Supplemental Information (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Supplemental Information [Abstract]
Gross receivables aged less than one year	$ 4,177		$ 4,390
Gross receivables aged greater than one year	261		249
Receivables, net of reserves	4,084		4,322
Allowances for expected credit losses	363		306
Provisions for expected credit losses	46	$ 56
Inventories
Raw materials and supplies	374		396
Work in process	338		331
Finished goods	977		970
Total inventories	$ 1,689		$ 1,697

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