v3.22.0.1
Sales of Certain Receivables - Sales of Receivables and Continuing Involvement (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Other current assets $ 2,005 $ 2,496  
Other long-term assets 3,232 2,779  
Other current liabilities 967 810  
Other long-term liabilities 5,097 5,412  
Of which:      
Gain (loss) on sale of receivables (15) (36) $ (130)
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Derecognized net service receivables and EIP receivables 2,492 2,528  
Other current assets 655 766  
Carrying amounts of deferred purchase price assets 779 884  
Other long-term assets 125 120  
Other current liabilities 348 357  
Other long-term liabilities 0 4  
Net cash proceeds since inception 1,754 1,715  
Of which:      
Change in net cash proceeds during the year-to-date period 39 (229)  
Net cash proceeds funded by reinvested collections 1,715 1,944  
Service receivables and EIP receivables 1,000 1,200  
Gain (loss) on sale of receivables (15) (36) $ (130)
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Other current assets - of which, deferred purchase price      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Carrying amounts of deferred purchase price assets 654 764  
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Other long-term assets - of which, deferred purchase price      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Carrying amounts of deferred purchase price assets $ 125 $ 120