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Fair Value of Financial Instruments (Equity Investments) (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity investments, carrying value $ 220,000,000 $ 196,000,000  
Equity investments, adjusted cost basis, amount 17,000,000 18,000,000  
Equity investments, impairments $ 0 0 $ 0
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 $ 175,000,000 $ 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    
CCI [Member] | Immediate Family Member of Management [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity investment, ownership percentage 15.00%    
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