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Debt Short-term Financing (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Short-term Financing [Line Items]  
Line of Credit Facility, Remaining Borrowing Capacity $ 108,000,000
Revolving Credit Facility [Member]  
Short-term Financing [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000,000,000.00
Debt, Covenant, Minimum Consolidated Interest Coverage Ratio 3.5
Line of Credit Facility, Amount Outstanding $ 0
Letters of Credit Outstanding, Amount $ 31,000,000
Commercial Paper Programs [Member] | U.S. Commercial Paper Program [Member]  
Short-term Financing [Line Items]  
Maximum Period to Maturity Allowed Under Program 397 days
Commercial Paper Programs [Member] | Euro Commercial Paper Program [Member]  
Short-term Financing [Line Items]  
Maximum Period to Maturity Allowed Under Program 183 days