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Segment Reporting - Revenue by Geographical Segments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Revenues $ 26,032 $ 28,079 $ 29,706
United States      
Segment Reporting Information [Line Items]      
Revenues 5,191 5,610 5,719
Italy      
Segment Reporting Information [Line Items]      
Revenues 2,673 3,253 3,383
France      
Segment Reporting Information [Line Items]      
Revenues 2,840 3,030 2,994
Brazil      
Segment Reporting Information [Line Items]      
Revenues 1,937 2,105 2,093
Germany      
Segment Reporting Information [Line Items]      
Revenues 1,765 1,875 2,062
Canada      
Segment Reporting Information [Line Items]      
Revenues 941 1,087 1,124
Australia      
Segment Reporting Information [Line Items]      
Revenues 824 739 929
Spain      
Segment Reporting Information [Line Items]      
Revenues 751 987 1,084
Argentina      
Segment Reporting Information [Line Items]      
Revenues 522 509 524
Poland      
Segment Reporting Information [Line Items]      
Revenues 576 604 658
Other      
Segment Reporting Information [Line Items]      
Revenues 7,235 7,392 8,130
Total Revenues from external customers in the rest of world      
Segment Reporting Information [Line Items]      
Revenues $ 25,255 $ 27,191 $ 28,700