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Fair Value of Financial Instruments (Equity Investments) (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity investments, adjusted cost basis, amount $ 18,000,000   $ 18,000,000
Equity investments, impairments 0 $ 0  
Equity Investee [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity investments, carrying value 188,000,000   197,000,000
CCI [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity investments, adjusted cost basis, amount $ 15,000,000    
Waha JVs [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investment, ownership percentage 33.00%    
Waha JVs [Member] | Equity Investee [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity investments, carrying value $ 167,000,000   $ 168,000,000