Acquisitions, Dispositions And Other Adjustments (Spectrum Auctions Narrative) (Details) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2020 |
Dec. 31, 2019 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Jun. 30, 2020 |
|
| Licensing Agreements | |||||
| Indefinite-lived Intangible Assets [Line Items] | |||||
| Payments to acquire intangible assets | $ 2,379 | $ 949 | $ 1,186 | ||
| 24 GHz Licenses | |||||
| Indefinite-lived Intangible Assets [Line Items] | |||||
| Payments to acquire intangible assets | $ 982 | ||||
| FiberTower Corporation | 39 GHz Licenses | |||||
| Indefinite-lived Intangible Assets [Line Items] | |||||
| Book value of indefinite-lived intangible assets | $ 300 | ||||
| Gain on disposition of intangible asset | $ 900 | ||||
| Value of consideration received in a noncash transaction | $ 1,200 | ||||