Investment in AB InBev/SABMiller (Summary of Balance Sheet of SABMiller and AB InBev) (Details) - AB InBev [Member] - USD ($) $ in Millions	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016	Oct. 10, 2016
Schedule of Equity Method Investments [Line Items]
Difference between carrying amount and underlying equity	$ 11,700
Current assets		$ 30,920		$ 40,086
Long-term assets		213,696		223,701
Current liabilities		37,765		44,272
Long-term liabilities		134,236		139,112
Noncontrolling interests		$ 10,639		$ 9,177
Estimate of Fair Value Measurement [Member]
Schedule of Equity Method Investments [Line Items]
Fair value of investment	22,100		$ 20,900
Reported Value Measurement [Member]
Schedule of Equity Method Investments [Line Items]
Fair value of investment	$ 18,000		$ 17,900