Variable Interest Entities	12 Months Ended
Mar. 31, 2013
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Variable Interest Entities	Variable Interest Entities We are involved with VIEs, which we do not consolidate because we do not have the power to direct the activities that most significantly impact their economic performance and thus are not considered the primary beneficiary of the entities. Our relationships include equity investments, lending, leasing, contractual or other relationships with the VIEs. Our most significant relationships are with oncology and other specialty practices. Under these practice arrangements, we generally own or lease all of the real estate and the equipment used by the affiliated practices and manage the practices' administrative functions. Our maximum exposure to loss (regardless of probability) as a result of all VIEs was $1.1 billion and $1.1 billion at March 31, 2013 and 2012, which primarily represents the value of intangible assets related to service agreements and lease and loan receivables. These amounts exclude the customer loan guarantees discussed in Financial Note 21, “Financial Guarantees and Warranties.” We believe that there is no material loss exposure on these assets or from these relationships.

Variable Interest Entities

We are involved with VIEs, which we do not consolidate because we do not have the power to direct the activities that most significantly impact their economic performance and thus are not considered the primary beneficiary of the entities. Our relationships include equity investments, lending, leasing, contractual or other relationships with the VIEs. Our most significant relationships are with oncology and other specialty practices. Under these practice arrangements, we generally own or lease all of the real estate and the equipment used by the affiliated practices and manage the practices' administrative functions. Our maximum exposure to loss (regardless of probability) as a result of all VIEs was $1.1 billion and $1.1 billion at March 31, 2013 and 2012, which primarily represents the value of intangible assets related to service agreements and lease and loan receivables. These amounts exclude the customer loan guarantees discussed in Financial Note 21, “Financial Guarantees and Warranties.” We believe that there is no material loss exposure on these assets or from these relationships.