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Fair Value of Financial Instruments - Equity Investments - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]          
Equity investments, carrying value $ 250,000,000   $ 250,000,000   $ 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  
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 $ 206,000,000   $ 206,000,000   175,000,000
CCI          
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]          
Equity investments, ownership percentage 15.00%   15.00%    
Equity investments, adjusted cost basis, amount $ 15,000,000   $ 15,000,000    
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