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Revenue - Disaggregation of Net Revenues by Major Source (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from:      
Net sales $ 24,285 $ 26,149 $ 27,831
Finance and interest income 988 1,164 1,115
Rents and other income on operating lease 759 766 760
Finance and interest income 1,747 1,930 1,875
Total Revenues 26,032 28,079 29,706
Sales of goods      
Revenues from:      
Net sales 23,333 25,103 26,838
Rendering of services      
Revenues from:      
Net sales 637 660 527
Rents on assets sold with a buy-back commitment      
Revenues from:      
Net sales $ 315 $ 386 $ 466