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Financial Instruments and Risk Management (Interest Rate Risk) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Oct. 10, 2018
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]      
Maximum length of time hedged in balance sheet hedge 21 days    
Interest Rate Swap      
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]      
Derivative, notional amount     $ 500,000,000
Maximum length of time hedged in balance sheet hedge 4 years    
Fair value of interest rate swaps $ 21,000,000 $ 12,000,000  
Unrealized net losses on interest rate swaps 21,000,000 12,000,000  
Interest Rate Swap | Other Current Liabilities      
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]      
Fair value of interest rate swaps 8,000,000 3,000,000  
Interest Rate Swap | Other Liabilities      
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]      
Fair value of interest rate swaps $ 13,000,000 $ 9,000,000  
Interest Rate Swap | LIBOR      
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]      
Fixed interest rate     3.055%