Credit Losses on Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2021

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 for the three months ended March 31, 2021:

	Business		Mass Markets	Total
	(Dollars in millions)
Beginning balance at January 1, 2021 (1)	$	25	36	61
Provision for expected losses	4		3	7
Write-offs charged against the allowance	(7)		(10)	(17)
Recoveries collected	1		1	2
Ending balance at March 31, 2021	$	23	30	53

(1)    Due to an internal reorganization of our reporting categories on January 1, 2021, our accounts receivable portfolios were changed to align with changes to how we manage our customers. Allowance for credit losses previously included in the Consumer and Business portfolio of $32 million and $4 million, respectively, were reclassified to the Mass Markets allowance for credit losses on January 1, 2021, as a result of this change.