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DEBT (Additional Infromation) (Details) - USD ($)
May 13, 2020
Jan. 24, 2020
Jun. 30, 2020
May 07, 2020
May 06, 2020
Feb. 18, 2020
Dec. 31, 2019
Uncommitted Receivables Purchase Facility, Maximum Borrowing           $ 300,000,000.0  
2028 Senior Notes              
Long-term Debt [1]     $ 1,000,000,000.0       $ 0
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   35.00%          
Debt Instrument, Redemption Price, Percentage   106.00%          
Line of Credit [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity     3,400,000,000        
Line Of Credit Facility, Accordion Feature, Increase Limit     3,500,000,000        
Long-term line of credit [2]     600,000,000.0       0
Ability to incur certain secured debt, percentage of total assets       20.00% 10.00%    
2025 Senior Secured Notes [Member]              
Long-term Debt [1]     $ 1,000,000,000.0       $ 0
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 35.00%            
Debt Instrument, Redemption Price, Percentage 109.25%            
2025 Senior Secured Notes [Member] | Regulatory Debt Facility [Member]              
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 35.00%            
Debt Instrument, Redemption Price, Percentage 104.625%            
Debt Instrument Redemption Price, Percentage of Principal Amount Remaining 65.00%            
2028 Senior Notes              
Long-term Debt   $ 1,000,000,000.0          
Interest rate   6.00%          
Proceeds from Debt, Net of Issuance Costs   $ 987,000,000.0          
2023 Senior Notes [Member]              
Interest rate   7.00%          
2025 Senior Notes [Member]              
Interest rate   7.25%          
2025 Senior Secured Notes [Member]              
Long-term Debt $ 1,000,000,000.0            
Interest rate 9.25%            
Proceeds from Debt, Net of Issuance Costs $ 984,800,000            
[1] The estimated fair value, categorized as a Level 2 measurement, was calculated based on the present value of future expected payments utilizing implied current market interest rates based on quoted prices of the outstanding senior notes.(b) As disclosed in “Note 7 - Debt”, the 2023 Senior Notes were redeemed in full on February 14, 2020.
[2] The estimated fair value approximates carrying value, categorized as a Level 2 measurement, as these borrowings bear interest based upon short-term floating market interest rates.