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Represents the charge against earnings during the period for commitment fees and debt issuance expenses.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time.

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Debt And Financing Activities (Senior Bridge Term Loan Facility) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended				1 Months Ended	3 Months Ended				12 Months Ended	1 Months Ended				12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Bridge Loan [Member] Corporate [Member]	Feb. 28, 2013 PSS World Medical [Member] Bridge Loan [Member]	Mar. 08, 2013 PSS World Medical [Member] Bridge Loan [Member]	Mar. 31, 2013 PSS World Medical [Member] Bridge Loan [Member]	Feb. 22, 2013 PSS World Medical [Member] Bridge Loan [Member]	Dec. 31, 2012 PSS World Medical [Member] Bridge Loan [Member]	Mar. 31, 2013 PSS World Medical [Member] Bridge Loan [Member] Corporate [Member]	Feb. 28, 2011 US Oncology Holdings Incorporation [Member] Bridge Loan [Member]	Jan. 31, 2011 US Oncology Holdings Incorporation [Member] Bridge Loan [Member]	Dec. 31, 2010 US Oncology Holdings Incorporation [Member] Bridge Loan [Member]	Nov. 30, 2010 US Oncology Holdings Incorporation [Member] Bridge Loan [Member]	Mar. 31, 2011 US Oncology Holdings Incorporation [Member] Bridge Loan [Member] Corporate [Member]
Debt Instrument [Line Items]
Credit facility								$ 900	$ 2,100				$ 1,000	$ 2,000
Proceeds from Bridge Loan	2,225	400	1,000		900							1,000
Repayment of Bridge Loan	2,625	0	1,000			900					1,000
Bridge loan interest rate							1.20%				1.76%
Interest expense: bridge loan fees	$ 11	$ 0	$ 25	$ 0						$ 11					$ 25