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Basic and Diluted Net Income Attributable to PepsiCo (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 20, 2021
Mar. 21, 2020
Preferred Stock [Abstract]    
Net Income (Loss) Available to Common Stockholders, Basic $ 1,714 $ 1,338
Weighted Average Number of Shares Outstanding, Basic 1,380 1,390
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 7 6
Net Income (Loss) Attributable to Parent $ 1,714 $ 1,338
Earnings Per Share, Basic $ 1.24 $ 0.96
Dilutive Securities [Abstract]    
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units $ 0 $ 0
Net Income (Loss) Available to Common Stockholders, Diluted $ 1,714 $ 1,338
Weighted Average Number of Shares Outstanding, Diluted 1,387 1,396
Earnings Per Share, Diluted $ 1.24 $ 0.96