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Segment Information - Total Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Assets      
Total assets: $ 8,874 $ 8,882 $ 9,579
Reportable Segment Totals      
Assets      
Total assets: 8,474 8,434 8,661
Americas      
Assets      
Total assets: 4,972 4,927 4,707
Europe      
Assets      
Total assets: 3,502 3,507 3,315
Asia Pacific      
Assets      
Total assets:     639
Other      
Assets      
Total assets: $ 400 $ 448 $ 918