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Business Combinations - Other Acquisition (Details) $ in Millions, CAD in Billions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2016 USD ($) cancer_treatment_facility state | Feb. 29, 2016 USD ($) | Mar. 31, 2016 USD ($) pharmacy | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD
Sainsbury | United Kingdom |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net purchase consideration |  | $ 174 |  |  |
Interest rate |  | 0.033 |  |  |
UDG |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gross purchase consideration |  |  | $ 412 |  |
Vantage | Subsequent Event |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net purchase consideration | $ 527 |  |  |  |
Number of cancer treatment facilities (more than) | cancer_treatment_facility | 51 |  |  |  |
Number of states | state | 13 |  |  |  |
Biologics | Subsequent Event |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gross purchase consideration | $ 700 |  |  |  |
Rexall Health |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Currency exchange ratio, CAD per USD |  |  | 0.77 |  |
Rexall Health | Scenario, Forecast |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net purchase consideration |  |  |  | $ 2,300 | CAD 3
Rexall Health | Canada |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of pharmacies that will be acquired | pharmacy |  |  | 470 |  |

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