v3.25.4
Fair Value Measurements and Financial Instruments - Fair Value of Short-term and Long-term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value $ 91,664 $ 81,552
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value 62,640 55,464
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value 0 0
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value 155,639 141,665
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value $ 154,304 $ 137,016