Restructuring, Impairment and Integration Charges (Summary of Charges) (Details) - USD ($) $ in Millions	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 07, 2019	Jun. 15, 2019	Mar. 23, 2019	Sep. 08, 2018	Jun. 16, 2018	Mar. 24, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Total Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges	$ 98	$ 158	$ 26	$ 35	$ 32	$ 12	$ 88	$ 229	$ 373	$ 316	$ 311
2019 Productivity Plan
Total Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges									370	138	0
2014 Productivity Plan
Total Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges									0	170	295
Total restructuring and impairment charges
Total Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges									370	308	295
Other productivity initiatives
Total Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges									$ 3	$ 8	$ 16