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Business Combinations - Acquisition of Rexall Health (Details) CAD in Billions |  | 12 Months Ended
--- | --- | ---
Dec. 28, 2016 USD ($) pharmacy | Dec. 28, 2016 CAD | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Cash purchase consideration |  |  | $ 4,237,000,000 | $ 40,000,000 | $ 170,000,000
Goodwill |  |  | 10,586,000,000 | 9,786,000,000 | $ 9,817,000,000
Total assets of discontinued operations |  |  | 24,000,000 | 635,000,000 |
Total liabilities of discontinued operations |  |  | 43,000,000 | $ 660,000,000 |
Rexall Health |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash purchase consideration | $ 2,121,000,000 |  |  |  |
Goodwill | 957,000,000 |  |  |  |
Acquired identifiable intangibles | $ 855,000,000 |  |  |  |
CANADA | Rexall Health |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of pharmacies | pharmacy | 470 |  |  |  |
Cash purchase consideration | $ 2,100,000,000 | CAD 2.9 |  |  |
Fair value of assets acquired (excluding goodwill and intangibles) |  |  | 681,000,000 |  |
Fair value of liabilities assumed |  |  | 209,000,000 |  |
Goodwill |  |  | 1,000,000,000 |  |
Acquired identifiable intangibles |  |  | 855,000,000 |  |
Held-for-sale |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total assets of discontinued operations |  |  | 184,000,000 |  |
Total liabilities of discontinued operations |  |  | $ 0 |  |
Held-for-sale | CANADA | Rexall Health |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of pharmacies | pharmacy | 26 |  |  |  |
Trade Names | Held-for-sale | CANADA | Rexall Health |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average life | 19 years | 19 years |  |  |
Customer Relationships | Held-for-sale | CANADA | Rexall Health |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average life | 19 years | 19 years |  |  |

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