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. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	$ 0	$ (9)	$ (17)
Amortization and settlement of (losses)/gains	238	169	216
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	227	308	19
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	465	468	218
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	(101)	(102)	(45)
Remeasurement of net liabilities and translation	364	366	173
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	(116)	14	111
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	29	(2)	(27)
Net derivative losses	(87)	12	84
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	277	378	301
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	0	0	44
Cash Flow Hedges
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(116)	14
Foreign Exchange Forward Contracts | Cash Flow Hedges
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(43)	3
Foreign Exchange Forward Contracts | Revenue Benchmark [Member] | Cash Flow Hedges
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	1	(1)
Foreign Exchange Forward Contracts | Cost of sales | Cash Flow Hedges
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(43)	2	(7)
Interest Rate Contracts | Cash Flow Hedges
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(129)	7
Interest Rate Contracts | Interest Expense | Cash Flow Hedges
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(129)	7	119
Commodity Contracts | Cash Flow Hedges
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	56	4
Commodity Contracts | Cost of sales | Cash Flow Hedges
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	50	3	3
Commodity Contracts | Selling, general and administrative expenses | Cash Flow Hedges
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 6	$ 1	$ (3)