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Expected Reclassification (Details)
$ in Millions
Jun. 30, 2020
USD ($)
Interest Rate Contract [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ 1
Commodity Contract [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months (28)
Excluded Components [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Hedge Gain (Loss) to be Reclassified During Next 12 Months, Excluded Components, Net $ 6