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Intangible Assets - Narrative (Details) $ in Millions		9 Months Ended		12 Months Ended	39 Months Ended
	Oct. 01, 2021 USD ($)	Sep. 30, 2021 USD ($) license	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2024 USD ($)
Licenses
Cash paid for licenses		$ 1,268	$ 169
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	$ 36				$ 181

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The total winning bid amount in a FCC license auction.

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Federal Communications Commission License Auction, Upfront Payment

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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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=123570139&loc=d3e3213-108585

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