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Taxes - Schedule of Deferred Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets
Employee benefits	$ 3,676	$ 3,913
Tax loss, credit, and other carry forwards	1,719	1,922
Lease liabilities	5,138	5,480
Other - assets	1,735	1,708
Deferred tax assets, gross	12,268	13,023
Valuation allowances	(1,399)	(1,341)
Deferred tax assets	10,869	11,682
Deferred tax liabilities
Spectrum and other intangible amortization	29,302	28,535
Depreciation	20,424	20,884
Lease right-of-use assets	4,822	5,200
Other - liabilities	2,904	2,696
Deferred tax liabilities	57,452	57,315
Net deferred tax liability	$ 46,583	$ 45,633

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