Net Income Attributable to PepsiCo per Common Share (Basic and Diluted Net Income Attributable to PepsiCo per Common Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 2,100	$ 2,035	$ 1,413	$ 2,498	$ 1,820	$ 1,343	$ 1,766	$ 6,854	$ 7,314	$ 12,515	$ 4,857
Redemption premium									0	(2)	(4)
Net income available for PepsiCo common shareholders - Value									$ 7,314	$ 12,513	$ 4,853
Net income available for PepsiCo common stockholders - Shares									1,399	1,415	1,425
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
Stock options and RSUs - Shares									8	10	12
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units									$ 0	$ 0	$ 0
ESOP convertible preferred stock - Value									$ 0	$ 2	$ 4
ESOP convertible preferred stock - Shares									0	0	1
Diluted shares - Value									$ 7,314	$ 12,515	$ 4,857
Diluted shares - Shares									1,407	1,425	1,438
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