Credit Losses (Tables)

9 Months Ended

Sep. 30, 2020

Credit Loss [Abstract]

Accounts Receivable, Allowance for Credit Loss

The following table summarizes the activity for the allowance for credit losses for the nine months ended September 30, 2020:

($ in millions)	Trade Receivables Allowance for Credit Losses
January 1, 2020	$22
Current-period provision for credit losses	41
Trade receivables written off as uncollectible, net of recoveries	(15)
Foreign currency impact	(1)
September 30, 2020	$47