v3.10.0.1
Financial Instruments - Derivative Financial Instruments and Hedging Activities - Footnotes (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivative [Line Items]    
Amount of pre-tax loss to be reclassified $ 156  
Carrying value of short-term borrowings [1] 8,831 $ 9,953
Foreign currency short-term borrowings [Member]    
Derivative [Line Items]    
Carrying value of short-term borrowings 1,400  
Foreign currency long-term debt [Member]    
Derivative [Line Items]    
Principal amount 3,200  
Unsecured Debt [Member]    
Derivative [Line Items]    
Principal amount $ 1,800  
[1] Amounts may not add due to rounding.