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Consolidated Statements of Operations and Comprehensive Income, Parent - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Income Statement [Abstract]        
Operating revenues $ 6,550 $ 6,111 $ 18,186 $ 19,122
Operating expenses        
Purchased power and fuel 3,119 3,367 8,828 11,983
Operating and maintenance 1,535 1,353 4,666 4,263
Depreciation and amortization 266 266 868 808
Taxes other than income taxes 165 148 446 419
Total operating expenses 5,085 5,134 14,808 17,473
Gain (loss) on sales of assets and businesses 2 0 2 28
Operating income (loss) 1,467 977 3,380 1,677
Other income and (deductions)        
Interest expense, net (147) (82) (416) (292)
Other, net 325 0 693 919
Total other income and (deductions) 178 (82) 277 627
Income (loss) before income taxes 1,645 895 3,657 2,304
Income tax (benefit) expense 449 205 768 677
Equity in income (losses) of unconsolidated affiliates 0 0 (1) (11)
Net income (loss) 1,196 690 2,888 1,616
Net income (loss) attributable to noncontrolling interests (4) (41) (9) (44)
Net income (loss) attributable to common shareholders 1,200 731 2,897 1,660
Comprehensive income (loss), net of income taxes        
Net income (loss) 1,196 690 2,888 1,616
Pension and non-pension postretirement benefit plans:        
Prior service benefit reclassified to periodic benefit cost (1) 0 (3) (3)
Actuarial loss reclassified to periodic cost 15 5 53 18
Pension and non-pension postretirement benefit plan valuation adjustment 0 0 (4) (53)
Unrealized gain (loss) on cash flow hedges 1 0 3 0
Unrealized gain (loss) on foreign currency translation 12 (2) 8 1
Other comprehensive income (loss), net of income taxes 27 3 57 (37)
Comprehensive income (loss) 1,223 693 2,945 1,579
Comprehensive income (loss) attributable to noncontrolling interests (4) (41) (9) (44)
Comprehensive income (loss) attributable to common shareholders $ 1,227 $ 734 $ 2,954 $ 1,623
Average shares of common stock outstanding:        
Basic (in shares) 313 322 315 324
Assumed exercise and/or distributions of stock-based awards (in shares) 1 1 1 1
Diluted (in shares) 314 323 316 325
Earnings per average common share        
Basic (in dollars per share) $ 3.83 $ 2.27 $ 9.20 $ 5.12
Diluted (in dollars per share) $ 3.82 $ 2.26 $ 9.17 $ 5.11