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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenues $ 3,159 $ 2,855 $ 6,912 $ 6,091
Electric        
Disaggregation of Revenue [Line Items]        
Revenues 1,276   2,481  
Increase (decrease) of revenue due to Tax Cuts and Jobs Act (38)   (77)  
Electric | Other        
Disaggregation of Revenue [Line Items]        
Revenues 4   9  
Electric | Residential        
Disaggregation of Revenue [Line Items]        
Revenues 584   1,170  
Electric | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues 446   875  
Electric | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues 178   354  
Electric | Other        
Disaggregation of Revenue [Line Items]        
Revenues 68   82  
Gas        
Disaggregation of Revenue [Line Items]        
Revenues 255   805  
Increase (decrease) of revenue due to Tax Cuts and Jobs Act 5   (27)  
Gas | Other        
Disaggregation of Revenue [Line Items]        
Revenues 2   4  
Gas | Alternative Revenue Programs        
Disaggregation of Revenue [Line Items]        
Revenues (1)   (4)  
Gas | Other        
Disaggregation of Revenue [Line Items]        
Revenues 15   5  
Gas | Gas sales        
Disaggregation of Revenue [Line Items]        
Revenues 180   637  
Gas | End User Transportation        
Disaggregation of Revenue [Line Items]        
Revenues 49   134  
Gas | Intermediate Transportation        
Disaggregation of Revenue [Line Items]        
Revenues 11   29  
Gas Storage and Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues 122   241  
Power and Industrial Projects        
Disaggregation of Revenue [Line Items]        
Revenues 538   1,105  
Lease revenue outside scope of Topic 606 399   844  
Energy Trading        
Disaggregation of Revenue [Line Items]        
Revenues 1,164   2,662  
Gain (loss) on derivative outside scope of Topic 606 $ 937   $ 2,100