Accumulated Other Comprehensive Loss Attributable to Pepsico (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Currency translation adjustment	$ (11,290)	$ (11,918)	$ (10,277)	$ (11,386)
Cash flow hedges, net of tax	(3)	87	47	83
Unamortized pension and retiree medical, net of tax (b)	(2,988)	(3,271)	(2,804)	(2,645)
Unrealized gain on securities, net of tax	0	2	(4)	64
Other	(19)	(19)	(19)	(35)
Accumulated other comprehensive loss attributable to PepsiCo	(14,300)	(15,119)	(13,057)	(13,919)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	636	(1,664)	1,049
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	636	(1,620)	1,049
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	(117)	50	(41)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	379	(595)	(217)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	(2)	6	(74)
Other Comprehensive Income, Other, Before Tax	0	0	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	896	(2,159)	717
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(131)	(61)	130
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	(89)	(813)	(375)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax	(2)	6	25
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	0	0
OCI, before Reclassifications, before Tax, Attributable to Parent	414	(2,532)	829
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	0	44	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	14	111	(171)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	468	218	158
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	0	0	(99)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	482	373	(112)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(8)	(21)	60
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	27	(10)	5
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(96)	128	58
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax	0	0	6
Other Comprehensive Income, Other, Taxes	0	0	16
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(77)	97	145
Net of taxes decrease to opening balance of accumulated other comprehensive loss attributable to Pepsico	$ 1,370	$ 1,466	$ 1,338	$ 1,280