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Segment Reporting - Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Total long-lived assets $ 10,651 $ 10,628 $ 10,176
United States      
Segment Reporting Information [Line Items]      
Total long-lived assets 1,851 1,956 1,806
United Kingdom      
Segment Reporting Information [Line Items]      
Total long-lived assets 1,125 888 843
Other      
Segment Reporting Information [Line Items]      
Total long-lived assets $ 7,675 $ 7,784 $ 7,527