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v3.21.1

Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
7.0% Senior Notes |  |
Financial Instruments |  |
Interest rate | 7.00% |
6.875% Senior Notes |  |
Financial Instruments |  |
Interest rate | 6.875% |
6.625% Senior Notes |  |
Financial Instruments |  |
Interest rate | 6.625% |
5.875% Senior Notes |  |
Financial Instruments |  |
Interest rate | 5.875% |
7.25% 2063 Senior Notes | UScellular |  |
Financial Instruments |  |
Interest rate | 7.25% |
7.25% 2064 Senior Notes | UScellular |  |
Financial Instruments |  |
Interest rate | 7.25% |
6.25% Senior Notes | UScellular |  |
Financial Instruments |  |
Interest rate | 6.25% |
6.95% Senior Notes | UScellular |  |
Financial Instruments |  |
Interest rate | 6.95% |
6.7% Senior Notes | UScellular |  |
Financial Instruments |  |
Interest rate | 6.70% |
5.5% Senior Notes | UScellular |  |
Financial Instruments |  |
Interest rate | 5.50% |
Book Value | Retail |  |
Financial Instruments |  |
Long-term debt | $ 2,753 | $ 2,753
Book Value | Institutional |  |
Financial Instruments |  |
Long-term debt | 535 | 535
Book Value | Other |  |
Financial Instruments |  |
Long-term debt | 796 | 230
Fair Value | Level 2 | Retail |  |
Financial Instruments |  |
Long-term debt | 2,814 | 2,809
Fair Value | Level 2 | Institutional |  |
Financial Instruments |  |
Long-term debt | 661 | 707
Fair Value | Level 2 | Other |  |
Financial Instruments |  |
Long-term debt | $ 796 | $ 230
Interest rate | Institutional and Other | Minimum |  |
Financial Instruments |  |
Fair value assumption, interest rate | 1.31% | 1.35%
Interest rate | Institutional and Other | Maximum |  |
Financial Instruments |  |
Fair value assumption, interest rate | 4.48% | 3.75%

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