Segment Reporting Information by Net Revenue and Operating Profit (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 13, 2020	Jun. 15, 2019	Jun. 13, 2020	Jun. 15, 2019
Segment Reporting Information [Line Items]
Reserve for Product Returns Novel Coronavirus (COVID-19) Impact	$ 9		$ 16
Net Revenue	15,945	$ 16,449	29,826	$ 29,333
Operating Profit	$ 2,319	$ 2,729	$ 4,243	$ 4,737
Disaggregation of Net Revenue - Beverages	45.00%	45.00%	45.00%	45.00%
Disaggregation of Net Revenue - Food/Snack	55.00%	55.00%	55.00%	55.00%
Disaggregation of beverage revenue from company-owned bottlers	40.00%	40.00%	40.00%	40.00%
Charges Related to Novel Coronavirus (COVID-19)	$ 378		$ 521
Accounts Receivable, Credit Loss Expense (reversal) Novel Coronavirus (COVID-19) Impact	4		72
Prepaid Incentives Novel Coronavirus (COVID-19 ) Impact	3		47
Inventory Write-down and Product Returns Novel Coronavirus (COVID-19) Impact	28		54
Employee Compensation Expense Novel Coronavirus (COVID-19) Impact	224		224
Employee Protection Costs Novel Coronavirus (COVID-19) Impact	86		86
Charges Related to Novel Coronavirus (COVID-19) Impact - Other	33		38
Frito Lay North America [Member]
Segment Reporting Information [Line Items]
Net Revenue	4,273	$ 4,010	8,347	$ 7,825
Operating Profit	1,278	1,249	2,480	2,408
Charges Related to Novel Coronavirus (COVID-19)	135		162
Accounts Receivable, Credit Loss Expense (reversal) Novel Coronavirus (COVID-19) Impact	(2)		19
Prepaid Incentives Novel Coronavirus (COVID-19 ) Impact	0		0
Inventory Write-down and Product Returns Novel Coronavirus (COVID-19) Impact	4		7
Employee Compensation Expense Novel Coronavirus (COVID-19) Impact	100		100
Employee Protection Costs Novel Coronavirus (COVID-19) Impact	33		33
Charges Related to Novel Coronavirus (COVID-19) Impact - Other	0		3
Quaker Foods North America [Member]
Segment Reporting Information [Line Items]
Net Revenue	664	540	1,298	1,134
Operating Profit	196	127	346	265
Charges Related to Novel Coronavirus (COVID-19)	7		9
Accounts Receivable, Credit Loss Expense (reversal) Novel Coronavirus (COVID-19) Impact	0		2
Prepaid Incentives Novel Coronavirus (COVID-19 ) Impact	0		0
Inventory Write-down and Product Returns Novel Coronavirus (COVID-19) Impact	0		0
Employee Compensation Expense Novel Coronavirus (COVID-19) Impact	6		6
Employee Protection Costs Novel Coronavirus (COVID-19) Impact	1		1
Charges Related to Novel Coronavirus (COVID-19) Impact - Other	0		0
PepsiCo Beverages North America [Member]
Segment Reporting Information [Line Items]
Net Revenue	4,970	5,322	9,808	9,832
Operating Profit	397	690	694	1,079
Charges Related to Novel Coronavirus (COVID-19)	137		245
Accounts Receivable, Credit Loss Expense (reversal) Novel Coronavirus (COVID-19) Impact	4		45
Prepaid Incentives Novel Coronavirus (COVID-19 ) Impact	2		46
Inventory Write-down and Product Returns Novel Coronavirus (COVID-19) Impact	7		29
Employee Compensation Expense Novel Coronavirus (COVID-19) Impact	84		84
Employee Protection Costs Novel Coronavirus (COVID-19) Impact	31		31
Charges Related to Novel Coronavirus (COVID-19) Impact - Other	9		10
Latin America [Member]
Segment Reporting Information [Line Items]
Net Revenue	1,567	1,886	2,877	3,127
Operating Profit	$ 219	$ 278	$ 450	$ 508
Disaggregation of Net Revenue - Beverages	10.00%	10.00%	10.00%	10.00%
Disaggregation of Net Revenue - Food/Snack	90.00%	90.00%	90.00%	90.00%
Charges Related to Novel Coronavirus (COVID-19)	$ 34		$ 34
Accounts Receivable, Credit Loss Expense (reversal) Novel Coronavirus (COVID-19) Impact	1		1
Prepaid Incentives Novel Coronavirus (COVID-19 ) Impact	0		0
Inventory Write-down and Product Returns Novel Coronavirus (COVID-19) Impact	6		6
Employee Compensation Expense Novel Coronavirus (COVID-19) Impact	16		16
Employee Protection Costs Novel Coronavirus (COVID-19) Impact	8		8
Charges Related to Novel Coronavirus (COVID-19) Impact - Other	3		3
Europe [Member]
Segment Reporting Information [Line Items]
Net Revenue	2,725	$ 3,000	4,564	$ 4,620
Operating Profit	$ 351	$ 339	$ 497	$ 454
Disaggregation of Net Revenue - Beverages	50.00%	55.00%	55.00%	55.00%
Disaggregation of Net Revenue - Food/Snack	50.00%	45.00%	45.00%	45.00%
Charges Related to Novel Coronavirus (COVID-19)	$ 45		$ 49
Accounts Receivable, Credit Loss Expense (reversal) Novel Coronavirus (COVID-19) Impact	0		4
Prepaid Incentives Novel Coronavirus (COVID-19 ) Impact	1		1
Inventory Write-down and Product Returns Novel Coronavirus (COVID-19) Impact	10		10
Employee Compensation Expense Novel Coronavirus (COVID-19) Impact	9		9
Employee Protection Costs Novel Coronavirus (COVID-19) Impact	8		8
Charges Related to Novel Coronavirus (COVID-19) Impact - Other	17		17
Africa, Middle East and South Asia [Member]
Segment Reporting Information [Line Items]
Net Revenue	983	$ 997	1,614	$ 1,576
Operating Profit	$ 59	$ 236	$ 193	$ 341
Disaggregation of Net Revenue - Beverages	40.00%	45.00%	35.00%	45.00%
Disaggregation of Net Revenue - Food/Snack	60.00%	55.00%	65.00%	55.00%
Charges Related to Novel Coronavirus (COVID-19)	$ 17		$ 17
Accounts Receivable, Credit Loss Expense (reversal) Novel Coronavirus (COVID-19) Impact	1		1
Prepaid Incentives Novel Coronavirus (COVID-19 ) Impact	0		0
Inventory Write-down and Product Returns Novel Coronavirus (COVID-19) Impact	1		1
Employee Compensation Expense Novel Coronavirus (COVID-19) Impact	7		7
Employee Protection Costs Novel Coronavirus (COVID-19) Impact	4		4
Charges Related to Novel Coronavirus (COVID-19) Impact - Other	4		4
Asia Pacific, Australia and New Zealand, and China Region [Member]
Segment Reporting Information [Line Items]
Net Revenue	763	$ 694	1,318	$ 1,219
Operating Profit	$ 189	$ 116	$ 331	$ 222
Disaggregation of Net Revenue - Beverages	25.00%	30.00%	25.00%	25.00%
Disaggregation of Net Revenue - Food/Snack	75.00%	70.00%	75.00%	75.00%
Charges Related to Novel Coronavirus (COVID-19)	$ 3		$ 5
Accounts Receivable, Credit Loss Expense (reversal) Novel Coronavirus (COVID-19) Impact	0		0
Prepaid Incentives Novel Coronavirus (COVID-19 ) Impact	0		0
Inventory Write-down and Product Returns Novel Coronavirus (COVID-19) Impact	0		1
Employee Compensation Expense Novel Coronavirus (COVID-19) Impact	2		2
Employee Protection Costs Novel Coronavirus (COVID-19) Impact	1		1
Charges Related to Novel Coronavirus (COVID-19) Impact - Other	0		1
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Profit	2,689	$ 3,035	4,991	$ 5,277
Corporate Unallocated [Member]
Segment Reporting Information [Line Items]
Operating Profit	$ (370)	$ (306)	$ (748)	$ (540)
United States and Canada [Member]
Segment Reporting Information [Line Items]
Fiscal Period Duration	84 days

