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Fair Value of Financial Instruments (Equity Investments) (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity investments, adjusted cost basis, amount $ 17,000,000   $ 18,000,000
Equity investments, carrying value 205,000,000   196,000,000
Equity investments, impairments 0 $ 0  
Loans Receivable [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Financing commitments $ 6,000,000    
Waha JVs [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investment, ownership percentage 33.00%    
Equity investments, carrying value $ 165,000,000   $ 174,000,000
CCI [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity investments, adjusted cost basis, amount $ 15,000,000    
FM Tech [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investment, ownership percentage 50.00%    
Equity investments, carrying value $ 16,000,000