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Business Combinations - Other Acquisitions (Details) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 USD ($) pharmacy | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |
Cash purchase consideration | $ 2,893 | $ 4,237 | $ 40
Goodwill | 10,924 | $ 10,586 | $ 9,786
intraFUSION, BDI Pharma, LLC, and Uniprix Group |  |  |
Business Acquisition [Line Items] |  |  |
Cash purchase consideration | 485 |  |
Goodwill | 240 |  |
Acquired identifiable intangibles | 118 |  |
Fair value of assets acquired (excluding goodwill and intangibles) | 292 |  |
Fair value of liabilities assumed | $ 154 |  |
CANADA | Uniprix Group |  |  |
Business Acquisition [Line Items] |  |  |
Number of Pharmacies Operated | pharmacy | 300 |  |

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