Stock-Based Compensation - UScellular, Restricted 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
UScellular Long-Term Incentive Plans \| Restricted Stock Units
Stock based compensation, Nonvested shares rollforward, number of shares
Nonvested stock units, beginning of period - Number of shares (in shares)	2,000,000
Granted number of shares (in shares)	1,286,000
Vested number of shares (in shares)	(526,000)
Forfeited number of shares (in shares)	(212,000)
Nonvested stock units, end of period - Number of shares (in shares)	2,548,000	2,000,000
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)	$ 31.84
Granted weighted average grant date fair value (USD per share)	21.15	$ 30.35	$ 36.68
Vested weighted average grant date fair value (USD per share)	28.73
Forfeited weighted average grant date fair value (USD per share)	28.93
Nonvested stock units - end of period weighted average grant date fair value (USD per share)	$ 27.26	$ 31.84
Shares issued and granted under stock compensation plans
Fair value of vested stock units	$ 12	$ 9	$ 22
Award vesting period	3 years

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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