Credit Losses on Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2024

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 six months ended June 30, 2024:

	Business		Mass Markets	Total
	(Dollars in millions)
As of December 31, 2023	$	14	20	34
Provision for expected losses	7		22	29
Write-offs charged against the allowance	(6)		(23)	(29)
Recoveries collected	—		1	1
Ending balance at June 30, 2024	$	15	20	35