Credit Losses on Financial Instruments (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2023:

	Business		Mass Markets	Total
	(Dollars in millions)
As of December 31, 2022	$	20	16	36
Provision for expected losses	9		19	28
Write-offs charged against the allowance	(8)		(21)	(29)
Ending balance at June 30, 2023	$	21	14	35