v3.25.1
Sales of Certain Receivables - Schedule of Factoring Arrangement (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Other current liabilities $ 1,881 $ 1,965
Other long-term liabilities 4,139 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 1,581 1,616
Other current liabilities 456 409
Other long-term liabilities 14 32
Net cash proceeds since inception 1,442 1,468
Of which:    
Change in net cash proceeds during the year-to-date period (26) (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 126 116
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