Credit Losses on Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2020

Credit Loss [Abstract]

Financing receivable, allowance for credit loss

The following table presents the activity of our allowance for credit losses by accounts receivable portfolio:

	Business		Consumer	Total
	(Dollars in millions)
Beginning balance at January 1, 2020 (1)	$	58	37	95
Provision for expected losses	115		74	189
Write-offs charged against the allowance	(74)		(59)	(133)
Recoveries collected	24		18	42
Foreign currency exchange rate changes adjustment	(2)		—	(2)
Ending balance at December 31, 2020	$	121	70	191

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(1)The beginning balance includes the cumulative effect of the adoption of the new credit loss standard.