Reportable Segments (Details) $ in Millions		3 Months Ended
		Apr. 01, 2017 USD ($)	Apr. 02, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments		9
Number of remaining reportable segments based on geographical locations		3
Net sales		$ 3,254	$ 3,395
Operating profit (loss)		360	438
Mark-to-market adjustments for pension plans, commodity and foreign currency contracts		(21)	(24)
Operating Segments
Segment Reporting Information [Line Items]
Operating profit (loss)		382	472
Operating Segments | U.S. Morning Foods
Segment Reporting Information [Line Items]
Net sales		719	767
Operating profit (loss)		160	148
Operating Segments | U.S. Snacks
Segment Reporting Information [Line Items]
Net sales		781	832
Operating profit (loss)		(44)	83
Operating Segments | U.S. Specialty
Segment Reporting Information [Line Items]
Net sales		395	376
Operating profit (loss)		96	86
Operating Segments | North America Other
Segment Reporting Information [Line Items]
Net sales		393	414
Operating profit (loss)		49	45
Operating Segments | Europe
Segment Reporting Information [Line Items]
Net sales		512	598
Operating profit (loss)		66	70
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Net sales		222	192
Operating profit (loss)		33	23
Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Net sales		232	216
Operating profit (loss)		22	17
Corporate
Segment Reporting Information [Line Items]
Operating profit (loss)	[1]	$ (22)	$ (34)

[1] Includes mark-to-market adjustments for pension and postretirement plans, commodity and foreign currency contracts totaling ($21) million and ($24) million for the quarters ended April 1, 2017 and April 2, 2016, respectively.