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Fair Value of Financial Instruments and Risk Management (Interest Rate Risk) (Details) - Interest Rate Swap - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Mar. 31, 2020
Oct. 31, 2018
Derivatives, Fair Value [Line Items]        
Derivative, notional amount     $ 400,000,000 $ 500,000,000
Interest rate derivative assets (liabilities), net $ (16,000,000) $ (33,000,000)    
Unrealized loss on derivatives 16,000,000 33,000,000    
Other Current Liabilities        
Derivatives, Fair Value [Line Items]        
Interest rate derivative assets (liabilities), net (15,000,000) (15,000,000)    
Other Liabilities        
Derivatives, Fair Value [Line Items]        
Interest rate derivative assets (liabilities), net (4,000,000) $ (18,000,000)    
Other Assets        
Derivatives, Fair Value [Line Items]        
Interest rate derivative assets (liabilities), net $ 3,000,000      
LIBOR        
Derivatives, Fair Value [Line Items]        
Fixed interest rate     0.965% 3.055%