Supplemental Information (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Supplemental Information [Abstract]
Gross receivables aged less than one year	$ 4,358		$ 4,169
Gross receivables aged greater than one year	308		358
Other receivables	124		111
Accounts receivable - net	4,367		4,167
Allowance for credit loss	423		471
Provisions for expected credit losses	101	$ 136
Inventories
Raw materials and supplies	391		411
Work in process	357		337
Finished goods	946		981
Total inventories	$ 1,694		$ 1,729

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