Accumulated Other Comprehensive Loss Attributable to Pepsico Reclassification of Accumulated Other Comprehensive Loss to the Condensed Consolidated Statement of Income (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Proceeds from Divestiture of Businesses		$ 44	$ 0	$ 0
Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Post retirement Plans Taxes		1,466	1,338	1,280	$ 1,253
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Reclassification of net losses to net income, pre-tax amount		111	(171)	150
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax		(27)	64	(63)
Net derivative losses		84	(107)	87
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	[1]	(17)	(24)	(39)
Amortization and settlement of (losses)/gains	[1]	216	167	209
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	[1]	19	15	237
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax		218	158	407
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax		(45)	(44)	(144)
Remeasurement of net liabilities and translation		173	114	263
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax		0	(99)	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax		0	10	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		0	(89)	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		301	(82)	350
Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[2]	111	(171)
Foreign Exchange Forward Contracts | Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[2]	(8)	10
Foreign Exchange Forward Contracts | Sales Revenue, Net [Member] | Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		1	0	(2)
Foreign Exchange Forward Contracts | Cost of Sales | Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		7	(10)	46
Interest Rate Contracts | Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[2]	119	(184)
Interest Rate Contracts | Interest Expense | Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(119)	184	(187)
Commodity Contracts | Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[2]	0	3
Commodity Contracts | Cost of Sales | Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(3)	(4)	(3)
Commodity Contracts | Selling, General and Administrative Expenses | Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 3	$ 1	$ (4)

[1] Amount Reclassified from Accumulated Other Comprehensive Loss Affected Line Item in the Income Statement 2018 2017 2016 Currency translation: Divestitures$44 $— $— Selling, general and administrative expenses Cash flow hedges: Foreign exchange contracts$(1) $— $2 Net revenue Foreign exchange contracts(7) 10 (46) Cost of sales Interest rate derivatives119 (184) 187 Interest expense Commodity contracts3 4 3 Cost of sales Commodity contracts(3) (1) 4 Selling, general and administrative expenses Net losses/(gains) before tax111 (171) 150 Tax amounts(27) 64 (63) Net losses/(gains) after tax$84 $(107) $87 Pension and retiree medical items: Amortization of net prior service credit $(17) $(24) $(39) Other pension and retiree medical benefits income/(expense) Amortization of net losses 216 167 209 Other pension and retiree medical benefits income/(expense) Settlement/curtailment 19 15 237 Other pension and retiree medical benefits income/(expense) Net losses before tax218 158 407 Tax amounts(45) (44) (144) Net losses after tax$173 $114 $263 Available-for-sale securities: Sale of Britvic securities$— $(99) $— Selling, general and administrative expensesTax amount— 10 — Net gain after tax$— $(89) $— Total net losses/(gains) reclassified for the year, net of tax$301 $(82) $350

[2] Foreign exchange derivative losses/gains are primarily included in cost of sales. Interest rate derivative losses/gains are included in interest expense. Commodity derivative losses/gains are included in either cost of sales or selling, general and administrative expenses, depending on the underlying commodity.