Business Combinations (Narrative) (Details) (USD $)	3 Months Ended		1 Months Ended		3 Months Ended		1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Feb. 28, 2013 PSS World Medical [Member]	Feb. 22, 2013 PSS World Medical [Member]	Jun. 30, 2012 Corporate Headquarters [Member]	Apr. 06, 2012 Corporate Headquarters [Member]	Feb. 28, 2013 Amounts Recognized As Of Acquisition Date As Adjusted [Member] PSS World Medical [Member]	Jun. 30, 2013 Amounts Recognized As Of Acquisition Date As Adjusted [Member] PSS World Medical [Member]	Feb. 22, 2013 Amounts Recognized As Of Acquisition Date As Adjusted [Member] PSS World Medical [Member]	Feb. 22, 2013 Amounts Previously Recognized As Of Acquisition Date [Member] PSS World Medical [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition			Feb. 22, 2013		Apr. 06, 2012
Name of Acquired Entity			PSS World Medical, Inc. (“PSS World Medical”)
Per Share Price of Outstanding Shares Acquired				$ 29.00
Purchase Price for Acquisition			$ 1,900,000,000
Cash Paid for Acquisition					90,000,000		1,300,000,000
Current Portion of Long-Term Debt Acquired								635,000,000	600,000,000	635,000,000	[1]
Description of Acquired Entity			PSS World Medical markets and distributes medical products and services throughout the United States
Currently acquired percentage of building						50.00%
Previously Held Percentage of Building						50.00%
Gain on Business Combination	0	81,000,000			81,000,000
Gain on Business Combination, Net of Tax					51,000,000
Fair value of assets acquired						180,000,000
Fair value of assets acquired, Buildings						113,000,000
Fair value of assets acquired, Land						$ 58,000,000
Property, Plant and Equipment, Useful Life					30 years

[1] As previously reported in our Form 10-K for the year ended March 31, 2013.