Restructuring and Cost Reduction Activities Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring and related activities cash implementation costs recovery time frame	5 years
Restructuring and related costs since inception of program	$ 1,417
Restructuring and Related Cost, Incurred Cost	263	$ 325	$ 323
Exit cost reserve	160	131	88
Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			4
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	46	173	191
SGA [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	217	152	128
U.S. Morning Foods
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	259
Restructuring and Related Cost, Incurred Cost	18	23	58
U.S. Snacks
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	511
Restructuring and Related Cost, Incurred Cost	309	76	50
U.S. Specialty
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	21
Restructuring and Related Cost, Incurred Cost	2	8	5
North America Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	144
Restructuring and Related Cost, Incurred Cost	16	38	63
Europe
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	339
Restructuring and Related Cost, Incurred Cost	40	126	74
Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	33
Restructuring and Related Cost, Incurred Cost	9	8	4
Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	92
Restructuring and Related Cost, Incurred Cost	11	7	13
Asset related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	269
Restructuring and Related Cost, Incurred Cost	77	46	103
Exit cost reserve	0	0	0
Employee related cost
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	534
Restructuring and Related Cost, Incurred Cost	177	108	63
Exit cost reserve	97	102	55
Pension curtailment (gain) loss, net
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	(137)
Restructuring and Related Cost, Incurred Cost	(148)	1	(1)
Exit cost reserve	0	0	0
Other cost
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	596
Restructuring and Related Cost, Incurred Cost	157	120	140
Exit cost reserve	63	29	33
Asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	155
Restructuring and Related Cost, Incurred Cost	0	50	18
Exit cost reserve	0	0	0
Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	1,377
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	736
Project K | SGA [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	635
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	17.00%
Project K | U.S. Snacks
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost expected cost allocation	34.00%
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	13.00%
Project K | Europe
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost expected cost allocation	22.00%
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 | 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	40
Restructuring and Related Cost, Incurred Cost	3	25	12
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	18
Restructuring and Related Cost, Incurred Cost	$ (142)	$ 39	$ 56
Corporate | Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost expected cost allocation	5.00%