v3.23.1
Financial Instruments and Fair Value Measures - Bases Used To Measure The Approximate Fair Values Of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Liabilities    
Carrying amount of investments in equity securities that do not have readily determinable fair values $ 115 $ 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 2,703 3,930
Long-term debt and finance lease obligations, excluding fair value hedges 55,058 53,365
Total liabilities 57,761 57,295
Book value    
Liabilities    
Short-term borrowings 1 1
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 2,816 4,152
Long-term debt and finance lease obligations, excluding fair value hedges 59,590 59,463
Total liabilities 62,407 63,616
Approximate fair value    
Liabilities    
Short-term borrowings 1 1
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 2,793 4,121
Long-term debt and finance lease obligations, excluding fair value hedges 55,784 54,073
Total liabilities 58,578 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 1 1
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 90 191
Long-term debt and finance lease obligations, excluding fair value hedges 726 708
Total liabilities 817 900
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