Supplemental Information (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Supplemental Information [Abstract]
Gross receivables aged less than one year	$ 4,326		$ 4,169
Gross receivables aged greater than one year	316		358
Other receivables	130		111
Accounts receivable - net	4,342		4,167
Allowance for credit loss	430		471
Provisions for expected credit losses	71	$ 95
Inventories
Raw materials and supplies	369		411
Work in process	358		337
Finished goods	965		981
Total inventories	$ 1,692		$ 1,729

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