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Leases - Net Rental Expense (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Abstract]      
Noncancelable, Minimum rental expense $ 68us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 72us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 115us-gaap_OperatingLeasesRentExpenseMinimumRentals
Noncancelable, Contingent rental expense 2us-gaap_OperatingLeasesRentExpenseContingentRentals 2us-gaap_OperatingLeasesRentExpenseContingentRentals 2us-gaap_OperatingLeasesRentExpenseContingentRentals
Noncancelable, Sublease rental expense (1)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 (1)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 (1)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
Operating Leases, Rent Expense 68us-gaap_LeaseAndRentalExpense 58us-gaap_LeaseAndRentalExpense 78us-gaap_LeaseAndRentalExpense
Total net rent expense $ 137us-gaap_OperatingLeasesRentExpenseNet $ 131us-gaap_OperatingLeasesRentExpenseNet $ 194us-gaap_OperatingLeasesRentExpenseNet