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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, 2019
Dec. 31, 2018
Liabilities    
Carrying amount of investments in equity securities that do not have readily determinable fair values $ 65 $ 84
Quoted prices in active markets for identical assets (Level 1)    
Liabilities    
Short-term borrowings 0 0
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 5,348 1,609
Long-term debt and finance lease obligations, excluding fair value hedges 32,731 34,024
Total liabilities 38,079 35,633
Significant other observable inputs (Level 2)    
Liabilities    
Short-term borrowings 306 3,693
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 9 8
Long-term debt and finance lease obligations, excluding fair value hedges 22 28
Total liabilities 337 3,729
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
Book value    
Liabilities    
Short-term borrowings 306 3,699
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 5,343 1,609
Long-term debt and finance lease obligations, excluding fair value hedges 31,712 35,468
Total liabilities 37,361 40,776
Approximate fair value    
Liabilities    
Short-term borrowings 306 3,693
Current portion of long-term debt and finance lease obligations, excluding fair value hedges 5,357 1,617
Long-term debt and finance lease obligations, excluding fair value hedges 32,753 34,052
Total liabilities $ 38,416 $ 39,362