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Earnings Per Share
 12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
Earnings Per Share
Note 6 Earnings Per Share
Basic earnings (loss) per share attributable to TDS common shareholders is computed by dividing Net income (loss) attributable to TDS common shareholders by the weighted average number of Common Shares outstanding during the period. Diluted earnings (loss) per share attributable to TDS common shareholders is computed by dividing Net income (loss) attributable to TDS common shareholders by the weighted average number of Common Shares outstanding during the period adjusted to include the effects of potentially dilutive securities. Potentially dilutive securities primarily include incremental shares issuable upon the exercise of outstanding stock options and the vesting of performance and restricted stock units, as calculated using the treasury stock method.
The amounts used in computing basic and diluted earnings (loss) per share attributable to TDS common shareholders were as follows:
Year Ended December 31,202420232022
(Dollars and shares in millions, except per share amounts)   
Net income (loss) attributable to TDS common shareholders used in basic earnings (loss) per share$(97)$(569)$(7)
Adjustments to compute diluted earnings (loss):
Noncontrolling interest adjustment— (1)(1)
Net income (loss) attributable to TDS common shareholders used in diluted earnings (loss) per share$(97)$(570)$(8)
Weighted average number of shares used in basic and diluted earnings (loss) per share:
Common Shares107 106 107 
Series A Common Shares7 7 7 
Weighted average number of shares used in basic and diluted earnings (loss) per share114 113 114 
Basic earnings (loss) per share attributable to TDS common shareholders$(0.85)$(5.05)$(0.07)
Diluted earnings (loss) per share attributable to TDS common shareholders$(0.85)$(5.06)$(0.07)
Certain Common Shares issuable upon the exercise of stock options or vesting of performance and restricted stock units were not included in weighted average diluted shares outstanding for the calculation of Diluted earnings (loss) per share attributable to TDS common shareholders because their effects were antidilutive. The number of such Common Shares excluded was 6 million, 6 million and 5 million for 2024, 2023 and 2022, respectively.