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Basis of Presentation - Performance Obligation, Expected Timing (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Natural Gas Revenues $ 5,943,000,000  
Price per barrel which trigger provision adjustments 50  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01    
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Natural Gas Revenues 407,000,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Expected timing   9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01    
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Natural Gas Revenues 599,000,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Expected timing   1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01    
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Natural Gas Revenues 418,000,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Expected timing   1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01    
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Natural Gas Revenues 412,000,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Expected timing   1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01    
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Natural Gas Revenues 412,000,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Expected timing   1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01    
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Natural Gas Revenues $ 3,695,000,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Expected timing