Credit Losses on Financial Instruments (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss
Beginning balance	$ 36
Provision for expected losses	28
Write-offs charged against the allowance	(29)
Ending balance	35
Business
Financing Receivable, Allowance for Credit Loss
Beginning balance	20
Provision for expected losses	9
Write-offs charged against the allowance	(8)
Ending balance	21
Mass Markets
Financing Receivable, Allowance for Credit Loss
Beginning balance	16
Provision for expected losses	19
Write-offs charged against the allowance	(21)
Ending balance	$ 14