Credit Losses on Financial Instruments (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss
Beginning balance	$ 38
Provision for expected losses	42
Write-offs charged against the allowance	(47)
Recoveries collected	2
Ending balance	35
Mass Market Portfolio
Financing Receivable, Allowance for Credit Loss
Beginning balance	19
Provision for expected losses	31
Write-offs charged against the allowance	(35)
Recoveries collected	0
Ending balance	15
Business Portfolio
Financing Receivable, Allowance for Credit Loss
Beginning balance	19
Provision for expected losses	11
Write-offs charged against the allowance	(12)
Recoveries collected	2
Ending balance	$ 20