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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | Feb. 25, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Loss Contingency, Estimate [Abstract] |  |  |
Accrual for legal proceedings and unasserted claims |  | $ 2 |
Maximum |  |  |
Loss Contingency, Estimate [Abstract] |  |  |
Accrual for legal proceedings and unasserted claims |  |  | $ 1
U.S. Cellular |  |  |
Loss Contingency, Estimate [Abstract] |  |  |
FCC License Auction, Percent of Bid Credit in Each Auction |  | 25.00% |
Subsequent Event |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Commitment to purchase assets | $ 146 |  |

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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