Investment in AB InBev/SABMiller (AB InBev and SABMiller Business Combination) (Details)		1 Months Ended	3 Months Ended								12 Months Ended
	Oct. 10, 2016 USD ($)	Oct. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) shares	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 10, 2016 £ / shares shares	Oct. 09, 2016
Business Acquisition [Line Items]
Cash component of the partial share alternative											$ 0	$ 4,773,000,000	$ 0
Proceeds from derivative financial instruments		$ 500,000,000									0	510,000,000	0
Total pre-tax cash from AB InBev and derivative financial instruments	$ 5,300,000,000
Purchase of AB InBev ordinary shares											0	1,578,000,000	0
Gain on AB InBev/SABMiller business combination			$ 0	$ 37,000,000	$ 408,000,000	$ 0	$ 13,660,000,000	$ 48,000,000	$ 117,000,000	$ 40,000,000	445,000,000	13,865,000,000	5,000,000
Earnings from equity investment											532,000,000	$ 795,000,000	757,000,000
AB InBev [Member]
Business Acquisition [Line Items]
Difference between carrying amount and underlying equity			$ 11,700,000,000								$ 11,700,000,000
Ordinary shares owned/purchased (in shares) | shares			12,000,000								12,000,000
Equity method investment, ownership percentage (approximately)			10.20%				10.20%				10.20%	10.20%		9.60%
Cash component of the partial share alternative	$ 4,800,000,000
Purchase of AB InBev ordinary shares							$ 1,600,000,000
Earnings from equity investment											$ 532,000,000	$ 0
SABMiller Plc [Member]
Business Acquisition [Line Items]
Ordinary shares owned/purchased (in shares) | shares														430,000,000
Equity method investment, ownership percentage (approximately)								27.00%							27.00%
Earnings from equity investment												795,000,000	$ 757,000,000
AB InBev [Member]
Business Acquisition [Line Items]
British pounds in cash for each SABMiller share, offered by AB InBev (GBP per share) | £ / shares														£ 45
Partial share alternative percentage available for SABMiller shares (approximately)														41.00%
Gain on AB InBev/SABMiller business combination												13,900,000,000
After-tax accounting gain on AB InBev/SABMiller business combination (approximately)												9,000,000,000
Expected gain on AB InBev/SABMiller business combination											$ 445,000,000
Restricted Shares [Member] | AB InBev [Member]
Business Acquisition [Line Items]
Restricted shares, lock-up period											5 years
Estimate of Fair Value Measurement [Member] | AB InBev [Member]
Business Acquisition [Line Items]
Fair value of investment			$ 22,100,000,000				20,900,000,000				$ 22,100,000,000	20,900,000,000
Reported Value Measurement [Member] | AB InBev [Member]
Business Acquisition [Line Items]
Fair value of investment			$ 18,000,000,000				$ 17,900,000,000				$ 18,000,000,000	$ 17,900,000,000