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 |
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| 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 | ||||||
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