Credit Losses on Financial Instruments (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss
Beginning balance	$ 36
Provision for expected losses	51
Write-offs charged against the allowance	(45)
Ending balance	43
Recoveries collected	1
Business
Financing Receivable, Allowance for Credit Loss
Beginning balance	20
Provision for expected losses	16
Write-offs charged against the allowance	(12)
Ending balance	24
Recoveries collected	0
Mass Markets
Financing Receivable, Allowance for Credit Loss
Beginning balance	16
Provision for expected losses	35
Write-offs charged against the allowance	(33)
Ending balance	19
Recoveries collected	$ 1