Stock Compensation - Additional Information (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from exercise of stock options		$ 3
Cash paid to settle SARs and RSUs		1
Stock compensation expense		4	5
Total unrecognized compensation cost related to nonvested awards granted and expected to vest	$ 34	$ 34
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized	2 years 3 months 18 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period		0.2
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 expected term 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		0.3
Stock options and SARs forfeited in period		0.1