Restructuring and Impairment Charges 2014 Productivity Plan Activity Rollforward (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 16, 2018		Jun. 17, 2017		Jun. 16, 2018		Jun. 17, 2017		Dec. 30, 2017
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring					$ (126)		$ (25)
2014 Productivity Plan [Member] [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 125				125				$ 226
Restructuring, Settlement and Impairment Provisions	32		$ 34		44		61
Payments for Restructuring					(126)
Restructuring Reserve, Settled without Cash					(19)
Employee Severance [Member] | 2014 Productivity Plan [Member] [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	118				118				212
Restructuring, Settlement and Impairment Provisions	21	[1]	31	[1]	24	[2]	49	[2]
Payments for Restructuring					(106)
Restructuring Reserve, Settled without Cash					(12)
Asset Impairment [Member] | 2014 Productivity Plan [Member] [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0				0				0
Restructuring, Settlement and Impairment Provisions	4		2		8		13
Payments for Restructuring					0
Restructuring Reserve, Settled without Cash					(8)
Other Restructuring [Member] | 2014 Productivity Plan [Member] [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	7				7				$ 14
Restructuring, Settlement and Impairment Provisions	$ 7		$ 1		12		$ (1)
Payments for Restructuring					(20)
Restructuring Reserve, Settled without Cash					$ 1

[1] There were no charges related to other pension and retiree medical benefits for the 12 weeks ended June 16, 2018. The 12 weeks ended June 17, 2017 includes charges related to other pension and retiree medical benefits of $1 million.

[2] Includes charges related to other pension and retiree medical benefits of $4 million and $2 million for the 24 weeks ended June 16, 2018 and June 17, 2017, respectively.