v3.25.1
Sales of Certain Receivables - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Variable Interest Entity [Line Items]      
Losses from sales of receivables $ 22 $ 21  
Variable Interest Entity, Primary Beneficiary | Collateral Pledged | Service Receivable Sale Arrangement      
Variable Interest Entity [Line Items]      
Gross receivables 278   $ 286
EIP Securitization Arrangement      
Variable Interest Entity [Line Items]      
Revolving receivables facility, maximum borrowing capacity 1,300   1,300
Factoring Arrangement | Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Revolving receivables facility, outstanding borrowings 775   775
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Losses from sales of receivables 22 $ 21  
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Collateral Pledged | EIP Sale Arrangement      
Variable Interest Entity [Line Items]      
Gross EIP receivables 510   505
Factoring and EIP Securitization Arrangement | Level 3 | Carrying Amount | Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Carrying amounts of deferred purchase price assets $ 140   $ 148