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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, 2023
Dec. 31, 2022
Liabilities    
Carrying amount of investments in equity securities that do not have readily determinable fair values $ 131 $ 129
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 4,763 3,930
Long-term debt and finance lease obligations, excluding fair value hedges 49,124 53,365
Total liabilities 53,887 57,295
Book value    
Liabilities    
Short-term borrowings 2 1
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 5,113 4,152
Long-term debt and finance lease obligations, excluding fair value hedges 56,035 59,463
Total liabilities 61,150 63,616
Approximate fair value    
Liabilities    
Short-term borrowings 2 1
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 5,041 4,121
Long-term debt and finance lease obligations, excluding fair value hedges 49,633 54,073
Total liabilities 54,676 58,195
Approximate fair value | Quoted prices in active markets for identical assets (Level 1)    
Liabilities    
Short-term borrowings 0 0
Approximate fair value | Significant other observable inputs (Level 2)    
Liabilities    
Short-term borrowings 2 1
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 278 191
Long-term debt and finance lease obligations, excluding fair value hedges 509 708
Total liabilities 789 900
Approximate fair value | Significant unobservable inputs (Level 3)    
Liabilities    
Short-term borrowings 0 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 0 0
Total liabilities $ 0 $ 0