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Lease Commitments (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Leases [Abstract]      
Operating leases, rent expense, net $ 243 $ 216 $ 233
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2016 202    
2017 196    
2018 170    
2019 143    
2020 119    
After 2020 $ 1,002