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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, 2022
Dec. 31, 2021
Liabilities    
Carrying amount of investments in equity securities that do not have readily determinable fair values $ 148 $ 149
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 11,549 11,329
Long-term debt and finance lease obligations, excluding fair value hedges 56,674 70,757
Total liabilities 68,223 82,086
Book value    
Liabilities    
Short-term borrowings 17 14
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 11,918 12,455
Long-term debt and finance lease obligations, excluding fair value hedges 61,202 64,113
Total liabilities 73,137 76,582
Approximate fair value    
Liabilities    
Short-term borrowings 17 14
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 11,906 11,830
Long-term debt and finance lease obligations, excluding fair value hedges 57,471 71,810
Total liabilities 69,394 83,654
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 17 14
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 357 501
Long-term debt and finance lease obligations, excluding fair value hedges 797 1,053
Total liabilities 1,171 1,568
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