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Shareholders' Equity - Narrative (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2017 shares | Nov. 30, 2009 shares | Dec. 31, 2021 USD ($) vote director $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Aug. 02, 2013 USD ($)
Shareholders' equity, other disclosures |  |  |  |  |  |
Gross proceeds |  |  | $ 1,110,000,000 | $ 0 | $ 0 |
Series A Common Shares |  |  |  |  |  |
Shareholders' equity, other disclosures |  |  |  |  |  |
Number of votes | vote |  |  | 10 |  |  |
Number of directors entitled to elect shares | director |  |  | 8 |  |  |
Common Shares |  |  |  |  |  |
Shareholders' equity, other disclosures |  |  |  |  |  |
Number of votes | vote |  |  | 1 |  |  |
Number of directors entitled to elect shares | director |  |  | 4 |  |  |
Share repurchases |  |  |  |  |  |
Repurchase authorization |  |  |  |  |  | $ 250,000,000
Repurchase authorization, maximum dollar value |  |  | $ 177,000,000 |  |  |
Common Shares | Share Conversion |  |  |  |  |  |
Shareholders' equity, other disclosures |  |  |  |  |  |
Shares reserved (in shares) | shares |  |  | 7,331,000 |  |  |
Common Shares | Tax-Deferred Savings Plan |  |  |  |  |  |
Shareholders' equity, other disclosures |  |  |  |  |  |
Shares reserved (in shares) | shares |  |  | 90,000 |  |  |
UScellular Common Shares | UScellular |  |  |  |  |  |
Share repurchases |  |  |  |  |  |
Repurchase authorization, additional number of shares per year (in shares) | shares |  | 1,300,000 |  |  |  |
Repurchase authorization, cumulative shares authorized (in shares) | shares |  |  | 3,517,000 |  |  |
UScellular Common Shares | UScellular | Maximum |  |  |  |  |  |
Share repurchases |  |  |  |  |  |
Repurchase authorization, additional number of shares per year (in shares) | shares | 1,300,000 |  |  |  |  |
UScellular Common Shares | UScellular | Minimum |  |  |  |  |  |
Share repurchases |  |  |  |  |  |
Repurchase authorization, additional number of shares per year (in shares) | shares | 0 |  |  |  |  |
Series UU Preferred Shares |  |  |  |  |  |
Shareholders' equity, other disclosures |  |  |  |  |  |
Shares issued | shares |  |  | 16,800 |  |  |
Interest rate |  |  | 6.625% |  |  |
Shares issued (price per share) | $ / shares |  |  | $ 25,000 |  |  |
Gross proceeds |  |  | $ 420,000,000 |  |  |
Depositary shares |  |  | 16,800,000 |  |  |
Net cash proceeds |  |  | 406,000,000 |  |  |
Issuance costs |  |  | $ 14,000,000 |  |  |
Redemption price per Preferred Share | $ / shares |  |  | $ 25,000 |  |  |
Common Shares issued upon conversion | shares |  |  | 2,773.2 |  |  |
Series UU Preferred Shares | Redemption price after credit rating downgrade |  |  |  |  |  |
Shareholders' equity, other disclosures |  |  |  |  |  |
Redemption price per Preferred Share | $ / shares |  |  | $ 25,500 |  |  |
Series UU Preferred Shares | Redemption price after change in control |  |  |  |  |  |
Shareholders' equity, other disclosures |  |  |  |  |  |
Redemption price per Preferred Share | $ / shares |  |  | $ 25,000 |  |  |
Series VV Preferred Shares |  |  |  |  |  |
Shareholders' equity, other disclosures |  |  |  |  |  |
Shares issued | shares |  |  | 27,600 |  |  |
Interest rate |  |  | 6.00% |  |  |
Shares issued (price per share) | $ / shares |  |  | $ 25,000 |  |  |
Gross proceeds |  |  | $ 690,000,000 |  |  |
Depositary shares |  |  | 27,600,000 |  |  |
Net cash proceeds |  |  | 668,000,000 |  |  |
Issuance costs |  |  | $ 22,000,000 |  |  |
Redemption price per Preferred Share | $ / shares |  |  | $ 25,000 |  |  |
Common Shares issued upon conversion | shares |  |  | 2,584 |  |  |
Series VV Preferred Shares | Redemption price after credit rating downgrade |  |  |  |  |  |
Shareholders' equity, other disclosures |  |  |  |  |  |
Redemption price per Preferred Share | $ / shares |  |  | $ 25,500 |  |  |
Series VV Preferred Shares | Redemption price after change in control |  |  |  |  |  |
Shareholders' equity, other disclosures |  |  |  |  |  |
Redemption price per Preferred Share | $ / shares |  |  | $ 25,000 |  |  |
Preferred Shares |  |  |  |  |  |
Shareholders' equity, other disclosures |  |  |  |  |  |
Liquidation preference per share (in dollars per share) |  |  | $ 25,000 |  |  |
Redemption price per Preferred Share | $ / shares |  |  | $ 25,000 |  |  |

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