Restructuring and Cost Reduction Activities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 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	$ 953		$ 953
Restructuring charges	72	$ 90	124	$ 158
Exit cost reserves	70		70		$ 88
Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring charges				2
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	36	65	54	97
Selling General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	36	25	70	59
Employee related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	279		279
Restructuring charges	6	16	20	33
Exit cost reserves	40		40		55
Asset related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	173		173
Restructuring charges	17	24	27	47
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	16	18	16	18
Exit cost reserves	0		0		0
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	380		380
Restructuring charges	33	32	61	60
Exit cost reserves	30		$ 30		$ 33
Project K
Restructuring Cost and Reserve [Line Items]
Restructuring plan, number of years			4 years
Restructuring and related costs since inception of program	924		$ 924
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	571		571
Project K | Selling General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	347		347
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	29		29
Restructuring Charges	12		17
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	130		130
Restructuring charges	$ 7	$ 14	$ 9	$ 34
Corporate | Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			29.00%