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Consolidated Statements of Operations and Comprehensive Income, Parent - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Income Statement [Abstract]    
Operating revenues $ 6,788 $ 6,161
Operating expenses    
Purchased power and fuel 4,384 3,417
Operating and maintenance 1,545 1,486
Depreciation and amortization 248 306
Taxes other than income taxes 160 139
Total operating expenses 6,337 5,348
Operating income (loss) 451 813
Other income and (deductions)    
Interest expense, net (146) (127)
Other, net (154) 362
Total other income and (deductions) (300) 235
Income (loss) before income taxes 151 1,048
Income tax (benefit) expense 22 165
Net income (loss) 129 883
Net income (loss) attributable to noncontrolling interests 11 0
Net income (loss) attributable to common shareholders 118 883
Comprehensive income (loss), net of income taxes    
Net income (loss) 129 883
Pension and non-pension postretirement benefit plans:    
Prior service benefit reclassified to periodic benefit cost 0 (1)
Actuarial loss reclassified to periodic cost 17 18
Pension and non-pension postretirement benefit plan valuation adjustment (34) (3)
Unrealized gain (loss) on cash flow hedges 2 0
Unrealized gain (loss) on foreign currency translation 8 (3)
Other comprehensive income (loss), net of income taxes (7) 11
Comprehensive income (loss) 122 894
Comprehensive income (loss) attributable to noncontrolling interests 11 0
Comprehensive income (loss) attributable to common shareholders $ 111 $ 894
Average shares of common stock outstanding:    
Basic (in shares) 313 317
Assumed exercise and/or distributions of stock-based awards (in shares) 1 1
Diluted (in shares) 314 318
Earnings per average common share    
Basic (in dollars per share) $ 0.38 $ 2.79
Diluted (in dollars per share) $ 0.38 $ 2.78