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Fair Value of Financial Instruments (Equity Investments) (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]          
Equity investments, carrying value $ 248,000,000   $ 248,000,000   $ 220,000,000
Equity investments, adjusted cost basis, amount 18,000,000   18,000,000   17,000,000
Equity investments, impairments $ 0 $ 0 $ 0 $ 0  
Loans Receivable          
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]          
Financing receivables         3,000,000
Financing commitments         3,000,000
Waha JVs          
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]          
Equity method investments, ownership percentage 33.00%   33.00%    
Equity investments, carrying value $ 201,000,000   $ 201,000,000   175,000,000
CCI          
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]          
Equity investments, adjusted cost basis, amount $ 15,000,000   $ 15,000,000    
CCI | Immediate Family Member of Management          
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]          
Equity investments without readily determinable fair value, ownership percentage 15.00%   15.00%    
FM Tech          
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]          
Equity method investments, ownership percentage 50.00%   50.00%    
Equity investments, carrying value $ 17,000,000   $ 17,000,000   $ 16,000,000