Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Revenue Recognition
Receivables	$ 154	$ 193
Deferred revenue	$ 31	$ 33
Minimum
Revenue Recognition
Contract term	1 year
Amortization period	2 years
Maximum
Revenue Recognition
Contract term	5 years
Amortization period	5 years
Wireless
Revenue Recognition
Percentage of total payments due to be paid	50.00%
Wireless \| Maximum
Revenue Recognition
Contract term	36 months
RHC \| Minimum
Revenue Recognition
Contract term	3 years
RHC \| Maximum
Revenue Recognition
Contract term	5 years

Represents term of the contracts with customers.

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- Definition

Represents the threshold percentage of total due to be paid for exchange of existing equipment to new equipment

+ References

No definition available.

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- Definition

Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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