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Stock-Based Compensation - TDS, Overview (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock based compensation
Stock-based compensation expense	$ 71	$ 41	$ 42
Income tax benefit	(18)	(10)	(11)
Total stock-based compensation expense, net of income taxes	53	31	31
Unrecognized compensation cost for all stock-based compensation awards	$ 64
Weighted average period for recognition of unrecognized compensation cost for all stock-based compensation awards	1 year 8 months 12 days
Tax benefit from exercise of stock options and other awards	$ 18
Selling, general and administrative expense
Stock based compensation
Stock-based compensation expense	63	36	36
Cost of services expense
Stock based compensation
Stock-based compensation expense	8	5	6
Long-Term Incentive Plans | Stock Options
Stock based compensation
Stock-based compensation expense	0	0	1
Long-Term Incentive Plans | Restricted Stock Units
Stock based compensation
Stock-based compensation expense	41	32	28
Long-Term Incentive Plans | Performance Share Units
Stock based compensation
Stock-based compensation expense	28	7	11
Non-Employee Directors' Plan
Stock based compensation
Stock-based compensation expense	$ 2	$ 2	$ 2
Non-Employee Directors' Plan | TDS | Common Shares
Stock based compensation
Shares reserved	451,000
Shares issued	49,000	81,000	51,000
TDS Long-Term Incentive Plans | TDS | Common Shares
Stock based compensation
Shares reserved	24,798,000
Dividend Reinvestment Plan | TDS | Series A Common Shares
Stock based compensation
Shares reserved	561,000
Purchase price, percent	95.00%
Dividend Reinvestment Plan | TDS | Common Shares
Stock based compensation
Shares reserved	2,075,000
Purchase price, percent	95.00%

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