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Business Combinations (Details) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2018 USD ($) | May 23, 2018 USD ($) | May 23, 2018 CAD ($) | Apr. 03, 2017 USD ($) | May 31, 2019 USD ($) | May 31, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2016 USD ($) pharmacy | Dec. 31, 2016 CAD ($) pharmacy | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 9,408,000,000 |  | $ 9,358,000,000
Net purchase consideration |  |  |  |  |  |  |  |  |  | 95,000,000 | $ 840,000,000 |
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 |  |  |  |  |  |  | $ 239,000,000 |  |  |  |  |
Liabilities assumed as of the acquisition date |  |  |  |  |  |  | 169,000,000 |  |  |  |  |
Goodwill |  |  |  |  |  |  | 388,000,000 |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 326,000,000 |  |  |  |  |
Weighted average life of intangibles |  |  |  |  |  |  | 18 years |  |  |  |  |
CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  |
Rexall Health | Canada |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  |  |  |  |  | $ 2,100,000,000 | $ 2,900 |  |  |
Number of retail pharmacies | pharmacy |  |  |  |  |  |  |  | 400 | 400 |  |  |
Estimate of Fair Value | CoverMyMeds, LLC (CMM) |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 69,000,000
Payment for contingent consideration liability |  |  |  |  | $ 69,000,000 | $ 68,000,000 |  |  |  |  |  |
Third Party Seller of Rexall Health | Rexall Health | Canada |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from prior acquisitions |  | $ 97,000,000 | $ 125 |  |  |  |  |  |  |  | $ 97,000,000 |

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