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Leases (details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases disclosure      
Rent expense $ 215us-gaap_LeaseAndRentalExpense $ 196us-gaap_LeaseAndRentalExpense $ 192us-gaap_LeaseAndRentalExpense
Future minimum annual rental payments due for 2015 160us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
Future minimum annual rental payments due for 2016 144us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
Future minimum annual rental payments due for 2017 118us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
Future minimum annual rental payments due for 2018 80us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
Future minimum annual rental payments due for 2019 61us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Future minimum annual rental payments due for 2020 and thereafter 133us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Approximate aggregate future sublease rental income that will partially offset the lease commitments $ 6us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals