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Segment Information - Generation Total Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Revenues from contracts with customers $ 6,106 $ 5,260
Other revenues 682 901
Total Operating revenues 6,788 6,161
Total Purchased power and fuel expenses (4,384) (3,417)
Total RNF 2,404 2,744
Operating Segments    
Segment Reporting Information [Line Items]    
Revenues from contracts with customers 5,269 4,522
Other revenues 316 272
Total Operating revenues 5,585 4,794
Total Purchased power and fuel expenses (3,117) (2,496)
Total RNF 2,468 2,298
Operating Segments | Mid-Atlantic    
Segment Reporting Information [Line Items]    
Revenues from contracts with customers 1,606 1,356
Other revenues 59 (114)
Total Operating revenues 1,665 1,242
Total Purchased power and fuel expenses (856) (568)
Total RNF 809 674
Operating Segments | Midwest    
Segment Reporting Information [Line Items]    
Revenues from contracts with customers 1,310 1,000
Other revenues 94 94
Total Operating revenues 1,404 1,094
Total Purchased power and fuel expenses (554) (391)
Total RNF 850 703
Operating Segments | New York    
Segment Reporting Information [Line Items]    
Revenues from contracts with customers 675 492
Other revenues (113) 21
Total Operating revenues 562 513
Total Purchased power and fuel expenses (161) (169)
Total RNF 401 344
Operating Segments | ERCOT    
Segment Reporting Information [Line Items]    
Revenues from contracts with customers 301 237
Other revenues 97 84
Total Operating revenues 398 321
Total Purchased power and fuel expenses (184) (112)
Total RNF 214 209
Operating Segments | Other Power Regions    
Segment Reporting Information [Line Items]    
Revenues from contracts with customers 1,377 1,437
Other revenues 179 187
Total Operating revenues 1,556 1,624
Total Purchased power and fuel expenses (1,362) (1,256)
Total RNF 194 368
Segment Reconciling Items    
Segment Reporting Information [Line Items]    
Revenues from contracts with customers 837 738
Other revenues 366 629
Total Operating revenues 1,203 1,367
Total Purchased power and fuel expenses (1,267) (921)
Total RNF (64) 446
Unrealized mark-to-market gains (losses) 711 608
Segment Reconciling Items | Product and Service, Other    
Segment Reporting Information [Line Items]    
Unrealized mark-to-market gains (losses) $ (287) $ 64