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Segment Information - Total Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Assets      
Total assets: $ 9,548 $ 9,699 $ 9,940
Reportable Segment Totals      
Assets      
Total assets: 9,315 9,451 9,674
Americas      
Assets      
Total assets: 5,241 5,497 5,455
Europe      
Assets      
Total assets: 3,053 3,036 3,220
Asia Pacific      
Assets      
Total assets: 1,021 918 999
Other      
Assets      
Total assets: $ 233 $ 248 $ 266