Accounts Receivable, Credit Loss Expense (reversal) Novel Coronavirus (COVID-19) Impact

No definition available.

Name:	pep_AccountsReceivableCreditLossExpensereversalNovelCoronavirusCOVID19Impact
Namespace Prefix:	pep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Charges Related to Novel Coronavirus (COVID-19)

+ References

No definition available.

+ Details

Name:	pep_ChargesRelatedtoNovelCoronavirusCOVID19
Namespace Prefix:	pep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Charges Related to Novel Coronavirus (COVID-19) Impact - Other

+ References

No definition available.

+ Details

Name:	pep_ChargesRelatedtoNovelCoronavirusCOVID19ImpactOther
Namespace Prefix:	pep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Disaggregation of Net Revenue - Beverages

+ References

No definition available.

+ Details

Name:	pep_DisaggregationofNetRevenueBeverages
Namespace Prefix:	pep_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Disaggregation of Net Revenue - Food/Snack

+ References

No definition available.

+ Details

Name:	pep_DisaggregationofNetRevenueFoodSnack
Namespace Prefix:	pep_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Disaggregation of beverage revenue from Company-owned bottlers

+ References

No definition available.

+ Details

Name:	pep_Disaggregationofbeveragerevenuefromcompanyownedbottlers
Namespace Prefix:	pep_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Employee Compensation Expense Novel Coronavirus (COVID-19) Impact

+ References

No definition available.

+ Details

Name:	pep_EmployeeCompensationExpenseNovelCoronavirusCOVID19Impact
Namespace Prefix:	pep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Employee Compensation Costs Novel Coronavirus (COVID-19) Impact

+ References

No definition available.

+ Details

Name:	pep_EmployeeProtectionCostsNovelCoronavirusCOVID19Impact
Namespace Prefix:	pep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Inventory Write-down and Product Returns Novel Coronavirus (COVID-19) Impact

+ References

No definition available.

+ Details

Name:	pep_InventoryWritedownandProductReturnsNovelCoronavirusCOVID19Impact
Namespace Prefix:	pep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Prepaid Incentives Novel Coronavirus (COVID-19) Impact

+ References

No definition available.

+ Details

Name:	pep_PrepaidIncentivesNovelCoronavirusCOVID19Impact
Namespace Prefix:	pep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reserve for Product Returns Novel Coronavirus (COVID-19) Impact

+ References

No definition available.

+ Details

Name:	pep_ReserveforProductReturnsNovelCoronavirusCOVID19Impact
Namespace Prefix:	pep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

+ References

No definition available.

+ Details

Name:	us-gaap_FiscalPeriodDuration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

+ Details

Name:	us-gaap_OperatingIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pep_FritoLayNorthAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pep_QuakerFoodsNorthAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pep_PepsiCoBeveragesNorthAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=srt_LatinAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=srt_EuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pep_AfricaMiddleEastandSouthAsiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pep_AsiaPacificAustraliaandNewZealandandChinaRegionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=pep_UnitedStatesandCanadaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: