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 for our accounts receivable portfolio:

	Business		Consumer	Total
	(Dollars in millions)
Beginning balance at January 1, 2020 (1)	$	17	18	35
Provision for expected losses	30		36	66
Write-offs charged against the allowance	(22)		(26)	(48)
Recoveries collected	4		4	8
Ending balance at December 31, 2020	$	29	32	61

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