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Goodwill and Other Intangible Assets (Goodwill) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill, Period Increase (Decrease) $ (964)us-gaap_GoodwillPeriodIncreaseDecrease $ (592)us-gaap_GoodwillPeriodIncreaseDecrease
Maximum [Member]    
Goodwill [Line Items]    
Reporting Unit Percentage Of Fair Value In Excess Of Carrying Amount 13.30%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Minimum [Member]    
Goodwill [Line Items]    
Reporting Unit Percentage Of Fair Value In Excess Of Carrying Amount 10.50%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_RangeAxis
= us-gaap_MinimumMember