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DEBT (Credit Facilities) (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Cash and cash equivalents $ 342,000,000 $ 1,192,000,000
Credit Facilities    
Debt Instrument [Line Items]    
Amount outstanding 0  
Remaining borrowing capacity 1,300,000,000  
Secured Receivables Credit Facility    
Debt Instrument [Line Items]    
Remaining borrowing capacity 529,000,000  
Secured Receivables Credit Facility | Letter of Credit    
Debt Instrument [Line Items]    
Credit facility capacity 100,000,000  
Secured Receivables Credit Facility | Loan commitment maturing October 2020    
Debt Instrument [Line Items]    
Credit facility capacity 250,000,000  
Secured Receivables Credit Facility | Loan commitment maturing October 2021    
Debt Instrument [Line Items]    
Credit facility capacity 250,000,000  
Senior Unsecured Revolving Credit Facility    
Debt Instrument [Line Items]    
Remaining borrowing capacity $ 750,000,000  
Senior Unsecured Revolving Credit Facility | Maximum    
Debt Instrument [Line Items]    
Leverage ratio 350.00%