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Leases (details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases disclosure      
Rent expense $ 188 $ 197 $ 202
Future minimum annual rental payments due for 2018 130    
Future minimum annual rental payments due for 2019 108    
Future minimum annual rental payments due for 2020 91    
Future minimum annual rental payments due for 2021 75    
Future minimum annual rental payments due for 2022 51    
Future minimum annual rental payments due for 2023 and thereafter 103    
Approximate aggregate future sublease rental income that will partially offset the lease commitments $ 4