Restructuring and Impairment Charges Restructuring and Impairment Charges (Summary of 2019 Productivity Plan Charges) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 21, 2020	Mar. 23, 2019
Restructuring Cost and Reserve [Line Items]
Cash payments	$ (60)	$ (52)
2019 Productivity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	2,500
Restructuring and Related Cost, Expected Cash Expenditures	1,600
Liability as of December 28, 2019	149
Restructuring Charges	38	$ 26
Cash payments	(60)
Non-cash charges and translation	(6)
Liability as of March 21, 2020	$ 121
Net income attributable to PepsiCo per common share	$ 0.02	$ 0.02
Restructuring and Related Cost, Cost Incurred to Date	$ 546
2019 Productivity Plan [Member] | Frito Lay North America [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Percentage of Expect Costs	11.00%
Restructuring Charges	$ 5	$ 0
Restructuring and Related Cost, Cost Incurred to Date	$ 58
2019 Productivity Plan [Member] | Quaker Foods North America [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Percentage of Expect Costs	2.00%
Restructuring Charges	$ 1	0
Restructuring and Related Cost, Cost Incurred to Date	$ 8
2019 Productivity Plan [Member] | PepsiCo Beverages North America [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Percentage of Expect Costs	30.00%
Restructuring Charges	$ 3	6
Restructuring and Related Cost, Cost Incurred to Date	$ 94
2019 Productivity Plan [Member] | Latin America [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Percentage of Expect Costs	10.00%
Restructuring Charges	$ 5	0
Restructuring and Related Cost, Cost Incurred to Date	$ 76
2019 Productivity Plan [Member] | Europe [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Percentage of Expect Costs	25.00%
Restructuring Charges	$ 8	6
Restructuring and Related Cost, Cost Incurred to Date	$ 113
2019 Productivity Plan [Member] | Africa, Middle East and South Asia [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Percentage of Expect Costs	8.00%
Restructuring Charges	$ 2	8
Restructuring and Related Cost, Cost Incurred to Date	$ 43
2019 Productivity Plan [Member] | Asia Pacific, Australia and New Zealand, and China Region [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Percentage of Expect Costs	5.00%
Restructuring Charges	$ 0	3
Restructuring and Related Cost, Cost Incurred to Date	$ 49
Corporate Unallocated [Member] | 2019 Productivity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Percentage of Expect Costs	9.00%
Restructuring Charges	$ 8	8
Restructuring and Related Cost, Cost Incurred to Date	$ 62
Severance and Other Employee Costs | 2019 Productivity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Percentage of Expect Costs	70.00%
Liability as of December 28, 2019	$ 128
Restructuring Charges	22	(3)
Cash payments	(31)
Non-cash charges and translation	(9)
Liability as of March 21, 2020	110
Restructuring and Related Cost, Cost Incurred to Date	$ 308
Asset Impairments | 2019 Productivity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Percentage of Expect Costs	15.00%
Liability as of December 28, 2019	$ 0
Restructuring Charges	1	8
Cash payments	0
Non-cash charges and translation	(1)
Liability as of March 21, 2020	0
Restructuring and Related Cost, Cost Incurred to Date	$ 93
Other Costs | 2019 Productivity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Percentage of Expect Costs	15.00%
Liability as of December 28, 2019	$ 21
Restructuring Charges	15	21
Cash payments	(29)
Non-cash charges and translation	4
Liability as of March 21, 2020	11
Restructuring and Related Cost, Cost Incurred to Date	145
Cost of sales | 2019 Productivity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2	8
Selling, general and administrative expenses | 2019 Productivity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	30	23
Other pension and retiree medical benefits expense/(income) | 2019 Productivity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	6	(5)
Restructuring and Related Cost, Cost Incurred to Date	43
After-tax amount | 2019 Productivity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	32	23
Restructuring, Settlement and Impairment Provisions, less Other pension and retiree medical benefits expense [Member] | 2019 Productivity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	32	$ 31
Restructuring and Related Cost, Cost Incurred to Date	$ 503