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Long-Term Debt and Note Payable - Affiliate - Additional Information (Details) - Note payable - affiliate - Affiliated entity - Qwest Corporation - USD ($) $ in Millions |  | 6 Months Ended
--- | --- | ---
Sep. 30, 2022 | Jun. 30, 2023
Long-term debt |  |
Note Payable - Affiliate, funding commitment (up to) |  | $ 2,000
Note Payable - Affiliate, term subject to automatic renewal |  | 12 months
Note Payable - Affiliate, period to provide notice of intent not to renew |  | 30 days
Note Payable - Affiliate, period to pay interest from end of Interest Period |  | 30 days
Note Payable - Affiliate, outstanding principal repaid | $ 1,200 |
Note Payable - Affiliate, interest repaid | $ 43 |
Note Payable - Affiliate, outstanding |  | $ 0

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