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Taxes - Narrative (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate |  | 28.80% | 23.10% | 23.10%
Verizon Business Group goodwill impairment | $ 5,800 | $ 5,841 | $ 0 | $ 0
Undistributed earnings of foreign subsidiaries | 2,400 | 2,400 |  |
Net tax loss and credit carry forwards (tax effected) | 1,922 | 1,922 | 1,940 |
Net tax loss and credit carry forwards (tax effected), portion that will expire | 1,000 | 1,000 |  |
Operating loss carry forwards amount | 911 | 911 |  |
Valuation allowance | 1,341 | 1,341 | 1,347 |
Unrecognized tax benefits, that if recognized, would favorably affect the effective income tax rate | $ 2,300 | $ 2,300 | $ 2,500 | $ 2,800

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