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Intangible Assets - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2021 USD ($) | Mar. 31, 2021 USD ($) license | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Licenses |  |  |  |
Cash paid for licenses |  | $ 1,261 | $ 26 |
Auction 107 |  |  |  |
Licenses |  |  |  |
Licenses won | license |  | 254 |  |
Total winning bid |  | $ 1,283 |  |
FCC upfront payment |  |  |  | $ 30
Auction 107 | Subsequent event |  |  |  |
Licenses |  |  |  |
Cash paid for licenses | $ 178 |  |  |

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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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