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Business Combinations (Details) € in Millions, £ in Millions, $ in Millions	1 Months Ended							9 Months Ended
	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 USD ($)	Jul. 31, 2015 hospital_pharmacy	Jul. 31, 2015 GBP (£)	Jul. 31, 2015 USD ($)	Jul. 31, 2015 pharmacy	Jul. 31, 2015 in_store_pharmacy	Dec. 31, 2015
UDG | Ireland
Business Acquisition [Line Items]
Agreement to acquire pharmaceutical distribution business in cash	€ 408	$ 445
Currency exchange ratio, usd/euro								1.09
Sainsbury | U.K.
Business Acquisition [Line Items]
Agreement to acquire pharmaceutical distribution business in cash				£ 125	$ 185
Currency exchange ratio, usd/gbp								1.48
Number of businesses acquired			4			281	277

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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