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Financial Instruments and Fair Value Measures - Bases Used To Measure The Approximate Fair Values Of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Liabilities    
Carrying amount of investments in equity securities that do not have readily determinable fair values $ 172 $ 169
Quoted prices in active markets for identical assets (Level 1)    
Liabilities    
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 1,991 6,620
Long-term debt and finance lease obligations, excluding fair value hedges and financing liability 57,647 53,441
Total liabilities 59,638 60,061
Book value    
Liabilities    
Short-term borrowings 3,790 0
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 2,017 6,797
Long-term debt and finance lease obligations, excluding fair value hedges and financing liability 62,645 60,243
Total liabilities 68,452 67,040
Approximate fair value    
Liabilities    
Short-term borrowings 3,785  
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 2,010 6,767
Long-term debt and finance lease obligations, excluding fair value hedges and financing liability 60,084 55,836
Total liabilities 65,879 62,603
Approximate fair value | Quoted prices in active markets for identical assets (Level 1)    
Liabilities    
Short-term borrowings 0  
Approximate fair value | Significant other observable inputs (Level 2)    
Liabilities    
Short-term borrowings 3,785  
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 19 147
Long-term debt and finance lease obligations, excluding fair value hedges and financing liability 2,437 2,395
Total liabilities 6,241 2,542
Approximate fair value | Significant unobservable inputs (Level 3)    
Liabilities    
Short-term borrowings 0  
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 0 0
Long-term debt and finance lease obligations, excluding fair value hedges and financing liability 0 0
Total liabilities $ 0 $ 0