Stock Transactions And Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended			3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013	Jul. 16, 2013	Jun. 27, 2014 RSUs:	Jun. 27, 2014 RSUs:	Jun. 27, 2014 Stock Options	Jun. 27, 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)	27,000,000
Total unrecognized compensation cost				$ 147	$ 147	$ 129	$ 129
Weighted average period for cost to be recognized (in years)					3 years		3 years
Aggregate intrinsic value of options exercised	71	96
Cash receipts due to exercise of options	56	96
Tax benefit realized related to exercise of stock options				1	21	11	21
Total number of shares withheld sufficient to fund minimum tax withholding requirements related to the vesting of restricted stock units (shares)	316,000
Total value of shares withheld sufficient to fund minimum tax withholding requirements related to the vesting of restricted stock units	$ 24