v3.26.1
Sales of Certain Receivables - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]      
Losses from sales of receivables $ 20 $ 22  
Variable Interest Entity, Primary Beneficiary | Collateral Pledged | Service Receivable Sale Arrangement      
Variable Interest Entity [Line Items]      
Gross receivables 284   $ 266
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 20 $ 22  
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Collateral Pledged | EIP Sale Arrangement      
Variable Interest Entity [Line Items]      
Gross EIP receivables 579   535
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 $ 132   $ 130