Credit Losses on Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2023

Credit Loss [Abstract]

Schedule of Allowance for Credit Loss

The following table presents the activity of our allowance for credit losses by accounts receivable portfolio for the nine months ended September 30, 2023:

	Business		Mass Markets	Total
	(Dollars in millions)
As of December 31, 2022	$	20	16	36
Provision for expected losses	16		35	51
Write-offs charged against the allowance	(12)		(33)	(45)
Recoveries collected	—		1	1
Ending balance at September 30, 2023	$	24	19	43