Nature of Operations and Significant Accounting Policies (Other Items - Share Repurchases) (Details) - USD ($) shares in Millions	12 Months Ended
Dec. 25, 2015	Dec. 26, 2014	Dec. 27, 2013	Apr. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Share repurchase program				$ 2,000,000,000
Shares acquired, repurchase amount	$ 804,000,000	$ 517,000,000	$ 353,000,000
Stock repurchased, shares	26	17	14

Number of shares that have been repurchased and retired during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Name:	us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration