v3.20.4
Financial Instruments and Fair Value Measures - Bases Used to Measure The Approximate Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Liabilities    
Carrying amount of investments in equity securities that do not have readily determinable fair values $ 102 $ 66
Book value    
Liabilities    
Short-term borrowings 34  
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 8,461 3,755
Long-term debt and finance lease obligations, excluding fair value hedges 77,283 63,021
Total liabilities 85,778 66,776
Estimate of Fair Value Measurement    
Liabilities    
Short-term borrowings 34  
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 8,542 3,760
Long-term debt and finance lease obligations, excluding fair value hedges 87,761 66,651
Total liabilities 96,337 70,411
Estimate of Fair Value Measurement | Quoted prices in active markets for identical assets (Level 1)    
Liabilities    
Short-term borrowings 0  
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 8,249 3,753
Long-term debt and finance lease obligations, excluding fair value hedges 86,137 66,631
Total liabilities 94,386 70,384
Estimate of Fair Value Measurement | Significant other observable inputs (Level 2)    
Liabilities    
Short-term borrowings 34  
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 293 7
Long-term debt and finance lease obligations, excluding fair value hedges 1,624 20
Total liabilities 1,951 27
Estimate of Fair Value Measurement | 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