Noncontrolling Interests (Narrative) (Details) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 Celesio [Member] USD ($)	Dec. 31, 2014 Celesio [Member] EUR (€)
Noncontrolling Interest [Line Items]
Dividends paid to noncontrolling interest shareholders			$ 16		$ 16
Dividends declared per common share	$ 0.24	$ 0.24	$ 0.72	$ 0.68		€ 0.30

Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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