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Credit Losses on Financial Instruments (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2024
USD ($)
Financing Receivable, Allowance for Credit Loss  
Beginning balance $ 34
Provision for expected losses 29
Write-offs charged against the allowance (29)
Ending balance 35
Recoveries collected 1
Business Portfolio  
Financing Receivable, Allowance for Credit Loss  
Beginning balance 14
Provision for expected losses 7
Write-offs charged against the allowance (6)
Ending balance 15
Recoveries collected 0
Mass Market Portfolio  
Financing Receivable, Allowance for Credit Loss  
Beginning balance 20
Provision for expected losses 22
Write-offs charged against the allowance (23)
Ending balance 20
Recoveries collected $ 1