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Financing Arrangements and Derivative Financial Instruments - Other Narrative (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity $ 9,707
Credit arrangements, unused amount $ 3,881
Debt, percentage bearing variable interest 24.00%
Long-term Debt  
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity $ 8,632
Credit arrangements, unused amount 3,242
Short-term Debt  
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity 1,075
Credit arrangements, unused amount $ 639
Variable Rate Credit Arrangements  
Debt Instrument [Line Items]  
Interest rate 2.79%