Basic and Diluted Net Income Attributable to PepsiCo (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 23, 2019	Mar. 24, 2018
Earnings Per Share [Abstract]
Net income attributable to PepsiCo		$ 1,413	$ 1,343
Preferred Stock [Abstract]
Redemption premium		0	(2)
Net income available for PepsiCo common shareholders - Value		$ 1,413	$ 1,341
Net income available for PepsiCo common shareholders - Shares	[1]	1,406	1,420
Earnings Per Share, Basic		$ 1.01	$ 0.94
Dilutive Securities [Abstract]
Stock options and RSUs - Shares	[1]	7	10
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units		$ 0	$ 0
Dilutive Securities, Effect on Basic Earnings Per Share, ESOP Convertible Preferred Stock		$ 0	$ 2
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock	[1]	0	0
Net Income (Loss) Available to Common Stockholders, Diluted		$ 1,413	$ 1,343
Weighted Average Number of Shares Outstanding, Diluted	[1]	1,413	1,430
Earnings Per Share, Diluted		$ 1.00	$ 0.94

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