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Debt - Narrative (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2024 USD ($) note | Dec. 31, 2023 USD ($) | Apr. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2021 agreement | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  | $ 8,600,000,000 | $ 17,800,000,000 |
Repayments of debt and capital lease obligations |  |  |  |  |  | 10,600,000,000 | 13,600,000,000 |
Repayments of debt |  |  |  |  |  | 2,022,000,000 |  |
Facility Capacity |  | $ 20,500,000,000 |  |  |  | 20,500,000,000 |  |
Principal Amount Outstanding |  | 6,618,000,000 |  |  |  | 6,618,000,000 |  |
Value of purchase assets financed |  |  |  |  |  | 3,800,000,000 | 6,000,000,000 |
Less long-term debt maturing within one year |  | 12,973,000,000 |  |  |  | 12,973,000,000 | 9,813,000,000 |
Gain (loss) on debt extinguishment |  |  |  |  |  | 308,000,000 | (1,100,000,000) | $ (3,600,000,000)
Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, number of notes | note | 2 |  |  |  |  |  |  |
Alternative Financing Facility | Network Equipment |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Value of purchase assets financed |  |  |  |  |  | 1,300,000,000 | 832,000,000 | $ 461,000,000
Less long-term debt maturing within one year |  | 2,200,000,000 |  |  |  | 2,200,000,000 | 1,700,000,000 |
Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount drawn from credit facilities |  |  |  | $ 500,000,000 |  |  |  |
Facility Capacity |  |  |  | 500,000,000 |  |  |  |
Principal Amount Outstanding |  | 0 |  |  |  | 0 |  |
Asset-Backed Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  | 6,600,000,000 | 10,700,000,000 |
Repayments of debt |  |  |  |  |  | 4,400,000,000 | 4,900,000,000 |
Secured debt, carrying value |  | 22,200,000,000 |  |  |  | 22,200,000,000 |  |
Green Bond |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  | 1,000,000,000 | 1,000,000,000 |
Commercial Paper |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from commercial paper |  |  |  |  |  | 15,900,000,000 |  |
Repayments of short-term debt |  |  |  |  |  | 16,100,000,000 |  |
Commercial paper, amount outstanding |  | 0 |  |  |  | 0 |  |
Asset Backed Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal Amount Issued |  | 4,419,000,000 |  |  |  | 4,419,000,000 |  |
Asset Backed Notes | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | $ 408,000,000 |  |  |  |  |  |  |
Principal Amount Issued | $ 1,900,000,000 |  |  |  |  |  |  |
Asset Backed Notes | Subsequent event | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 4.867% |  |  |  |  |  |  |
Asset Backed Notes | Subsequent event | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 5.028% |  |  |  |  |  |  |
Asset Backed Notes | Senior asset-backed notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 3,700,000,000 | $ 4,300,000,000 |
Asset Backed Notes | Term One | Senior asset-backed notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt revolving period |  |  |  |  |  | 18 months |  |
Asset Backed Notes | Term Two | Senior asset-backed notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt revolving period |  |  |  |  |  | 2 years |  |
Asset Backed Notes | Term Three | Senior asset-backed notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt revolving period |  |  |  |  |  | 3 years |  |
Asset Backed Notes | Term Four | Senior asset-backed notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt revolving period |  |  |  |  |  | 5 years |  |
2021 ABS Financing Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 700,000,000 |  |  |  |  |
Amount drawn from credit facilities |  | $ 925,000,000 |  | 325,000,000 |  |  |  |
Debt revolving period |  | 18 months |  |  |  |  |  |
Number of loan agreements | agreement |  |  |  |  | 2 |  |  |
Outstanding balance |  | $ 8,500,000,000 |  |  |  | $ 8,500,000,000 |  |
2021 ABS Financing Facility | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | $ 900,000,000 |  |  |  |  |  |  |
2022 ABS Financing Facility | Senior asset-backed notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount drawn from credit facilities |  | $ 450,000,000 |  | $ 500,000,000 |  |  |  |
Debt revolving period |  | 1 year |  |  |  |  |  |
Outstanding balance |  | $ 3,000,000,000 |  |  |  | 3,000,000,000 |  |
Guarantee of Debentures of Operating Telephone Company Subsidiaries |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount outstanding in connection with the guarantee of debt obligations |  | $ 614,000,000 |  |  |  | $ 614,000,000 |  |

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