Restructuring, Impairment and Integration Charges 2014 Productivity Plan Activity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 19, 2016	Mar. 21, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions	$ 30	$ 36
Cash payments for restructuring charges	(30)	(47)
Other Restructuring Costs	1	0
Total restructuring and impairment charges and other productivity initiatives	31	36
2014 Productivity Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - Period Start	81
Restructuring, Settlement and Impairment Provisions	30	30
Cash payments for restructuring charges	22
Restructuring Reserve, Settled without Cash	9
Restructuring Reserve - Period End	80
Restructuring Charges After Tax	$ 25	$ 24
Restructuring, Settlement and Impairment Provisions, Net of Tax, Per Share Amount	$ 0.02	$ 0.02
Productivity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions	$ 0	$ 6
Cash payments for restructuring charges	(8)
Restructuring Reserve - Period End	28
Restructuring Charges After Tax		$ 5
Employee Severance [Member] | 2014 Productivity Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - Period Start	61
Restructuring, Settlement and Impairment Provisions	8
Cash payments for restructuring charges	9
Restructuring Reserve, Settled without Cash	(2)
Restructuring Reserve - Period End	62
Asset Impairment [Member] | 2014 Productivity Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - Period Start	0
Restructuring, Settlement and Impairment Provisions	11
Cash payments for restructuring charges	0
Restructuring Reserve, Settled without Cash	11
Restructuring Reserve - Period End	0
Other Costs [Member] | 2014 Productivity Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - Period Start	20
Restructuring, Settlement and Impairment Provisions	11
Cash payments for restructuring charges	13
Restructuring Reserve, Settled without Cash	0
Restructuring Reserve - Period End	$ 18