Credit Losses on Financial Instruments (Tables)

9 Months Ended

Sep. 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 nine months ended September 30, 2024:

	Business		Mass Markets	Total
	(Dollars in millions)
As of December 31, 2023	$	14	20	34
Provision for expected losses	8		27	35
Write-offs charged against the allowance	(8)		(32)	(40)
Recoveries collected	—		2	2
Ending balance at September 30, 2024	$	14	17	31