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Commitments and Contingencies (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases      
Lease expense $ 145us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 132us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 102us-gaap_OperatingLeasesRentExpenseMinimumRentals
2015 162us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 151us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 127us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 102us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 78us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 373us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total 993us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Other commitments      
2015 62us-gaap_OtherCommitmentDueInNextTwelveMonths    
2016 62us-gaap_OtherCommitmentDueInSecondYear    
2017 49us-gaap_OtherCommitmentDueInThirdYear    
2018 38us-gaap_OtherCommitmentDueInFourthYear    
2019 27us-gaap_OtherCommitmentDueInFifthYear    
Thereafter 90us-gaap_OtherCommitmentDueAfterFifthYear    
Total 328us-gaap_OtherCommitment    
Total      
2015 224us-gaap_ContractualObligationDueInNextTwelveMonths    
2016 213us-gaap_ContractualObligationDueInSecondYear    
2017 176us-gaap_ContractualObligationDueInThirdYear    
2018 140us-gaap_ContractualObligationDueInFourthYear    
2019 105us-gaap_ContractualObligationDueInFifthYear    
Thereafter 463us-gaap_ContractualObligationDueAfterFifthYear    
Total $ 1,321us-gaap_ContractualObligation