v3.20.2
Sales of Certain Receivables - Sales of Receivables and Continuing Involvement (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Other current assets $ 2,586     $ 2,586   $ 1,972
Other long-term assets 2,326     2,326   1,891
Accounts payable and accrued liabilities 9,348     9,348   6,746
Other current liabilities 1,669     1,669   1,673
Other long-term liabilities 3,494     3,494   954
Of which:            
Losses from sales of receivables 30   $ 28 55 $ 63  
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary            
Of which:            
Maximum exposure to loss, Factoring VIE 1,100     1,100    
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 2,606     2,606   2,584
Other current assets 735     735   694
Deferred purchase price assets 841     841   781
Other long-term assets 107     107   89
Accounts payable and accrued liabilities 0     0   25
Other current liabilities 360     360   342
Other long-term liabilities 3     3   18
Net cash proceeds since inception   $ 1,944   1,839    
Of which:            
Change in net cash proceeds during the year-to-date period   65   (105)    
Net cash proceeds funded by reinvested collections   $ 1,879   1,944    
Losses from sales of receivables 30   $ 28 55 $ 63  
Factoring and EIP Securitization Arrangement | Other current assets - of which, deferred purchase price | Variable Interest Entity, Primary Beneficiary            
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Deferred purchase price assets 733     733   692
Factoring and EIP Securitization Arrangement | Other long-term assets - of which, deferred purchase price | Variable Interest Entity, Primary Beneficiary            
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Deferred purchase price assets $ 107     $ 107   $ 89