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Business Combinations (Details) CAD in Millions |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2017 USD ($) | Dec. 28, 2016 USD ($) pharmacy | Dec. 28, 2016 CAD | Sep. 30, 2017 USD ($) pharmacy | Sep. 30, 2017 USD ($) pharmacy | Sep. 30, 2017 CAD pharmacy | Sep. 30, 2016 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 CAD | Mar. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  |  | $ 1,874,000,000 |  | $ 2,041,000,000 |  |  |
Goodwill |  |  |  | $ 11,732,000,000 | 11,732,000,000 |  |  |  |  | $ 10,586,000,000
Gain (loss) on sale of stores |  |  |  |  | 47,000,000 |  | (113,000,000) |  |  |
CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net purchase consideration | $ 1,300,000,000 |  |  |  |  |  |  |  |  |
Assets acquired as of the acquisition date, excluding goodwill and intangibles | 53,000,000 |  |  |  |  |  |  |  |  |
Liabilities assumed as of the acquisition date | 8,000,000 |  |  |  |  |  |  |  |  |
Goodwill | 855,000,000 |  |  |  |  |  |  |  |  |
Acquired identifiable intangibles | $ 502,000,000 |  |  |  |  |  |  |  |  |
Uniprix Group [Member] | CANADA |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Pharmacies Operated | pharmacy |  |  |  | 375 |  |  |  |  |  |
intraFUSION, BDI Pharma, LLC, and Uniprix Group [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  | $ 478,000,000 |  |  |  |  |  |
Goodwill |  |  |  | 222,000,000 | 222,000,000 |  |  |  |  |
Acquired identifiable intangibles |  |  |  | 119,000,000 | $ 119,000,000 |  |  |  |  |
Rexall Health | CANADA |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  | $ 2,100,000,000 | CAD 2,900 |  |  |  |  |  |  |
Assets acquired as of the acquisition date, excluding goodwill and intangibles |  | 566,000,000 |  |  |  |  |  |  |  |
Liabilities assumed as of the acquisition date |  | 212,000,000 |  |  |  |  |  |  |  |
Goodwill |  | 950,000,000 |  |  |  |  |  |  |  |
Acquired identifiable intangibles |  | $ 872,000,000 |  |  |  |  |  |  |  |
Number of retail pharmacies | pharmacy |  | 470 |  |  |  |  |  |  |  |
Number of retail pharmacies sold | pharmacy |  |  |  |  | 27 | 27 |  |  |  |
Gain (loss) on sale of stores |  |  |  |  | $ 0 |  |  |  |  |
Measurement period adjustments to provisional fair value of other long-term assets |  |  |  |  | 21,000,000 |  |  |  |  |
Measurement period adjustments to provisional fair value of intangibles |  |  |  |  | 17,000,000 |  |  |  |  |
Vantage Oncology Holdings, LLC (“Vantage”), Biologics, Inc., UDG Healthcare Plc (“UDG”) and Other Businesses |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  |  |  |  | $ 2,000,000,000 |  |  |
Additional amount, Up to | CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  | $ 160,000,000 |  |
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 | $ 113,000,000 |  |  |  |  |  |  |  |  |
Third Party Buyer | Rexall Health | CANADA |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of stores |  |  |  | $ 94,000,000 | 94,000,000 |  |  |  | CAD 116 |
Third Party Seller of Rexall Health | Rexall Health | CANADA |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds for settlement of post-closing purchase price adjustment |  |  |  |  | $ 119,000,000 | CAD 147 |  |  |  |

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