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Financing Arrangements and Derivative Financial Instruments - Other Narrative (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity $ 11,951
Credit arrangements, unused amount $ 4,112
Debt, percentage bearing variable interest 23.00%
Long-term Debt  
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity $ 10,983
Credit arrangements, unused amount 3,633
Short-term Debt  
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity 968
Credit arrangements, unused amount $ 479
Variable Rate Credit Arrangements  
Debt Instrument [Line Items]  
Interest rate 2.98%