Reportable Segments Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 30, 2017	Dec. 31, 2016		Jan. 02, 2016
Segment Reporting Information [Line Items]
Assets	$ 16,350				$ 15,111				$ 16,350	$ 15,111		$ 15,251
Net sales	3,209	$ 3,273	$ 3,187	$ 3,254	3,097	$ 3,254	$ 3,268	$ 3,395	12,923	13,014		13,525
Operating profit									1,946	1,395		1,091
Depreciation and amortization									481	517	[1]	534	[1]
Interest expense									256	406		227
Income taxes									412	233		159
Property, Plant and Equipment, Additions									501	507		553
U.S. Morning Foods
Segment Reporting Information [Line Items]
Net sales									2,778	2,931		2,992
Operating profit									601	593		474
Depreciation and amortization									120	122		123
U.S. Snacks
Segment Reporting Information [Line Items]
Net sales									3,067	3,198		3,234
Operating profit									115	324		385
Depreciation and amortization									146	159	[1]	135
U.S. Specialty
Segment Reporting Information [Line Items]
Net sales									1,249	1,214		1,181
Operating profit									312	279		260
Depreciation and amortization									13	11		11
North America Other
Segment Reporting Information [Line Items]
Net sales									1,616	1,598		1,687
Operating profit									230	181		178
Depreciation and amortization									51	56		74	[1]
Interest expense									3	5		5
North America [Member]
Segment Reporting Information [Line Items]
Assets	10,867				10,533				10,867	10,533		10,363
Property, Plant and Equipment, Additions									329	318		342
Europe
Segment Reporting Information [Line Items]
Assets	4,057				3,824				4,057	3,824		3,742
Net sales									2,291	2,377		2,497
Operating profit									279	205		247
Depreciation and amortization									80	114	[1]	120
Interest expense									16	8		5
Income taxes									(38)	(17)		10
Property, Plant and Equipment, Additions									106	125		110
Latin America
Segment Reporting Information [Line Items]
Assets	1,094				1,136				1,094	1,136		587
Net sales									955	780		1,015
Operating profit									108	84		9
Depreciation and amortization									37	22		28	[1]
Interest expense									2	4		5
Income taxes									33	30		34
Property, Plant and Equipment, Additions									32	24		23
Asia Pacific
Segment Reporting Information [Line Items]
Assets	1,225				1,158				1,225	1,158		1,106
Net sales									967	916		919
Operating profit									86	70		54
Depreciation and amortization									33	30		29
Interest expense									2	2		2
Income taxes									12	14		0
Property, Plant and Equipment, Additions									30	36		76
Total Reportable Segments [Member]
Segment Reporting Information [Line Items]
Operating profit									1,731	1,736		1,607
Depreciation and amortization									480	514	[1]	520	[1]
Corporate
Segment Reporting Information [Line Items]
Assets	1,426				1,248				1,426	1,248		1,184
Operating profit									215	(341)		(516)
Depreciation and amortization									1	3		14
Interest expense									233	387		210
Property, Plant and Equipment, Additions									4	4		2
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Assets	$ (2,319)				$ (2,788)				(2,319)	(2,788)		(1,731)
Corporate And North America [Member]
Segment Reporting Information [Line Items]
Income taxes									$ 405	$ 206		$ 115

[1] Includes asset impairment charges as discussed in Note 14.