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Business Combinations (Narrative) (Details) (USD $)	9 Months Ended	0 Months Ended
Business Combinations (Narrative) (Details) (USD $)	Dec. 31, 2010	Dec. 30, 2010 US Oncology [Member]
Business Combinations
Purchase price of acquisition		$ 2,100,000,000
Cash consideration		200,000,000
Assumption of liabilities	$ (1,910,000,000)	$ (1,900,000,000)

The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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