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Segment Reporting - Long-lived Assets by Geographical Segments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
United States    
Segment Reporting Information [Line Items]    
Total long-lived assets $ 4,110 $ 4,823
Italy    
Segment Reporting Information [Line Items]    
Total long-lived assets 1,444 1,398
France    
Segment Reporting Information [Line Items]    
Total long-lived assets 738 723
Germany    
Segment Reporting Information [Line Items]    
Total long-lived assets 601 573
Spain    
Segment Reporting Information [Line Items]    
Total long-lived assets 717 643
Canada    
Segment Reporting Information [Line Items]    
Total long-lived assets 149 557
Brazil    
Segment Reporting Information [Line Items]    
Total long-lived assets 217 294
China    
Segment Reporting Information [Line Items]    
Total long-lived assets 571 219
Other    
Segment Reporting Information [Line Items]    
Total long-lived assets 899 1,062
Total Revenues from external customers in the rest of world    
Segment Reporting Information [Line Items]    
Total long-lived assets $ 9,446 $ 10,292