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Business Combinations (Details) $ in Millions, CAD in Billions |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 03, 2017 USD ($) | Dec. 28, 2016 USD ($) pharmacy | Dec. 28, 2016 CAD | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net purchase consideration |  |  |  | $ 1,485 | $ 1,819 |  |
Goodwill |  |  |  | 11,750 |  |  | $ 10,586
CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net purchase consideration | $ 1,300 |  |  |  |  |  |
Assets acquired as of the acquisition date, excluding goodwill and intangibles | 54 |  |  |  |  |  |
Liabilities assumed as of the acquisition date | 8 |  |  |  |  |  |
Goodwill | 854 |  |  |  |  |  |
Acquired identifiable intangibles | $ 502 |  |  |  |  |  |
Rexall Health | CANADA |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net purchase consideration |  | $ 2,100 | CAD 2.9 |  |  |  |
Assets acquired as of the acquisition date, excluding goodwill and intangibles |  | 674 |  |  |  |  |
Liabilities assumed as of the acquisition date |  | 212 |  |  |  |  |
Goodwill |  | 950 |  |  |  |  |
Acquired identifiable intangibles |  | $ 872 |  |  |  |  |
Number of retail pharmacies | pharmacy |  | 470 |  |  |  |  |
Measurement period adjustments to provisional fair value of intangibles |  |  |  | 17 |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Assets of stores to be divested |  |  |  | $ 193 |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale | Rexall Health | CANADA |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of retail pharmacies | pharmacy |  | 27 |  |  |  |  |
Additional amount, Up to | CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | $ 200 |
Customer relationships | CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average life of intangibles | 17 years |  |  |  |  |  |
Customer relationships | Rexall Health | CANADA |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average life of intangibles |  | 19 years | 19 years |  |  |  |
Trade Names | Rexall Health | CANADA |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average life of intangibles |  | 19 years | 19 years |  |  |  |
Estimate of Fair Value | CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration | $ 113 |  |  |  |  |  |

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