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Employee Stock Compensation Plans - Stock Options (Details) (Stock Options [Member], USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, Beginning balance, Shares Under Option (in shares) 1,938us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Granted, Shares Under Option (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod    
Vested, Shares Under Option (in shares) (455)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised    
Forfeited or expired, Shares Under Option (in shares) (3)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod    
Outstanding, Ending balance, Shares Under Option (in shares) 1,480us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 1,938us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Outstanding, Beginning balance, Weighted Average Exercise Price per Share (in dollars per share) $ 17.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice    
Granted, Weighted Average Exercise Price per Share (in dollars per share) $ 0.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice    
Vested, Weighted Average Exercise Price per Share (in dollars per share) $ 15.57us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice    
Forfeited or expired, Weighted Average Exercise Price per Share (in dollars per share) $ 16.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice    
Outstanding, Ending balance, Weighted Average Exercise Price per Share (in dollars per share) $ 17.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 17.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Outstanding, Weighted Average Remaining Contratual Term (in years) 3 years 3 months 18 days    
Outstanding, Aggregate Intrinsic Value $ 17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue    
Exercisable, Shares Under Option (in shares) 1,473us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber    
Exercisable, Weighted Average Exercise Price per Share (in dollars per share) $ 17.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice    
Exercisable, Weighted Average Remaining Contractual Term (in years) 3 years 3 months 11 days    
Exercisable, Aggregate Intrinsic Value 17us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]      
Fully vested and expected to vest, Shares Under Option (in shares) 1,480us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber    
Fully vested and expected to vest, Weighted Average Exercise Price per Share (in dollars per share) $ 17.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice    
Fully vested and expected to vest, Weighted Average Remaining Contractual Term (in years) 3 years 3 months 18 days    
Fully vested and expected to vest, Aggregate Intrinsic Value 17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue    
Total intrinsic value of all options exercised 8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Cash received from option exercises 7us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 51us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 47us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
Tax benefit realized from these exercises $ 2us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions $ 12us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions $ 10us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]      
Vesting period 1 year    
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]      
Vesting period 10 years