Background and Basis of Presentation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended				6 Months Ended		12 Months Ended	36 Months Ended
	Jan. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jun. 30, 2018	May 31, 2018	Jul. 31, 2017	Dec. 31, 2016	Oct. 31, 2016	Jul. 31, 2015
Equity, Class of Treasury Stock [Line Items]
Common stock, increase (decrease) in dividend rate, percentage			6.10%
Dividends declared (usd per share)		$ 0.7	$ 0.7	$ 0.66	$ 0.61	$ 1.4	$ 1.22	$ 2.54
Annualized dividend rate						$ 2.8
Repurchase of common stock (shares)		7.6			14.4	15.6	22.1
Aggregate cost of shares repurchased		$ 437,000,000			$ 1,049,000,000	$ 950,000,000	$ 1,600,000,000	$ 2,917,000,000
Average price of repurchased shares, per share (usd per share)		$ 57.65			$ 72.85	$ 61.07	$ 72.47
Net periodic benefit income, excluding service cost		$ 9,000,000			$ 11,000,000	$ 16,000,000	$ 19,000,000
AB InBev [Member]
Equity, Class of Treasury Stock [Line Items]
Equity method investment, ownership percentage (approximately)		10.10%				10.10%			10.10%
July 2015 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Planned share repurchase program											$ 4,000,000,000		$ 3,000,000,000	$ 1,000,000,000
Repurchase of common stock (shares)	0.3								58.7
Average price of repurchased shares, per share (usd per share)	$ 71.68								$ 68.15
January 2018 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Planned share repurchase program	$ 1,000,000,000									$ 2,000,000,000
Repurchase of common stock (shares)		7.6				15.3
Aggregate cost of shares repurchased		$ 437,000,000				$ 932,000,000
Average price of repurchased shares, per share (usd per share)		$ 57.65				$ 60.89
Stock repurchase program, remaining authorized repurchase amount		$ 1,068,000,000				$ 1,068,000,000			$ 1,068,000,000
Accounting Standards Update 2016-18 [Member]
Equity, Class of Treasury Stock [Line Items]
Restricted cash		$ 93,000,000		$ 61,000,000	79,000,000	$ 93,000,000	79,000,000	$ 61,000,000	$ 93,000,000			$ 82,000,000
Cost of Sales [Member] | Account Standards Update 2017-07 [Member]
Equity, Class of Treasury Stock [Line Items]
Net periodic benefit income, excluding service cost					(5,000,000)		(8,000,000)
Marketing, Adminstration and Research Costs [Member] | Account Standards Update 2017-07 [Member]
Equity, Class of Treasury Stock [Line Items]
Net periodic benefit income, excluding service cost					$ (6,000,000)		$ (11,000,000)