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Business Combinations (Details) € in Millions, £ in Millions, $ in Millions | 1 Months Ended | 9 Months Ended
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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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