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Financing Arrangements and Derivative Financial Instruments - Other Narrative (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity $ 8,618
Credit arrangements, unused amount $ 2,278
Debt, percentage bearing variable interest 41.00%
Long-term Debt  
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity $ 7,749
Credit arrangements, unused amount 2,109
Short-term Debt  
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity 869
Credit arrangements, unused amount $ 169
Variable Rate Credit Arrangements  
Debt Instrument [Line Items]  
Interest rate 3.41%