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Debt And Financing Activities (US Oncology Debt Acquired) (Narrative) (Details) (US Oncology Holdings, Inc. [Member], USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended
	Dec. 31, 2010 Senior Subordinated Notes, Due 2014 [Member]	Dec. 31, 2010 Senior Secured Notes, Due 2017 [Member]	Mar. 31, 2011 Senior Secured Notes Due 2017 And Senior Subordinated Notes Due 2014 [Member]
Debt Instrument [Line Items]
Interest rate on debt	10.75%	9.125%
Interest paid on US oncology debt acquired			$ 50
Payoff of all USON debt			$ 1,738
Debt maturity date, year	2014	2017

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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