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Segment and Related Information (Financial Data - Inter-segment Billing) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Revenues $ (2,855) $ (2,262) $ (6,091) $ (4,828)
Reconciliation and Eliminations        
Segment Reporting Information [Line Items]        
Revenues 194 174 396 343
Reconciliation and Eliminations | Electric        
Segment Reporting Information [Line Items]        
Revenues 13 8 25 17
Reconciliation and Eliminations | Gas        
Segment Reporting Information [Line Items]        
Revenues 2 3 5 3
Reconciliation and Eliminations | Gas Storage and Pipelines        
Segment Reporting Information [Line Items]        
Revenues 15 3 22 5
Reconciliation and Eliminations | Power and Industrial Projects        
Segment Reporting Information [Line Items]        
Revenues 156 150 324 298
Reconciliation and Eliminations | Energy Trading        
Segment Reporting Information [Line Items]        
Revenues 8 8 19 18
Reconciliation and Eliminations | Corporate and Other        
Segment Reporting Information [Line Items]        
Revenues $ 0 $ 2 $ 1 $ 2