [Member] Celesio [Member]
Debt Instrument [Line Items]
Credit facility																					$ 900,000,000	$ 2,100,000,000		$ 5,500,000,000				€ 500,000,000
Debt Instrument, Term																							364 days
Repayments of Short-term Debt	6,122,000,000	2,625,000,000	0								4,076,000,000						900,000,000
Proceeds from Bridge Loan	6,145,000,000	2,225,000,000	400,000,000							4,957,000,000										900,000,000
Bridge loan interest rate											1.39%							1.20%
Interest expense: bridge loan fees				46,000,000	11,000,000	0						46,000,000							11,000,000
Borrowings Outstanding																									0
Debt Conversion, Converted Instrument, Shares Issued																													0.7
Long-term debt	10,373,000,000	4,873,000,000											507,000,000	0	737,000,000	0
Ratio of Indebtedness to Net Capital																										0.65	0.565
Bilateral credit line							1,662,000,000
Other long-term debt								$ 297,000,000	$ 0