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Sale of Equipment Installment Receivables (Summary of WarnerMedia Receivables Sold) (Details) - WarnerMedia [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Transfer Of Financial Assets Accounted For As Sales [Line Items]      
Gross receivables sold/cash proceeds received [1] $ 11,989 $ 0 $ 0
Collections reinvested under revolving agreement 7,689 0 0
Net cash proceeds received (remitted) 4,300 0 0
Net receivables sold [2] 11,604 0 0
Guarantee obligation recorded 530 $ 0 $ 0
Initial sale of receivables $ 4,300    
[1] Includes initial sale of receivables of $4,300 for the year ended December 31, 2019.
[2] Receivables net of allowance, return and incentive reserves and imputed interest.