Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						4 Months Ended			12 Months Ended
	Sep. 07, 2019	Jun. 15, 2019	Mar. 23, 2019	Sep. 08, 2018	Jun. 16, 2018	Mar. 24, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Selected Quarterly Financial Data [Line Items]
Net Revenue	$ 17,188	$ 16,449	$ 12,884	$ 16,485	$ 16,090	$ 12,562	$ 20,640	$ 19,524		$ 67,161	$ 64,661	$ 63,525
Gross Profit	9,494	9,045	7,196	8,958	8,827	6,907	11,294	10,588		37,029	35,280	34,729
Operating Profit	2,855	2,729	2,008	2,844	3,028	1,807	2,699	2,431		10,291	10,110	10,276
Mark-to-market net impact	(4)	(6)	60	(29)	3	(31)	62	(106)
Restructuring and impairment charges	(98)	(158)	(26)	(35)	(32)	(12)	(88)	(229)		(373)	(316)	(311)
Inventory fair value adjustments and merger and integration costs	(7)	(24)	(15)	0	0	0	(9)	(75)		(55)	(75)
Pension-related settlement charge	0	0	0	0	0	0	273	0
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)	0	0	29	(76)	(777)	(1)	(21)	882	$ (2,500)	8	28
Gains on sale of assets	0	32	0	37	9	18	45	12
Other net tax benefits	0	0	0	364	314	0	0	4,386
Charges related to cash tender and exchange offers	0	0	0	0	0	0	0	(253)			253
Tax reform bonus	0	0	0	0	0	(87)	0	0
Gains on beverage refranchising	0	0	0	0	144	0	0	58
Provision for/(benefit from) income taxes	559	524	446	188	1,070	304	430	(4,932)		1,959	(3,370)	4,694
Net Income Attributable to PepsiCo	$ 2,100	$ 2,035	$ 1,413	$ 2,498	$ 1,820	$ 1,343	$ 1,766	$ 6,854		$ 7,314	$ 12,515	$ 4,857
Basic net income attributable to PepsiCo per common share	$ 1.50	$ 1.45	$ 1.01	$ 1.77	$ 1.28	$ 0.94	$ 1.27	$ 4.86		$ 5.23	$ 8.84	$ 3.40
Diluted net income attributable to PepsiCo per common share	1.49	1.44	1.00	1.75	1.28	0.94	1.26	4.83		5.20	8.78	3.38
Common Stock, Dividends, Per Share, Declared	$ 0.955	$ 0.955	$ 0.9275	$ 0.9275	$ 0.9275	$ 0.805	$ 0.955	$ 0.9275		$ 3.7925	$ 3.5875	$ 3.1675
International reorganization DTA											$ 4,300
Federal and International Audit Settlements											717
Europe [Member]
Selected Quarterly Financial Data [Line Items]
Net Revenue										$ 11,728	10,973	$ 10,522
Operating Profit										1,327	1,256	1,199
Inventory fair value adjustments and merger and integration costs										(46)	(57)
Gains on beverage refranchising											58
Asia Pacific, Australia and New Zealand, and China Region [Member]
Selected Quarterly Financial Data [Line Items]
Net Revenue										2,919	2,794	2,884
Operating Profit										477	619	401
Gains on beverage refranchising											144
Africa, Middle East and South Asia [Member]
Selected Quarterly Financial Data [Line Items]
Net Revenue										3,651	3,657	3,674
Operating Profit										671	661	789
Inventory fair value adjustments and merger and integration costs										(7)
Gains on sale of assets											12
Gains on beverage refranchising												140
Frito Lay North America [Member]
Selected Quarterly Financial Data [Line Items]
Net Revenue										17,078	16,346	15,798
Operating Profit										5,258	5,008	4,793
Gains on sale of assets										31
Tax reform bonus											(44)
Quaker Foods North America [Member]
Selected Quarterly Financial Data [Line Items]
Net Revenue										2,482	2,465	2,503
Operating Profit										544	637	640
Tax reform bonus											(2)
PepsiCo Beverages North America [Member]
Selected Quarterly Financial Data [Line Items]
Net Revenue										21,730	21,072	20,936
Operating Profit										2,179	2,276	$ 2,700
Gains on sale of assets										46	64
Tax reform bonus											$ (41)
Domestic - Plan A [Member]
Selected Quarterly Financial Data [Line Items]
Pension-related settlement charge										220
Domestic-Plan I [Member]
Selected Quarterly Financial Data [Line Items]
Pension-related settlement charge										$ 53