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Credit Losses on Financial Instruments (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
Financing Receivable, Allowance for Credit Loss  
Beginning balance $ 34
Provision for expected losses 20
Write-offs charged against the allowance (17)
Ending balance 38
Recoveries collected 1
Business Portfolio  
Financing Receivable, Allowance for Credit Loss  
Beginning balance 14
Provision for expected losses 8
Write-offs charged against the allowance (5)
Ending balance 17
Recoveries collected 0
Mass Market Portfolio  
Financing Receivable, Allowance for Credit Loss  
Beginning balance 20
Provision for expected losses 12
Write-offs charged against the allowance (12)
Ending balance 21
Recoveries collected $ 1