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Leases (details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases disclosure      
Rent expense $ 197 $ 202 $ 215
Future minimum annual rental payments due for 2017 147    
Future minimum annual rental payments due for 2018 118    
Future minimum annual rental payments due for 2019 100    
Future minimum annual rental payments due for 2020 80    
Future minimum annual rental payments due for 2021 60    
Future minimum annual rental payments due for 2022 and thereafter 100    
Approximate aggregate future sublease rental income that will partially offset the lease commitments $ 4