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Financing Arrangements - Notes Payable (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Short-term Debt [Line Items]    
Notes Payable, Current $ 2,392 $ 294
Commercial paper    
Short-term Debt [Line Items]    
Short-term debt 197 274
Short-term borrowings to banks    
Short-term Debt [Line Items]    
Short-term debt $ 2,195 $ 20