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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
Jun. 30, 2023
Dec. 31, 2022
Liabilities    
Carrying amount of investments in equity securities that do not have readily determinable fair values $ 124 $ 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 4,816 3,930
Long-term debt and finance lease obligations, excluding fair value hedges 50,869 53,365
Total liabilities 55,685 57,295
Book value    
Liabilities    
Short-term borrowings   1
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 5,203 4,152
Long-term debt and finance lease obligations, excluding fair value hedges 56,153 59,463
Total liabilities 61,356 63,616
Approximate fair value    
Liabilities    
Short-term borrowings   1
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 5,096 4,121
Long-term debt and finance lease obligations, excluding fair value hedges 51,394 54,073
Total liabilities 56,490 58,195
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   1
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 280 191
Long-term debt and finance lease obligations, excluding fair value hedges 525 708
Total liabilities 805 900
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 0 0
Total liabilities $ 0 $ 0