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Debt - Term Loan Facility (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2015
Long-term debt |  |  |  |
Principal amount |  | $ 2,398,000,000 | $ 2,512,000,000 |
U.S. Cellular Term loan facility | U.S. Cellular |  |  |  |
Long-term debt |  |  |  |
Principal amount |  | $ 83,000,000 | $ 191,000,000 | $ 225,000,000
Principal prepayment | $ 100,000,000 |  |  |
U.S. Cellular Term loan facility | U.S. Cellular | LIBOR rate |  |  |  |
Long-term debt |  |  |  |
Contractual spread |  | 1.75% |  |
Subordinated Agreement | U.S. Cellular Term loan facility | U.S. Cellular |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consolidated funded indebtedness |  | $ 0 |  |
Refinancing indebtedness |  | $ 0 |  |

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- Definition The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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