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

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

Name:	us-gaap_PaymentsToAcquireIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Intangible Assets - Narrative (Details) $ in Millions		3 Months Ended		12 Months Ended
Intangible Assets - Narrative (Details) $ in Millions	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