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Segment Information - Total Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Assets      
Total assets: $ 10,152 $ 9,699 $ 10,281
Reportable Segment Totals      
Assets      
Total assets: 9,906 9,451 10,080
Americas      
Assets      
Total assets: 5,621 5,497 5,637
Europe      
Assets      
Total assets: 3,273 3,036 3,387
Asia Pacific      
Assets      
Total assets: 1,012 918 1,056
Other      
Assets      
Total assets: $ 246 $ 248 $ 201