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Fair Value Measurements and Financial Instruments - Debt Excluding Capital Leases (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value $ 148,364 $ 148,583
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value 146,813 145,610
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value 91,148 86,806
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value 55,665 58,804
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value $ 0 $ 0