Basic and Diluted Net Income Attributable to PepsiCo (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 13, 2020	Jun. 15, 2019	Jun. 13, 2020	Jun. 15, 2019
Preferred Stock [Abstract]
Net Income (Loss) Available to Common Stockholders, Basic	$ 1,646	$ 2,035	$ 2,984	$ 3,448
Weighted Average Number of Shares Outstanding, Basic	1,387	1,401	1,389	1,403
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	6	8	6	8
Net Income (Loss) Attributable to Parent	$ 1,646	$ 2,035	$ 2,984	$ 3,448
Earnings Per Share, Basic	$ 1.19	$ 1.45	$ 2.15	$ 2.46
Dilutive Securities [Abstract]
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units	$ 0	$ 0	$ 0	$ 0
Net Income (Loss) Available to Common Stockholders, Diluted	$ 1,646	$ 2,035	$ 2,984	$ 3,448
Weighted Average Number of Shares Outstanding, Diluted	1,393	1,409	1,395	1,411
Earnings Per Share, Diluted	$ 1.18	$ 1.44	$ 2.14	$ 2.44