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Business Combinations (Details) $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2018 USD ($) | May 23, 2018 USD ($) | May 23, 2018 CAD ($) | Jan. 02, 2018 USD ($) | Apr. 03, 2017 USD ($) | May 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) pharmacy | Dec. 31, 2016 CAD ($) pharmacy | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) pharmacy | Dec. 31, 2017 CAD ($) pharmacy | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 10,627,000,000 |  |  |  |  | $ 10,924,000,000 |
Net purchase consideration |  |  |  |  |  |  |  |  |  | 840,000,000 | $ 1,874,000,000 |  |  |  |  |
Medical Specialties Distributors LLC (“MSD”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred to acquire business | $ 784,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired as of the acquisition date, excluding goodwill and intangibles | 244,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities assumed as of the acquisition date | 161,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 375,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 326,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life of intangibles | 18 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rexall Health | CANADA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  |  |  |  |  | $ 2,100,000,000 | $ 2,900 |  |  |  |  |  |  |
Number of retail pharmacies | pharmacy |  |  |  |  |  |  |  | 413 | 413 |  |  |  |  |  |  |
Number of Stores Sold | pharmacy |  |  |  |  |  |  |  |  |  |  |  | 27 | 27 |  |  |
RxCrossroads |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired as of the acquisition date, excluding goodwill and intangibles |  |  |  | $ 128,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Liabilities assumed as of the acquisition date |  |  |  | 56,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 386,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 262,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life of intangibles |  |  |  | 14 years |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  | $ 720,000,000 |  |  |  |  |  |  |  |  |  |  |  |
CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |
intraFUSION, BDI Pharma, LLC, and Uniprix Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired as of the acquisition date, excluding goodwill and intangibles |  |  |  |  |  |  |  |  |  | 292,000,000 |  |  |  |  |  |
Liabilities assumed as of the acquisition date |  |  |  |  |  |  |  |  |  | 160,000,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 246,000,000 |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  | 118,000,000 |  |  |  |  |  |
Net purchase consideration |  |  |  |  |  |  | $ 485,000,000 |  |  |  |  |  |  |  |  |
Additional amount, Up to | CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 160,000,000 |  |
Estimate of Fair Value | CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | $ 113,000,000 |  |  |  |  | $ 64,000,000 |  |  |  |  | $ 124,000,000 |
Payment for contingent consideration liability |  |  |  |  |  | $ 68,000,000 |  |  |  |  |  |  |  |  |  |
Third Party Buyer of Rexall Health | Rexall Health | CANADA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds received |  |  |  |  |  |  |  |  |  |  |  | $ 94,000,000 |  |  |  | $ 116
Third Party Seller of Rexall Health | Rexall Health | CANADA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from prior acquisitions |  | $ 97,000,000 | $ 125 |  |  |  |  |  |  |  |  | 119,000,000 | $ 147 |  |  |
Gain (loss) recognized on sale of stores |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |

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