Restructuring and Cost Reduction Activities Narrative (Details) - USD ($) $ in Millions	6 Months Ended		9 Months Ended	12 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Oct. 01, 2016	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring plan, number of years			5 years
Restructuring and related costs since inception of program				$ 1,154
Restructuring charge				325	$ 323
Restructuring and Related Cost, Incurred Cost				325	323	$ 298
Exit cost reserve				131	88	110
Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost					4	2
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				173	191	152
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				152	128	144
U.S. Morning Foods
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				241
Restructuring and Related Cost, Incurred Cost				23	58	60
U.S. Snacks
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				202
Restructuring and Related Cost, Incurred Cost				76	50	57
U.S. Specialty
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				19
Restructuring and Related Cost, Incurred Cost				8	5	3
North America Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				128
Restructuring and Related Cost, Incurred Cost				38	63	18
Europe
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				299
Restructuring and Related Cost, Incurred Cost				126	74	80
Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				24
Restructuring and Related Cost, Incurred Cost				8	4	8
Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				81
Restructuring and Related Cost, Incurred Cost				7	13	37
Asset related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				192
Restructuring charge				46	103
Restructuring and Related Cost, Incurred Cost				46	103	37
Exit cost reserve				0	0	0
Employee related cost
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				368
Restructuring charge				109	62
Restructuring and Related Cost, Incurred Cost				109	62	90
Exit cost reserve				102	55	96
Other cost
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				439
Restructuring charge				120	140
Restructuring and Related Cost, Incurred Cost				120	140	150
Exit cost reserve				29	33	14
Asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				155
Restructuring charge				50	18
Restructuring and Related Cost, Incurred Cost				50	18	21
Exit cost reserve				0	0	0
Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				1,117
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				690
Project K | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				421
Project K | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost				1,500
Project K | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, 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 | Asset related costs | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost				$ 500
Project K | Employee related cost | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost				500
Project K | Other cost | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost				600
ZBB
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				37
Restructuring and Related Cost, Incurred Cost	$ 25	$ 12
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program				160
Restructuring and Related Cost, Incurred Cost				$ 39	$ 56	$ 35
Corporate | Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost expected cost allocation				12.00%