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Stock-Based Compensation (Unrecognized Compensation Costs) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Share Based Compensation Unrecognized and Non-Vested Cost [Line Items]  
Unrecognized Compensation Cost $ 58us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Weighted Average to be Recognized 11 months 25 days
Restricted Stock [Member]  
Share Based Compensation Unrecognized and Non-Vested Cost [Line Items]  
Unrecognized Compensation Cost 10us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Weighted Average to be Recognized 1 year 23 days
Performance Shares [Member]  
Share Based Compensation Unrecognized and Non-Vested Cost [Line Items]  
Unrecognized Compensation Cost $ 48us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Weighted Average to be Recognized 11 months 22 days