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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