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Debt (Tables) | 9 Months Ended
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Sep. 30, 2016
Debt Disclosure [Abstract] |
Debt instrument facilities | The following table summarizes the terms of such revolving credit facilities as of September 30, 2016:
| TDS |  | U.S. Cellular |
(Dollars in millions) |  |  |  |  |  |
Maximum borrowing capacity | $ | 400 |  | $ | 300 |
Letters of credit outstanding | $ | 1 |  | $ | 16 |
Amount borrowed | $ | – |  | $ | – |
Amount available for use | $ | 399 |  | $ | 284 |
Illustrative borrowing rate: One-month London Interbank Offered |  |  |  |  |  |
| Rate ("LIBOR") plus contractual spread 1 |  | 2.28 | % |  | 2.28 | %
| Illustrative LIBOR Rate |  | 0.53 | % |  | 0.53 | %
| Contractual spread |  | 1.75 | % |  | 1.75 | %
Commitment fees on amount available for use 2 |  | 0.30 | % |  | 0.30 | %
Agreement date |  | June 2016 |  |  | June 2016 |
Maturity date |  | June 2021 |  |  | June 2021 |
1 | Borrowings under the revolving credit facility bear interest either at a LIBOR rate or at an alternative Base Rate as defined in the revolving credit agreement, plus an applicable margin, at TDS' or U.S. Cellular’s option. TDS and U.S. Cellular may select a borrowing period of either one, two, three or six months (or other period of twelve months or less if requested by TDS or U.S. Cellular and approved by the lenders).
2 | The revolving credit facility has commitment fees based on the unsecured senior debt ratings assigned to TDS and U.S. Cellular by certain ratings agencies.

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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