Stock-Based Compensation Plans (Schedule Of Weighted-Average Assumptions) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	2.70%	2.70%	2.70%
Expected volatility	45.50%	41.60%	41.00%
Risk-free interest rate	0.80%	1.40%	2.00%
Expected term of options (in years)	4 years 1 month 6 days	4 years 2 months 12 days	4 years 3 months 18 days
Weighted-average grant-date fair value	$ 6	$ 8	$ 6
Non-Employee Director Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	2.60%	2.70%	2.70%
Expected volatility	44.50%	40.50%	40.80%
Risk-free interest rate	1.70%	3.20%	3.50%
Expected term of options (in years)	6 years 9 months 18 days	6 years 6 months	8 years 1 month 6 days
Weighted-average grant-date fair value	$ 8	$ 11	$ 8