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FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2020
Jun. 30, 2020
Dec. 31, 2020
May 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]            
Amortization period   10 years        
Gain (loss) on derivatives   $ 1,000,000        
Accumulated net loss from designated or qualifying cash flow hedges     $ (21,000,000)     $ (39,000,000)
Net amount of deferred gains and losses on cash flow hedges that is expected to be reclassified within the next 12 months     1,000,000      
Forward Starting Interest Rate Swaps            
Derivative [Line Items]            
Notional amount         $ 25,000,000  
Interest Rate Lock Agreements            
Derivative [Line Items]            
Notional amount       $ 275,000,000    
Fixed-to-variable interest rate swap            
Derivative [Line Items]            
Notional amount           1,200,000,000
Proceeds from Termination of Derivative Instrument, Operating Activities $ 40,000,000          
Cash Flow Hedging            
Derivative [Line Items]            
Accumulated net loss from designated or qualifying cash flow hedges     $ 1,000,000     4,000,000
Fair Value Hedging | Long-term Debt            
Derivative [Line Items]            
Hedged liability, cumulative increase (decrease)           $ 25,000,000