Restructuring and Cost Reduction Activities - Schedule of Restructuring and Cost Reduction Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 20	$ 142
Program costs to date	1,397
Employee related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4	107
Program costs to date	538
Pension curtailment (gain) loss, net
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	4
Program costs to date	(137)
Asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0
Program costs to date	155
Asset related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4	10
Program costs to date	273
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	12	21
Program costs to date	568
Operating Segments | U.S. Snacks
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6	120
Program costs to date	509
Operating Segments | U.S. Morning Foods
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2	1
Program costs to date	253
Operating Segments | U.S. Specialty
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0
Program costs to date	21
Operating Segments | North America Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2	7
Program costs to date	142
Operating Segments | Europe
Restructuring Cost and Reserve [Line Items]
Restructuring charges	7	6
Program costs to date	337
Operating Segments | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2	1
Program costs to date	29
Operating Segments | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	1
Program costs to date	87
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1	$ 6
Program costs to date	$ 19