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Segment Information - Generation Total Revenues Net of Purchased Power and Fuel Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments $ 2,886 $ 2,477 $ 7,589 $ 6,820
Other 545 267 1,769 319
Total RNF 3,431 2,744 9,358 7,139
Mid-Atlantic        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 809 744 2,242 2,158
Midwest        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 884 778 2,352 2,441
New York        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 357 317 1,074 897
ERCOT        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 403 207 826 423
Other Power Regions         
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 433 431 1,095 901
Operating Segments        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 2,893 2,479 7,612 6,830
Operating Segments | Mid-Atlantic        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 806 747 2,235 2,202
Operating Segments | Midwest        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 881 776 2,345 2,439
Operating Segments | New York        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 361 311 1,070 851
Operating Segments | ERCOT        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 404 211 836 429
Operating Segments | Other Power Regions         
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 441 434 1,126 909
Intersegment Revenues        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments (7) (2) (23) (10)
Other (7) (2) (23) (10)
Intersegment Revenues | Mid-Atlantic        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 3 (3) 7 (44)
Intersegment Revenues | Midwest        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments 3 2 7 2
Intersegment Revenues | New York        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments (4) 6 4 46
Intersegment Revenues | ERCOT        
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments (1) (4) (10) (6)
Intersegment Revenues | Other Power Regions         
Segment Reporting Information [Line Items]        
Total RNF for Reportable Segments (8) (3) (31) (8)
Segment Reconciling Items        
Segment Reporting Information [Line Items]        
Other $ 538 $ 265 $ 1,746 $ 309