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Equity (Unrecognized Compensation Expense Related to Stock-Based Compensation) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expense $ 12us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted Average Period 1 year 6 months 13 days
Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expense 47us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Weighted Average Period 1 year 7 months
Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expense $ 56us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Weighted Average Period 1 year 8 months 13 days