Restructuring and Cost Reduction Activities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 263	$ 325	$ 323
Program cost to date	1,417
Employee related cost
Restructuring Cost and Reserve [Line Items]
Restructuring charge	177	108	63
Program cost to date	534
Pension curtailment (gain) loss, net
Restructuring Cost and Reserve [Line Items]
Restructuring charge	(148)	1	(1)
Program cost to date	(137)
Asset related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charge	77	46	103
Program cost to date	269
Asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring charge	0	50	18
Program cost to date	155
Other cost
Restructuring Cost and Reserve [Line Items]
Restructuring charge	157	120	140
Program cost to date	596
U.S. Morning Foods
Restructuring Cost and Reserve [Line Items]
Restructuring charge	18	23	58
Program cost to date	259
U.S. Snacks
Restructuring Cost and Reserve [Line Items]
Restructuring charge	309	76	50
Program cost to date	511
U.S. Specialty
Restructuring Cost and Reserve [Line Items]
Restructuring charge	2	8	5
Program cost to date	21
North America Other
Restructuring Cost and Reserve [Line Items]
Restructuring charge	16	38	63
Program cost to date	144
Europe
Restructuring Cost and Reserve [Line Items]
Restructuring charge	40	126	74
Program cost to date	339
Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring charge	9	8	4
Program cost to date	33
Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring charge	11	7	13
Program cost to date	92
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charge	(142)	$ 39	$ 56
Program cost to date	$ 18