Business Combinations (Fair Value Of Assets Acquired And Liabilities Assumed) (Details) (USD $) In Millions, unless otherwise specified	Feb. 22, 2013 PSS World Medical [Member]	Mar. 25, 2012 Katz Group [Member] Amounts Previously Recognized As Of Acquisition Date [Member]		Sep. 30, 2012 Katz Group [Member] Purchase Price Allocation Adjustments [Member]	Sep. 30, 2012 Katz Group [Member] Amounts Recognized As Of Acquisition Date As Adjusted [Member]	Mar. 25, 2012 Katz Group [Member] Amounts Recognized As Of Acquisition Date As Adjusted [Member]	Dec. 30, 2010 US Oncology Holdings Incorporation [Member] Amounts Previously Recognized As Of Acquisition Date [Member]		Dec. 31, 2011 US Oncology Holdings Incorporation [Member] Purchase Price Allocation Adjustments [Member]	Dec. 31, 2011 US Oncology Holdings Incorporation [Member] Amounts Recognized As Of Acquisition Date As Adjusted [Member]
Business Acquisition [Line Items]
Current assets, net of cash acquired	$ 706	$ 33	[1]	$ (1)	$ 32		$ 662	[2]	$ (13)	$ 649
Goodwill	1,145	506	[1]	6	512		808	[2]	20	828
Intangible assets	557	441	[1]	1	442		1,007	[2]	(14)	993
Other long-term assets	183	15	[1]	(1)	14		354	[2]	(6)	348
Current liabilities	(376)	(37)	[1]	1	(36)		(489)	[2]	(1)	(490)
Current portion of long-term debt	(635)						(1,735)	[2]	0	(1,735)
Long-term deferred tax liabilities		(39)	[1]	0	(39)
Other long-term liabilities	(281)						(338)	[2]	16	(322)
Other stockholders' equity							(25)	[2]	(2)	(27)
Cash Paid for Acquisition	$ 1,299	$ 919		$ 6	$ 925	$ 925	$ 244		$ 0	$ 244

[1] As previously reported in our Form 10-K for the year ended March 31, 2012.

[2] As previously reported in our Form 10-K for the year ended March 31, 2011.