v3.20.2
Sale Of Equipment Installment Receivables (Equipment Installment and AT&T Revolving Programs) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross receivables: $ 3,931 $ 4,576
Outstanding portfolio of receivables derecognized from our consolidated balance sheets 8,917 9,713
Cash proceeds received, net of remittances [1] 6,429 7,211
Finance Receivables [Member] | Notes Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 2,056 2,467
Finance Receivables [Member] | Trade receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 496 477
Finance Receivables [Member] | Other Noncurrent Assets [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross receivables: 1,379 1,632
Trade receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross receivables: 3,745 3,324
Outstanding portfolio of receivables derecognized from our consolidated balance sheets 5,300 4,300
Cash proceeds received, net of remittances [1] 5,300 4,300
Trade receivables [Member] | Notes Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 0 0
Trade receivables [Member] | Trade receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 3,547 2,809
Trade receivables [Member] | Other Noncurrent Assets [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross receivables: $ 198 $ 515
[1] Represents amounts to which financial institutions remain entitled, excluding the deferred purchase price.