Restructuring and Cost Reduction Activities Project K Total Expected Program Costs Narrative (Details) $ in Millions	12 Months Ended
	Dec. 28, 2019 USD ($)
Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related activities cash implementation costs recovery time frame	3 years
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related activities cash implementation costs recovery time frame	5 years
Maximum | Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 1,600
Estimated after-tax cash costs for the program amount	1,200
Maximum | Asset related costs | Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	500
Maximum | Employee related cost | Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	400
Maximum | Other cost | Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 700