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. 12, 2021	Jun. 13, 2020	Jun. 12, 2021	Jun. 13, 2020
Preferred Stock [Abstract]
Net Income (Loss) Available to Common Stockholders, Basic	$ 2,358	$ 1,646	$ 4,072	$ 2,984
Weighted Average Number of Shares Outstanding, Basic	1,382	1,387	1,381	1,389
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	6	6	6	6
Net Income (Loss) Attributable to Parent	$ 2,358	$ 1,646	$ 4,072	$ 2,984
Earnings Per Share, Basic	$ 1.71	$ 1.19	$ 2.95	$ 2.15
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	$ 2,358	$ 1,646	$ 4,072	$ 2,984
Weighted Average Number of Shares Outstanding, Diluted	1,388	1,393	1,387	1,395
Earnings Per Share, Diluted	$ 1.70	$ 1.18	$ 2.94	$ 2.14