Stock Compensation - Additional Information (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from exercise of stock options				$ 6
Cash paid to settle SARs and RSUs				2
Stock compensation expense		2	5	11	14
Total unrecognized compensation cost related to nonvested awards granted and expected to vest	$ 24	$ 24		$ 24
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized	1 year 10 months 24 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period				0.3
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term				3 years
Risk-free interest rate				0.64%
Dividend yield				1.02%
Expected volatility rate				43.60%
Historical volatility period				3 years
Stock Option And Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options and SARs exercised in period				0.6
Stock options and SARs forfeited in period				0.1