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Financial Instruments - Derivative Financial Instruments and Hedging Activities - Footnotes (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Pre-tax gain expected to be reclassified within the next 12 months $ 155  
Short-term debt [1] 10,507 $ 8,831
Unsecured Debt [Member]    
Derivative [Line Items]    
Long-term debt 1,800  
Foreign currency short-term borrowings [Member]    
Derivative [Line Items]    
Short-term debt 1,100  
Foreign currency long-term debt [Member]    
Derivative [Line Items]    
Long-term debt $ 2,000  
[1]
Amounts may not add due to rounding.