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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Rent expense $ 185 $ 188 $ 197
Future minimum annual rental payments due for 2019 127    
Future minimum annual rental payments due for 2020 105    
Future minimum annual rental payments due for 2021 89    
Future minimum annual rental payments due for 2022 61    
Future minimum annual rental payments due for 2023 41    
Future minimum annual rental payments due for 2024 and thereafter 77    
Approximate aggregate future sublease rental income that will partially offset the lease commitments $ 1