Shareholders' Equity (Details) - USD ($) shares in Thousands, $ in Millions	6 Months Ended
	Jun. 11, 2016		Jun. 13, 2015
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased	22,294	[1]	3,680	[2]
Dollar Value of Shares Repurchased	$ 1,664	[1]	$ 295	[2]
Remaining Dollar Value of Shares that may be Repurchased	3,697
Value of share repurchases with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date.	$ 105		$ 8
Number of shares repurchased with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date.	1,300		100
November 2013 [Member]
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased	0		1,779
Dollar Value of Shares Repurchased	$ 0		$ 133
Remaining Dollar Value of Shares that may be Repurchased	$ 0
November 2014 [Member]
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased	0		1,901
Dollar Value of Shares Repurchased	$ 0		$ 162
Remaining Dollar Value of Shares that may be Repurchased	$ 0
December 2015 [Member]
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased	13,369		0
Dollar Value of Shares Repurchased	$ 933		$ 0
Remaining Dollar Value of Shares that may be Repurchased	$ 0
March 2016 [Member]
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased	2,823		0
Dollar Value of Shares Repurchased	$ 228		$ 0
Remaining Dollar Value of Shares that may be Repurchased	$ 0
May 2016 [Member]
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased	6,102		0
Dollar Value of Shares Repurchased	$ 503		$ 0
Remaining Dollar Value of Shares that may be Repurchased	3,697
Stock Repurchase Program, Authorized Amount	$ 4,200

[1] Includes the effect of $105 million in share repurchases (1.3 million shares) with trade dates prior to June 11, 2016 but cash settlement dates subsequent to June 11, 2016.

[2] Includes the effect of $8 million in share repurchases (0.1 million shares) with trade dates prior to June 13, 2015 but cash settlement dates subsequent to June 13, 2015.