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Lease Commitments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Lease Commitments [Abstract]  
2015 $ 69us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 59us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 52us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 41us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 29us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
After 2019 $ 42us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter