Stock Transactions And Stock-Based Compensation (Narrative) (Details) shares in Thousands, $ in Millions		3 Months Ended	9 Months Ended
	Sep. 30, 2016 USD ($) shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2016 USD ($) shares	Oct. 02, 2015 USD ($)	Jul. 02, 2016	Dec. 31, 2015	Jul. 16, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized shares to be repurchased | shares							20,000
Stock repurchase program, remaining number of shares authorized to be repurchased | shares	20,000	20,000	20,000
Common shares reserved for issuance under the 2007 Stock Incentive Plan, shares | shares	28,000	28,000	28,000
Total number of shares withheld sufficient to fund minimum tax withholding requirements related to exercising of stock options and vesting of RSUs, shares | shares			600
Total value of shares withheld sufficient to fund minimum tax withholding requirements related to exercising of stock options and vesting of RSUs			$ 44
Separation conversion factor					1.32	1.32
Restricted stock units (“RSUs”)/performance stock units (“PSUs”)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 133	$ 133	133
Weighted average period for cost to be recognized	2 years
Tax benefit realized related to exercise of options		10	34
Separation conversion factor						1.32
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 112	112	112
Weighted average period for cost to be recognized	3 years
Aggregate intrinsic value of options exercised			181	$ 245
Cash receipts due to exercise of options			146	$ 169
Tax benefit realized related to exercise of options		$ 7	$ 57