v3.26.1
Fair Value Measurements and Financial Instruments - Debt Excluding Capital Leases (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value $ 169,215 $ 155,639
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value 166,276 154,304
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value 96,509 91,664
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value 69,767 62,640
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument fair value $ 0 $ 0