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Investments in Equity Securities (Investment in AB InBev Narrative) (Details) shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Mar. 31, 2019 € / shares | Dec. 31, 2018 € / shares
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in equity securities | $ | $ 32,015 | $ 30,496 |  |
AB InBev [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Derivative instrument, number of shares hedged (in shares) | shares |  | 92.4 |  |
AB InBev [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of ordinary shares owned (in shares) | shares | 12.0 |  |  |
Equity method investment, ownership percentage | 10.10% |  |  |
Number of restricted shares owned (in shares) | shares | 185.0 |  |  |
Share price (in Euro per share) | € / shares |  |  | € 74.76 | € 57.70
Fair value of equity investment | $ | $ 16,600 | $ 13,100 |  |
Investments in equity securities | $ | $ 17,476 | $ 17,696 |  |
Difference between carrying amount and underlying equity, percentage | 5.00% | 26.00% |  |

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