| Document and Entity Information Document | May 01, 2019 |
| Schedule of Securities by Class [Line Items] | |
| Entity Registrant Name | PEPSICO INC |
| Entity Address, Address Line One | 700 Anderson Hill Road, Purchase, New York |
| Entity Incorporation, State Country Name | North Carolina |
| Document Type | 8-K |
| Trading Symbol | PEP |
| Name of Exchange on which Security is Registered | The Nasdaq Stock Market LLC |
| Document Creation Date | May 1, 2019 |
| Local Phone Number | (914) 253-2000 |
| Entity File Number | 1-1183 |
| Entity Address, Postal Zip Code | 10577 |
| Entity Central Index Key | 0000077476 |
| Current Fiscal Year End Date | --12-28 |
| Document Period End Date | May 1, 2019 |
| Document Fiscal Year Focus | 2019 |
| Amendment Flag | false |
| Entity Emerging Growth Company | false |
| Entity Tax Identification Number | 131584302 |
| Entity Information, Former Legal or Registered Name | N/A |
| Common stock, par value 1-2/3 cents per share [Member] | |
| Schedule of Securities by Class [Line Items] | |
| Class of Security | Common Stock, par value 1-2/3 cents per share |
| Two Point Five Percent Notes Due 2022 [Member] | |
| Schedule of Securities by Class [Line Items] | |
| Trading Symbol | PEP22a |
| Class of Security | 2.500% Senior Notes Due 2022 |
| One Point Seven Five Percent Notes Due 2021 [Member] | |
| Schedule of Securities by Class [Line Items] | |
| Trading Symbol | PEP21a |
| Class of Security | 1.750% Senior Notes Due 2021 |
| Two Point Six Two Five Percent Notes Due 2026 [Member] | |
| Schedule of Securities by Class [Line Items] | |
| Trading Symbol | PEP26 |
| Class of Security | 2.625% Senior Notes Due 2026 |
| Zero Point Eight Seven Five Percent Notes Due 2028 [Member] | |
| Schedule of Securities by Class [Line Items] | |
| Trading Symbol | PEP28 |
| Class of Security | 0.875% Senior Notes Due 2028 |
| Zero Point Seven Five Percent Notes Due 2027 [Member] | |
| Schedule of Securities by Class [Line Items] | |
| Trading Symbol | PEP27 |
| Class of Security | 0.750% Senior Notes Due 2027 |
| One Point One Two Five Percent Notes Due 2031 [Member] | |
| Schedule of Securities by Class [Line Items] | |
| Trading Symbol | PEP31 |
| Class of Security | 1.125% Senior Notes Due 2031 |
