v3.25.2
Sales of Certain Receivables - Schedule of Factoring Arrangement (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Other current liabilities $ 2,175 $ 1,965
Other long-term liabilities 4,014 4,000
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Derecognized net service accounts receivable and EIP receivables 1,647 1,616
Other current liabilities 387 409
Other long-term liabilities 14 32
Net cash proceeds since inception 1,419 1,468
Of which:    
Change in net cash proceeds during the year-to-date period (49) (115)
Net cash proceeds funded by reinvested collections 1,468 1,583
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Other current liabilities - of which, deferred purchase price    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying amounts of deferred purchase price assets 124 116
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Other long-term liabilities - of which, deferred purchase price    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying amounts of deferred purchase price assets $ 14 $ 32