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Fair Value of Financial Instruments (Equity Investments) (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity investments, carrying value $ 242,000,000   $ 220,000,000
Equity investments, adjusted cost basis, amount 18,000,000   17,000,000
Equity investments, impairments 0 $ 0  
Loans Receivable [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Financing receivables $ 3,000,000   3,000,000
Financing commitments     3,000,000
Waha JVs [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investments, ownership percentage 33.00%    
Equity investments, carrying value $ 196,000,000   175,000,000
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 investments without readily determinable fair value, ownership percentage 15.00%    
FM Tech [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investments, ownership percentage 50.00%    
Equity investments, carrying value $ 17,000,000   $ 16,000,000