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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Operating Revenues $ (3,229) $ (2,583) $ (7,007) $ (5,605)
Electric        
Segment Reporting Information [Line Items]        
Operating Revenues (1,411) (1,312) (2,775) (2,528)
Gas        
Segment Reporting Information [Line Items]        
Operating Revenues (265) (251) (877) (791)
Gas Storage and Pipelines        
Segment Reporting Information [Line Items]        
Operating Revenues (208) (172) (405) (342)
Power and Industrial Projects        
Segment Reporting Information [Line Items]        
Operating Revenues (394) (219) (760) (526)
Energy Trading        
Segment Reporting Information [Line Items]        
Operating Revenues (1,167) (740) (2,606) (1,653)
Reconciliation and Eliminations        
Segment Reporting Information [Line Items]        
Operating Revenues 216 112 417 236
Reconciliation and Eliminations | Electric        
Segment Reporting Information [Line Items]        
Operating Revenues 15 15 31 30
Reconciliation and Eliminations | Gas        
Segment Reporting Information [Line Items]        
Operating Revenues 3 4 7 8
Reconciliation and Eliminations | Gas Storage and Pipelines        
Segment Reporting Information [Line Items]        
Operating Revenues 9 5 14 9
Reconciliation and Eliminations | Power and Industrial Projects        
Segment Reporting Information [Line Items]        
Operating Revenues 176 80 338 174
Reconciliation and Eliminations | Energy Trading        
Segment Reporting Information [Line Items]        
Operating Revenues 13 8 26 14
Reconciliation and Eliminations | Corporate and Other        
Segment Reporting Information [Line Items]        
Operating Revenues $ 0 $ 0 $ 1 $ 1