Stock-Based Compensation (Unrecognized Compensation Costs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share Based Compensation Unrecognized and Non-Vested Cost [Line Items]
Unrecognized Compensation Cost	$ 55
Weighted Average to be Recognized	11 months 5 days
Restricted Stock [Member]
Share Based Compensation Unrecognized and Non-Vested Cost [Line Items]
Unrecognized Compensation Cost	10
Weighted Average to be Recognized	11 months 5 days
Performance Shares [Member]
Share Based Compensation Unrecognized and Non-Vested Cost [Line Items]
Unrecognized Compensation Cost	$ 45
Weighted Average to be Recognized	11 months 5 days