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Taxes - Schedule of Deferred Taxes (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred Tax Assets    
Employee benefits $ 3,913 $ 3,888
Tax loss, credit, and other carry forwards 1,922 1,940
Lease liabilities 5,480 5,395
Other - assets 1,708 1,591
Deferred tax assets, gross 13,023 12,814
Valuation allowances (1,341) (1,347)
Deferred tax assets 11,682 11,467
Deferred Tax Liabilities    
Spectrum and other intangible amortization 28,535 25,851
Depreciation 20,884 21,388
Lease right-of-use assets 5,200 5,007
Other - liabilities 2,696 2,489
Deferred tax liabilities 57,315 54,735
Net deferred tax liability $ 45,633 $ 43,268