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Segment Information - Total Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Assets      
Total assets: $ 9,818 $ 9,756 $ 9,780
Reportable Segment Totals      
Assets      
Total assets: 9,615 9,545 9,572
Americas      
Assets      
Total assets: 5,402 5,411 5,511
Europe      
Assets      
Total assets: 3,232 3,133 3,074
Asia Pacific      
Assets      
Total assets: 981 1,001 987
Other      
Assets      
Total assets: $ 203 $ 211 $ 208