The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Equity Method Investments, Equity Method Investments (Details) - USD ($) $ in Millions	May. 31, 2015	Dec. 31, 2014	Aug. 31, 2014	Aug. 02, 2012
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 0		$ 7,336
Equity method investment ownership interest percentage (in hundredths)	45.00%
Alliance Boots [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Value			$ 7,336
Equity method investment ownership interest percentage (in hundredths)	100.00%	45.00%	45.00%	45.00%
Other [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 1,244		$ 74
Other [Member] \| Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership interest percentage (in hundredths)	12.00%		30.00%
Other [Member] \| Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership interest percentage (in hundredths)	50.00%		50.00%
Total [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 1,244		$ 7,410