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Supplemental Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Supplemental Information [Abstract]      
Gross receivables aged less than one year $ 4,044   $ 4,390
Gross receivables aged greater than one year 337   249
Receivables, net of reserves 4,033   4,322
Allowances for expected credit losses 452   306
Provisions for expected credit losses 136 $ 146  
Inventories      
Raw materials and supplies 400   396
Work in process 374   331
Finished goods 959   970
Total inventories $ 1,733   $ 1,697