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Financing Arrangements and Derivative Financial Instruments - Other Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Notes payable $ 3,302 $ 3,314
Credit arrangements 9,036  
Credit arrangements, unused amount $ 2,521  
Debt, percentage bearing variable interest rate 42.00%  
Long-term Debt    
Debt Instrument [Line Items]    
Credit arrangements $ 8,301  
Credit arrangements, unused amount 2,289  
Short-term Debt    
Debt Instrument [Line Items]    
Credit arrangements 735  
Credit arrangements, unused amount $ 232  
Variable Rate Credit Arrangements    
Debt Instrument [Line Items]    
Interest rate 4.18%