v3.26.1
Sales of Certain Receivables - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]          
Losses from sales of receivables $ 17 $ 19 $ 37 $ 41  
EIP Securitization Arrangement          
Variable Interest Entity [Line Items]          
Revolving receivables facility, maximum borrowing capacity 1,300   1,300   $ 1,300
Factoring Arrangement | Collateral Pledged | Service Receivable Sale Arrangement          
Variable Interest Entity [Line Items]          
Gross receivables 322   322   266
Factoring Arrangement | Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Revolving receivables facility, outstanding borrowings 775   775   775
Factoring and EIP Securitization Arrangement          
Variable Interest Entity [Line Items]          
Losses from sales of receivables 17 $ 19 37 $ 41  
Factoring and EIP Securitization Arrangement | Collateral Pledged | EIP Sale Arrangement          
Variable Interest Entity [Line Items]          
Gross EIP receivables 534   534   535
Factoring and EIP Securitization Arrangement | Level 3 | Carrying Amount          
Variable Interest Entity [Line Items]          
Carrying amounts of deferred purchase price assets $ 136   $ 136   $ 130