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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 |  | $ 1,555,000,000 | $ 1,671,000,000 |
U.S. Cellular Term loan facility |  |  |  |
Long-term debt |  |  |  |
Principal amount |  | 83,000,000 | $ 191,000,000 | $ 225,000,000
Principal prepayment | $ 100,000,000 |  |  |
Subordinated Agreement | U.S. Cellular Term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consolidated funded indebtedness |  | 0 |  |
Refinancing indebtedness |  | $ 0 |  |
LIBOR rate | U.S. Cellular Term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual spread |  | 1.75% |  |

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