Goodwill And Other Intangible Assets (Schedule Of Indefinite-Life Intangible Assets Not Subject To Amortization) (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Indefinite-lived Intangible Assets [Line Items] | ||
| Gross carrying amount | $ 101,392 | $ 102,418 |
| Licenses [Member] | ||
| Indefinite-lived Intangible Assets [Line Items] | ||
| Gross carrying amount | 83,623 | 84,442 |
| Orbital Slots [Member] | ||
| Indefinite-lived Intangible Assets [Line Items] | ||
| Gross carrying amount | 11,702 | 11,702 |
| Trademarks and trade names [Member] | ||
| Indefinite-lived Intangible Assets [Line Items] | ||
| Gross carrying amount | $ 6,067 | $ 6,274 |