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Financing Arrangements and Derivative Financial Instruments - Other Narrative (Details)
$ in Millions
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity $ 9,586
Credit arrangements, unused amount $ 3,098
Debt, percentage bearing variable interest 31.00%
Long-term Debt  
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity $ 8,683
Credit arrangements, unused amount 2,747
Short-term Debt  
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity 903
Credit arrangements, unused amount $ 351
Variable Rate Credit Arrangements  
Debt Instrument [Line Items]  
Interest rate 2.63%