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Stock-Based Compensation - TDS excluding UScellular, Stock options (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
TDS Long-Term Incentive Plans | Stock Options | TDS
Black Scholes valuation model assumptions
Expected life		6 years 3 months 18 days	6 years 2 months 12 days
Expected annual volatility rate		36.60%	35.00%
Dividend yield		2.80%	3.60%
Risk-free interest rate		1.10%	0.50%
Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Common Shares | TDS Long-Term Incentive Plans | Stock Options
Stock compensation, other information
Aggregate intrinsic value, options exercised			$ 0
Common Shares | TDS Long-Term Incentive Plans | Stock Options | TDS
Stock compensation, number of shares
Outstanding, beginning of period (in shares)	4,088,000
Exercised options (in shares)	(1,000)
Forfeited options (in shares)	(86,000)
Expired options (in shares)	(903,000)
Outstanding, end of period (in shares)	3,098,000	4,088,000
Exercisable options, end of period (in shares)	2,539,000
Stock compensation, other information
Options outstanding, beginning of period - weighted average exercise price (USD per share)	$ 25.50
Options exercised, weighted average exercise price (USD per share)	19.15
Options forfeited, weighted average exercise price (USD per share)	22.42
Options expired, weighted average exercise price (USD per share)	22.82
Options outstanding, end of period - weighted average exercise price (USD per share)	26.37	$ 25.50
Options exercisable, end of period - weighted average exercise price (USD per share)	$ 27.34
Aggregate intrinsic value, options outstanding	$ 0
Aggregate intrinsic value, options exercisable	$ 0
Weighted average remaining contractual life, outstanding	4 years 2 months 12 days
Weighted average remaining contractual life, exercisable	3 years 3 months 18 days
Options granted, weighted average grant date fair value		$ 6.86	$ 4.24
Common Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Common Shares | Maximum | TDS Long-Term Incentive Plans | Stock Options
Stock compensation, other information
Aggregate intrinsic value, options exercised	$ 1	$ 1
Terminated Employees | Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	30 days
Retired Employees | Common Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	90 days
Retired Employees | Common Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	1 year

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