Credit Losses on Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2022

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, 2022:

	Business		Mass Markets	Total
	(Dollars in millions)
As of December 31, 2021	$	19	19	38
Provision for expected losses	7		9	16
Write-offs charged against the allowance	(8)		(16)	(24)
Recoveries collected	1		—	1
Ending balance at June 30, 2022	$	19	12	31