Stock-Based Compensation Plans (Schedule of Weighted-Average Assumptions) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	2.10%	2.30%	2.60%
Expected volatility	35.80%	38.50%	44.70%
Risk-free interest rate	1.50%	1.70%	1.30%
Expected term of options (in years)	4 years 3 months 18 days	4 years 2 months	4 years
Weighted-average grant-date fair value	$ 4	$ 4	$ 4
Non-Employee Director Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	2.10%	2.20%	2.70%
Expected volatility	36.30%	39.60%	45.90%
Risk-free interest rate	2.20%	2.50%	1.90%
Expected term of options (in years)	6 years	6 years 5 months	7 years
Weighted-average grant-date fair value	$ 5	$ 5	$ 5