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Stock-Based Compensation - UScellular, Performance Stock Units (Details) - Common Shares - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Shares issued and granted under stock compensation plans |  |  |
Award vesting period | 3 years |  |
Performance Share Units | UScellular Long-Term Incentive Plans |  |  |
Stock based compensation, Nonvested shares rollforward, number of shares |  |  |
Nonvested stock units, beginning of period - Number of shares (in shares) | 1,248,000 |  |
Granted number of shares (in shares) | 643,000 |  |
Vested number of shares (in shares) | (300,000) |  |
Forfeited number of shares (in shares) | (134,000) |  |
Nonvested stock units, end of period - Number of shares (in shares) | 1,457,000 | 1,248,000 |
Stock based compensation, Nonvested shares weighted average grant date fair value |  |  |
Nonvested stock units - beginning of period weighted average grant date fair value (USD per share) | $ 32.51 |  |
Granted weighted average grant date fair value (USD per share) | 21.26 | $ 31.35 | $ 37.67
Vested weighted average grant date fair value (USD per share) | 28.41 |  |
Forfeited weighted average grant date fair value (USD per share) | 26.53 |  |
Nonvested stock units - end of period weighted average grant date fair value (USD per share) | $ 27.37 | $ 32.51 |
Shares issued and granted under stock compensation plans |  |  |
Fair value of vested stock units | $ 7 | $ 6 | $ 22
Award vesting period | 3 years |  |
Performance Share Units | UScellular Long-Term Incentive Plans | Chief Executive Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance share awards target | 100.00% |  |
Performance Share Units | UScellular Long-Term Incentive Plans | 2021 and 2022 grants |  |  |
Shares issued and granted under stock compensation plans |  |  |
Performance period | 3 years |  |
Performance Share Units | UScellular Long-Term Incentive Plans | 2023 grants |  |  |
Shares issued and granted under stock compensation plans |  |  |
Performance period | 1 year |  |
Performance Share Units | UScellular Long-Term Incentive Plans | UScellular | 2021 grants |  |  |
Shares issued and granted under stock compensation plans |  |  |
Incremental expense of plan modification | $ 3 |  |
Performance Share Units | UScellular Long-Term Incentive Plans | UScellular | 2022 grants |  |  |
Shares issued and granted under stock compensation plans |  |  |
Incremental expense of plan modification | $ 1 |  |
Performance Share Units | UScellular Long-Term Incentive Plans | Minimum | 2021 and 2022 grants |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance share awards target | 75.00% |  |
Performance Share Units | UScellular Long-Term Incentive Plans | Minimum | 2023 grants |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance share awards target | 0.00% |  |
Performance Share Units | UScellular Long-Term Incentive Plans | Maximum | 2021 and 2022 grants |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance share awards target | 200.00% |  |
Performance Share Units | UScellular Long-Term Incentive Plans | Maximum | 2023 grants |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance share awards target | 150.00% |  |
Performance Share Units | UScellular Long-Term Incentive Plans | Maximum | Discretionary | 2021 and 2022 grants |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance share awards target | 100.00% |  |

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