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Investment in AB InBev/SABMiller (Derivative Financial Instruments) (Details) £ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
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Oct. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Aug. 31, 2016 GBP (£) | Aug. 31, 2016 USD ($) | Nov. 30, 2015 GBP (£) | Nov. 30, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from derivative financial instruments | $ 500 | $ 0 | $ 510 | $ 0 |  |  |  |
Foreign Exchange Option [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Notional amount of option |  |  |  |  | £ 378 | $ 480 | £ 1,625 | $ 2,467
Foreign Exchange Option [Member] | November 2015 Option [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Derivative gain |  |  | 330 | $ 20 |  |  |  |
Foreign Exchange Option [Member] | August 2015 Option [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Derivative gain |  |  | $ 19 |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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