Basic and Diluted Net Income Attributable to PepsiCo (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 24, 2018	Mar. 25, 2017
Earnings Per Share [Abstract]
Net income attributable to PepsiCo		$ 1,343	$ 1,318
Preferred Stock [Abstract]
Redemption premium		(2)	(2)
Net income available for PepsiCo common shareholders - Value		$ 1,341	$ 1,316
Net income available for PepsiCo common shareholders - Shares	[1]	1,420	1,428
Basic net income attributable to PepsiCo per common share (in dollars per share)		$ 0.94	$ 0.92
Dilutive Securities [Abstract]
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities		$ 0	$ 0
Stock options and RSUs - Shares	[1]	10	11
ESOP convertible preferred stock - Value		$ 2	$ 2
ESOP convertible preferred stock - Shares	[1]	0	1
Diluted shares - Shares	[1]	1,430	1,440
Diluted net income attributable to PepsiCo per common share (in dollars per share)		$ 0.94	$ 0.91

[1] Weighted-average common shares outstanding (in millions)