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Business Combinations - Acquisition of Rexall Health (Details) $ in Millions |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 23, 2018 USD ($) | May 23, 2018 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 28, 2016 USD ($) pharmacy | Dec. 28, 2016 CAD ($) pharmacy | Dec. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) pharmacy | Mar. 31, 2018 CAD ($) pharmacy | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2018 CAD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash purchase consideration |  |  |  |  |  |  | $ 2,893,000,000 |  | $ 4,237,000,000 | $ 40,000,000 |
Gain (loss) recognized from sale of stores |  |  |  |  |  |  | 169,000,000 |  | (94,000,000) | 103,000,000 |
Goodwill |  |  |  |  |  |  | $ 10,924,000,000 |  | $ 10,586,000,000 | $ 9,786,000,000 |
CANADA | Rexall Health |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of pharmacies | pharmacy |  |  |  | 450 | 450 |  |  |  |  |  |
Cash purchase consideration |  |  |  | $ 2,100,000,000 | $ 2,900 |  |  |  |  |  |
Number of stores sold | pharmacy |  |  |  |  |  |  | 27 | 27 |  |  |
Gain (loss) recognized from sale of stores |  |  |  |  |  | $ 0 |  |  |  |  |
Fair value of assets acquired (excluding goodwill and intangibles) |  |  | $ 560,000,000 |  |  | 560,000,000 |  |  |  |  |
Fair value of liabilities assumed |  |  | 210,000,000 |  |  | 210,000,000 |  |  |  |  |
Goodwill |  |  | 948,000,000 |  |  | 948,000,000 |  |  |  |  |
Acquired identifiable intangibles |  |  | $ 872,000,000 |  |  | $ 872,000,000 |  |  |  |  |
Held-for-sale | CANADA | Rexall Health |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of pharmacies | pharmacy |  |  |  | 27 | 27 |  |  |  |  |  |
Trade Names | Held-for-sale | CANADA | Rexall Health |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  | 19 years |  |  |  |  |  |  |  |
Customer relationships | Held-for-sale | CANADA | Rexall Health |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  | 19 years |  |  |  |  |  |  |  |
Third Party Buyer | CANADA | Rexall Health |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration agreed upon for sale of business |  |  |  |  |  |  | $ 94,000,000 |  |  |  | $ 116
Third Party Seller of Rexall Health | CANADA | Rexall Health |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Previous Acquisition |  |  |  |  |  |  | $ 119,000,000 | $ 147 |  |  |
Third Party Seller of Rexall Health | Subsequent Event | CANADA | Rexall Health |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Previous Acquisition | $ 98,000,000 | $ 126 |  |  |  |  |  |  |  |  |

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