Restructuring and Cost Reduction Activities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring plan, number of years	5 years
Restructuring and related costs since inception of program	$ 1,296
Restructuring charges	142	$ 52
Exit cost reserves	204		$ 131
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	15	18
Selling General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	127	34
Employee related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	479
Restructuring charges	111	14
Exit cost reserves	193		102
Asset related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	202
Restructuring charges	10	10
Exit cost reserves	0		0
Asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	155
Restructuring charges	0	0
Exit cost reserves	0		0
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	460
Restructuring charges	21	28
Exit cost reserves	11		$ 29
Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	1,258
Project K | Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	6
Project K | Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	705
Project K | Selling General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	547
Project K | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	1,500
Project K | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	1,600
Estimated after-tax cash costs for program, including incremental capital investments	$ 1,100
Project K | U.S. Morning Foods
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation	13.00%
Project K | U.S. Snacks
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation	35.00%
Project K | U.S. Specialty
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation	1.00%
Project K | North America Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation	11.00%
Project K | Europe
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation	21.00%
Project K | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation	1.00%
Project K | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation	6.00%
Project K | Employee related costs | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	$ 500
Project K | Asset related costs | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	500
Project K | Other costs | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	600
Zero Based Budgeting
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	38
Restructuring Charges	1	7
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	166
Restructuring charges	$ 6	$ 2
Corporate | Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation	12.00%