Accumulated Other Comprehensive Loss Attributable to Pepsico (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Currency translation adjustment	$ (12,309)	$ (11,940)	$ (11,290)	$ (11,918)
Unamortized pension and retiree medical, net of tax (b)	(2,750)	(3,520)	(2,988)	(3,271)
Other	2	(20)	(19)	(17)
Accumulated other comprehensive loss attributable to PepsiCo	(14,898)	(15,476)	(14,300)	(15,119)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(322)	(710)	636
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	1,001	(676)	379
Other Comprehensive Income, Other, Before Tax	22	(1)	(2)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	901	(1,377)	896
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	(340)	(710)	636
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	702	(1,141)	(89)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	22	(1)	(2)
OCI, before Reclassifications, before Tax, Attributable to Parent	632	(1,726)	414
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	18	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	299	465	468
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	269	349	482
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(47)	60	(8)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(231)	144	(96)
Other Comprehensive Income, Other, Taxes	0	0	0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(323)	201	(77)
Net of taxes decrease to opening balance of accumulated other comprehensive loss attributable to Pepsico	1,283	1,514	1,370	1,466
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	248	126	(131)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(48)	(116)	14
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	200	10	(117)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent	(45)	(3)	27
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	$ 159	$ 4	$ (3)	$ 87