Reportable Segments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)	Apr. 01, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments	10
Number of remaining reportable segments based on geographical locations	3
Net sales	$ 3,401	$ 3,248
Operating profit	510	280
Operating Segments
Segment Reporting Information [Line Items]
Operating profit	522	387
Operating Segments | U.S. Snacks
Segment Reporting Information [Line Items]
Net sales	762	795
Operating profit	102	(36)
Operating Segments | U.S. Morning Foods
Segment Reporting Information [Line Items]
Net sales	691	708
Operating profit	150	157
Operating Segments | U.S. Specialty
Segment Reporting Information [Line Items]
Net sales	398	393
Operating profit	80	96
Operating Segments | North America Other
Segment Reporting Information [Line Items]
Net sales	479	392
Operating profit	67	49
Operating Segments | Europe
Segment Reporting Information [Line Items]
Net sales	587	513
Operating profit	74	66
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Net sales	232	220
Operating profit	22	33
Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Net sales	252	227
Operating profit	27	22
Corporate
Segment Reporting Information [Line Items]
Operating profit	$ (12)	$ (107)