Accumulated Other Comprehensive Loss Attributable to Pepsico (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 29, 2018		Dec. 30, 2017		Dec. 31, 2016	Dec. 26, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Currency translation adjustment		$ (11,918)		$ (10,277)		$ (11,386)	$ (11,080)
Cash flow hedges, net of tax		87		47		83	37
Unamortized pension and retiree medical, net of tax (b)	[1]	(3,271)		(2,804)		(2,645)	(2,329)
Unrealized gain on securities, net of tax		2		(4)		64	88
Other		(19)		(19)		(35)	(35)
Accumulated other comprehensive loss attributable to PepsiCo		(15,119)		(13,057)		(13,919)	(13,319)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax		(1,664)	[2]	1,049	[3]	(313)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax		(1,620)		1,049		(313)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax		50		(41)		76
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax		(595)		(217)		(343)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax		6		(74)		(43)
Other Comprehensive Income, Other, Before Tax		0		0		0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent		(2,159)		717		(623)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax		(61)		130		(74)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax		(813)		(375)		(750)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax		6		25		(43)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		0		0		0
OCI, before Reclassifications, before Tax, Attributable to Parent		(2,532)		829		(1,180)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax		44		0		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		111		(171)		150
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax		218		158		407
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax		0		(99)		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0		0		0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent		373		(112)		557
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax		(21)		60		7
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax		(10)		5		(30)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax		128		58		27
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax				6		19
Other Comprehensive Income, Other, Taxes		0		16		0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent		97		145		23
Net of taxes decrease to opening balance of accumulated other comprehensive loss attributable to Pepsico		$ 1,466		$ 1,338		$ 1,280	$ 1,253

[1] Pension and retiree medical amounts are net of taxes of $1,253 million as of December 26, 2015, $1,280 million as of December 31, 2016, $1,338 million as of December 30, 2017 and $1,466 million

[2] Currency translation adjustment primarily reflects the depreciation of the Russian ruble, Canadian dollar, Pound sterling and Brazilian real.

[3] Currency translation adjustment primarily reflects the appreciation of the euro, Russian ruble, Pound sterling and Canadian dollar.