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Additional Financial Information - Income Statement Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Depreciation expense $ 14,937 $ 14,592 $ 14,119
Interest costs on debt balances 7,123 5,429 5,148
Net amortization of debt discount 219 214 178
Capitalized interest costs (1,818) (2,030) (1,841)
Advertising expense 3,847 3,556 3,394
Other income (expense), net      
Interest income 354 146 48
Other components of net periodic benefit (cost) income (938) 2,386 3,785
Net debt extinguishment gains (losses) 308 (1,077) (3,541)
Other, net (37) (82) 20
Other income (expense), net $ (313) $ 1,373 $ 312