Restructuring and Cost Reduction Activities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015	Jan. 02, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring plan, number of years			5 years
Restructuring and related costs since inception of program	$ 993		$ 993
Restructuring charges	40	$ 85	164	$ 243
Exit cost reserves	67		67		$ 88
Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring charges		2		4
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	12	57	66	154
Selling General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	28	26	98	85
Employee related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	285		285
Restructuring charges	6	31	26	64
Exit cost reserves	35		35		55
Asset related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	178		178
Restructuring charges	5	15	32	62
Exit cost reserves	0		0		0
Asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	121		121
Restructuring charges	0	0	16	18
Exit cost reserves	0		0		0
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	409		409
Restructuring charges	29	39	90	99
Exit cost reserves	32		$ 32		$ 33
Project K
Restructuring Cost and Reserve [Line Items]
Restructuring plan, number of years			4 years
Restructuring and related costs since inception of program	960		$ 960
Project K | Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	6		6
Project K | Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	583		583
Project K | Selling General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	371		371
Project K | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	1,200		1,200
Estimated after-tax cash costs for program, including incremental capital investments			900
Project K | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	1,400		1,400
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			18.00%
Project K | U.S. Snacks
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			17.00%
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			10.00%
Project K | Europe
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			17.00%
Project K | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			2.00%
Project K | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			6.00%
Project K | Employee related costs | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	400		$ 400
Project K | Employee related costs | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	450		450
Project K | Asset related costs | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	400		400
Project K | Asset related costs | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	450		450
Project K | Other costs | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	400		400
Project K | Other costs | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	500		500
Zero Based Budgeting
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	33		33
Restructuring Charges	4		21
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	140		140
Restructuring charges	$ 10	$ 13	$ 19	$ 47
Corporate | Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			29.00%