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Financial Instruments - Derivative Financial Instruments and Hedging Activities - Footnotes (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Pre-tax gain expected to be reclassified within the next 12 months $ 120  
Short-term debt [1] 7,385 $ 9,953
Unsecured Debt [Member]    
Derivative [Line Items]    
Long-term debt 1,800  
Foreign currency short-term borrowings [Member]    
Derivative [Line Items]    
Short-term debt 1,500  
Foreign currency Long-term debt [Member]    
Derivative [Line Items]    
Long-term debt $ 3,200  
[1] Amounts may not add due to rounding.