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Acquisitions, Investments and Dispositions (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2016
USD ($)
Jan. 31, 2016
USD ($)
MW
Dec. 31, 2018
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]            
Guarantee obligations maximum exposure       $ 2,705,000,000 $ 2,856,000,000  
Ownership interest, percentage           45.70%
Construction work in progress       1,115,000,000 $ 1,003,000,000  
Mountain Valley Pipeline LLC            
Schedule of Equity Method Investments [Line Items]            
Payments to acquire equity method investments   $ 18,000,000        
Equity method ownership (percent)   12.50%        
Texas Solar 7 | Texas            
Schedule of Equity Method Investments [Line Items]            
Generating capacity | MW   106        
Payments to acquire business   $ 227,000,000        
Non-utility construction work in progress   218,000,000        
Other receivables   9,000,000        
Electric | Texas Solar 7 | Texas            
Schedule of Equity Method Investments [Line Items]            
Consideration transferred   375,000,000        
Subsequent Event | Stagecoach Gas Services LLC            
Schedule of Equity Method Investments [Line Items]            
Payments to acquire equity method investments $ 975,000,000          
Equity method ownership (percent) 50.00%          
Electric Transmission Project | Discontinued Operations, Disposed of by Sale            
Schedule of Equity Method Investments [Line Items]            
Payment for leases   $ 7,600,000        
Construction work in progress       96,000,000    
Financial and Performance Guarantee, Other            
Schedule of Equity Method Investments [Line Items]            
Guarantee obligations maximum exposure       $ 75,000,000    
Financial and Performance Guarantee, Other | Subsequent Event            
Schedule of Equity Method Investments [Line Items]            
Guarantee obligations maximum exposure $ 946,000,000          
Scenario, Forecast | Gas | Minimum | Mountain Valley Pipeline LLC            
Schedule of Equity Method Investments [Line Items]            
Payments to acquire equity method investments     $ 3,000,000,000      
Scenario, Forecast | Gas | Maximum | Mountain Valley Pipeline LLC            
Schedule of Equity Method Investments [Line Items]            
Payments to acquire equity method investments     $ 3,500,000,000      
CET Electric            
Schedule of Equity Method Investments [Line Items]            
Ownership interest, percentage   45.70%