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Acquisitions - Acquisition of Express Mart (Details) $ in Millions | Nov. 16, 2018 USD ($) Store | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 21,277 | $ 20,184
Express Mart |  |  |
Business Acquisition [Line Items] |  |  |
Number of stores | Store | 78 |  |
Cash consideration | $ 266 |  |
Property, plant and equipment, net | 97 |  |
Inventories | 9 |  |
Finite-lived intangibles | 2 |  |
Goodwill | $ 158 |  |

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