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Credit Losses on Financial Instruments - Finance Receivable, Allowance for Credit Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss      
Beginning balance $ 34 $ 36 $ 38
Provision for expected losses 45 66 60
Write-offs charged against the allowance (52) (69) (64)
Recoveries collected 2 1 2
Ending balance 29 34 36
Business      
Financing Receivable, Allowance for Credit Loss      
Beginning balance 14 20 19
Provision for expected losses 9 20 13
Write-offs charged against the allowance (10) (26) (14)
Recoveries collected 0 0 2
Ending balance 13 14 20
Mass Markets      
Financing Receivable, Allowance for Credit Loss      
Beginning balance 20 16 19
Provision for expected losses 36 46 47
Write-offs charged against the allowance (42) (43) (50)
Recoveries collected 2 1 0
Ending balance $ 16 $ 20 $ 16