Investment in AB InBev/SABMiller (AB InBev and SABMiller Business Combination) (Details) $ in Millions		1 Months Ended	3 Months Ended								12 Months Ended
	Oct. 10, 2016 USD ($)	Oct. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($) shares	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) shares	Oct. 10, 2016 £ / shares shares	Oct. 09, 2016	Sep. 30, 2016
Business Acquisition [Line Items]
Cash component of the partial share alternative											$ 0	$ 0	$ 4,773
Proceeds from derivative financial instruments		$ 500									35	0	510
Total pre-tax cash from AB InBev and derivative financial instruments	$ 5,300
Purchase of AB InBev ordinary shares											12,800		1,578
Gain on AB InBev/SABMiller business combination			$ 0	$ 0	$ 0	$ (33)	$ 0	$ 37	$ 408	$ 0	$ (33)	445	$ 13,865
AB InBev [Member]
Business Acquisition [Line Items]
Ordinary shares owned/purchased (in shares) | shares				92,400,000									12,000,000
Equity method investment, ownership percentage (approximately)			10.10%								10.10%		10.20%	9.60%
Cash component of the partial share alternative	$ 4,800
Purchase of AB InBev ordinary shares													$ 1,600
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%
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											$ (33)	$ 445	13,900
After-tax accounting gain on AB InBev/SABMiller business combination (approximately)													$ 9,000
Restricted Shares [Member] | AB InBev [Member]
Business Acquisition [Line Items]
Restricted shares, lock-up period											5 years