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Fair Value Measurements (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
6.7% Senior Notes | UScellular |  |
Financial Instruments |  |
Interest rate | 6.70% |
Book Value | Retail |  |
Financial Instruments |  |
Long-term debt | $ 1,500 | $ 1,500
Book Value | Institutional |  |
Financial Instruments |  |
Long-term debt | 536 | 535
Book Value | Other |  |
Financial Instruments |  |
Long-term debt | 1,486 | 944
Fair Value | Level 2 | Retail |  |
Financial Instruments |  |
Long-term debt | 1,156 | 1,594
Fair Value | Level 2 | Institutional |  |
Financial Instruments |  |
Long-term debt | 425 | 659
Fair Value | Level 2 | Other |  |
Financial Instruments |  |
Long-term debt | $ 1,486 | $ 944
Interest rate | Institutional and Other | Minimum |  |
Financial Instruments |  |
Fair value assumption, interest rate | 2.22% | 1.31%
Interest rate | Institutional and Other | Maximum |  |
Financial Instruments |  |
Fair value assumption, interest rate | 7.75% | 4.40%

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