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Segment Reporting - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]      
Number of segments (in segments) | segment 5    
Revenues $ 26,032 $ 28,079 $ 29,706
U.K      
Segment Reporting Information [Line Items]      
Revenues 777 888 1,006
Total long-lived assets 151 178  
Total Revenues from external customers in the rest of world      
Segment Reporting Information [Line Items]      
Revenues 25,255 27,191 $ 28,700
Total long-lived assets $ 9,446 $ 10,292