Restructuring and Cost Reduction Activities - Schedule of Restructuring and Cost Reduction Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1	$ 40	$ 239	$ 164
Program costs to date	1,393		1,393
Employee related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	31	6	166	26
Program costs to date	523		523
Pension curtailment (gain) loss, net
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(134)	0	(133)	0
Program costs to date	(122)		(122)
Asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	0	16
Program costs to date	155		155
Asset related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	38	5	68	32
Program costs to date	260		260
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	66	29	138	90
Program costs to date	577		577
Operating Segments | U.S. Morning Foods
Restructuring Cost and Reserve [Line Items]
Restructuring charges	14	4	16	13
Program costs to date	257		257
Operating Segments | U.S. Snacks
Restructuring Cost and Reserve [Line Items]
Restructuring charges	106	8	305	62
Program costs to date	507		507
Operating Segments | U.S. Specialty
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	1	1	4
Program costs to date	20		20
Operating Segments | North America Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4	7	13	20
Program costs to date	141		141
Operating Segments | Europe
Restructuring Cost and Reserve [Line Items]
Restructuring charges	13	6	21	34
Program costs to date	320		320
Operating Segments | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2	2	6	6
Program costs to date	30		30
Operating Segments | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1	2	5	6
Program costs to date	86		86
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(139)	$ 10	(128)	$ 19
Program costs to date	$ 32		$ 32