Restructuring and Impairment Charges 2014 Productivity Plan Activity Rollforward (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 24, 2018	Mar. 25, 2017	Dec. 30, 2017
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring		$ (39)	$ (7)
2014 Productivity Plan [Member] [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		189		$ 226
Restructuring, Settlement and Impairment Provisions		12	27
Payments for Restructuring		(39)
Restructuring Reserve, Settled without Cash		(10)
Employee Severance [Member] | 2014 Productivity Plan [Member] [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		181		212
Restructuring, Settlement and Impairment Provisions	[1]	3	18
Payments for Restructuring		(28)
Restructuring Reserve, Settled without Cash		(6)
Asset Impairment [Member] | 2014 Productivity Plan [Member] [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		0		0
Restructuring, Settlement and Impairment Provisions		4	11
Payments for Restructuring		0
Restructuring Reserve, Settled without Cash		(4)
Other Restructuring [Member] | 2014 Productivity Plan [Member] [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		8		$ 14
Restructuring, Settlement and Impairment Provisions		5	$ (2)
Payments for Restructuring		(11)
Restructuring Reserve, Settled without Cash		$ 0

[1] Includes charges related to other pension and retiree medical benefits of $4 million and $1 million for the 12 weeks ended March 24, 2018 and March 25, 2017, respectively.