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Financing Arrangements (Schedule of Notes Payable) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Short-term Debt [Line Items]    
Notes payable $ 12 $ 294
Commercial paper    
Short-term Debt [Line Items]    
Notes payable 0 274
Short-term borrowings to banks    
Short-term Debt [Line Items]    
Notes payable $ 12 $ 20