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Net Income Attributable to PepsiCo per Common Share Out-of-the-money options excluded from the calculation of diluted earnings per common share (Details) - $ / shares | 3 Months Ended
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Mar. 21, 2020 | Mar. 23, 2019
Out-of-the-money options [Abstract] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 1.2
Antidilutive Securities Excluded From Computation Of Earnings Per Share, Average Exercise per Share Amount | $ 0 | $ 115.98

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- Definition Weighted-average exercise price of out-of-the-money options excluded from the computation of earnings per share. + References No definition available. + Details
Name: | pep_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAverageExerciseperShareAmount
Namespace Prefix: | pep_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Out-of-the-money options [Abstract] + References No definition available. + Details
Name: | pep_OutofthemoneyoptionsAbstract
Namespace Prefix: | pep_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration