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Business Combinations (Details) $ in Millions, $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2018 USD ($) | May 23, 2018 USD ($) | May 23, 2018 CAD ($) | Jan. 02, 2018 USD ($) | Apr. 03, 2017 USD ($) | May 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) pharmacy | Dec. 31, 2016 CAD ($) pharmacy | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 10,585 |  |  |  |  |  | $ 10,924
Net purchase consideration |  |  |  |  |  |  | 826 |  | $ 1,485 |  |  |  |
Medical Specialties Distributors LLC (“MSD”) |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred to acquire business | $ 784 |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired as of the acquisition date, excluding goodwill and intangibles | 245 |  |  |  |  |  |  |  |  |  |  |  |
Liabilities assumed as of the acquisition date | 172 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 360 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 351 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life of intangibles | 18 years |  |  |  |  |  |  |  |  |  |  |  |
Rexall Health | CANADA |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail pharmacies | pharmacy |  |  |  |  |  |  |  |  |  | 450 | 450 |  |
Net purchase consideration |  |  |  |  |  |  |  |  |  | $ 2,100 | $ 2,900 |  |
RxCrossroads |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired as of the acquisition date, excluding goodwill and intangibles |  |  |  | $ 128 |  |  |  |  |  |  |  |  |
Liabilities assumed as of the acquisition date |  |  |  | 42 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 372 |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 262 |  |  |  |  |  |  |  |  |
Weighted average life of intangibles |  |  |  | 14 years |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  | $ 720 |  |  |  |  |  |  |  |  |
CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  |  | $ 1,300 |  |  |  |  |  |  |  |
intraFUSION, BDI Pharma, LLC, and Uniprix Group |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired as of the acquisition date, excluding goodwill and intangibles |  |  |  |  |  |  |  | $ 292 |  |  |  |  |
Liabilities assumed as of the acquisition date |  |  |  |  |  |  |  | 160 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 246 |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | 118 |  |  |  |  |
Net purchase consideration |  |  |  |  |  |  |  | $ 485 |  |  |  |  |
Additional amount, Up to | CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  | $ 160 |
Estimate of Fair Value | CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | $ 113 |  | $ 54 |  |  |  |  |  | $ 124
Payment for contingent consideration liability |  |  |  |  |  | $ 68 |  |  |  |  |  |  |
Third Party Seller of Rexall Health | Rexall Health | CANADA |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from prior acquisitions |  | $ 97 | $ 125 |  |  |  |  |  |  |  |  |  |

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