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Additional Financial Information - Income Statement Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Depreciation expense $ 15,112 $ 14,937 $ 14,592
Interest costs on debt balances 7,382 7,123 5,429
Net amortization of debt discount 230 219 214
Capitalized interest costs (963) (1,818) (2,030)
Advertising expense 3,976 3,847 3,556
Other income (expense), net      
Interest income 336 354 146
Other components of net periodic benefit (cost) income 300 (938) 2,386
Net debt extinguishment gains (losses) 385 308 (1,077)
Other, net (26) (37) (82)
Other income (expense), net $ 995 $ (313) $ 1,373