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Segment and Geographic Information - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Total long lived assets $ 39,696.3 $ 38,291.5
U.S.    
Segment Reporting Information [Line Items]    
Total long lived assets $ 19,509.7 $ 19,487.6