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Segment Information - Total Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Assets      
Total assets: $ 9,940 $ 9,756 $ 9,999
Reportable Segment Totals      
Assets      
Total assets: 9,674 9,545 9,784
Americas      
Assets      
Total assets: 5,455 5,411 5,598
Europe      
Assets      
Total assets: 3,220 3,133 3,140
Asia Pacific      
Assets      
Total assets: 999 1,001 1,046
Other      
Assets      
Total assets: $ 266 $ 211 $ 215