Stock Transactions And Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended			0 Months Ended	3 Months Ended	9 Months Ended	0 Months Ended	3 Months Ended	9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Jul. 16, 2013	Sep. 26, 2014 RSUs:	Sep. 26, 2014 RSUs:	Sep. 26, 2014 RSUs:	Sep. 26, 2014 Stock Options	Sep. 26, 2014 Stock Options	Sep. 26, 2014 Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized shares to be repurchased			20,000,000
Stock repurchase program, remaining number of shares authorized to be repurchased	20,000,000
Common shares reserved for issuance under the 2007 Stock Incentive Plan (shares)	25,000,000
Total unrecognized compensation cost					$ 174	$ 174		$ 143	$ 143
Weighted average period for cost to be recognized (in years)				3 years			3 years
Aggregate intrinsic value of options exercised	95	136
Cash receipts due to exercise of options	79	134
Tax benefit realized related to exercise of stock options					13	34		8	29
Total number of shares withheld sufficient to fund minimum tax withholding requirements related to the vesting of restricted stock units (shares)	541,000
Total value of shares withheld sufficient to fund minimum tax withholding requirements related to the vesting of restricted stock units	$ 41