Fair Value Measurements (Details) - USD ($) $ in Millions |
Jun. 30, 2023 |
Dec. 31, 2022 |
|---|---|---|
| 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 | 536 |
| Book Value | Other | ||
| Financial Instruments | ||
| Long-term debt | 1,931 | 1,753 |
| Fair Value | Level 2 | Retail | ||
| Financial Instruments | ||
| Long-term debt | 917 | 899 |
| Fair Value | Level 2 | Institutional | ||
| Financial Instruments | ||
| Long-term debt | 381 | 395 |
| Fair Value | Level 2 | Other | ||
| Financial Instruments | ||
| Long-term debt | $ 1,931 | $ 1,753 |
| Interest rate | Institutional and Other | Minimum | ||
| Financial Instruments | ||
| Fair value assumption, interest rate | 3.52% | 3.52% |
| Interest rate | Institutional and Other | Maximum | ||
| Financial Instruments | ||
| Fair value assumption, interest rate | 8.77% | 8.28% |