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Consolidated Statements of Operations - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Statement [Abstract]      
Operating revenues $ 5,140 $ 4,684 $ 4,234
Operating expenses:      
Operation and maintenance 2,019 1,858 1,720
Depreciation and amortization 894 788 704
General taxes 348 320 307
Other 0 0 (1)
Total operating expenses, net 3,261 2,966 2,730
Operating income 1,879 1,718 1,504
Other income (expense):      
Interest expense (615) (523) (460)
Interest income 90 94 73
Non-operating benefit costs, net 16 28 32
Other, net 52 42 47
Total other income (expense) (457) (359) (308)
Income before income taxes 1,422 1,359 1,196
Provision for income taxes 311 308 252
Net income attributable to common shareholders $ 1,111 $ 1,051 $ 944
Basic earnings per share:      
Net income attributable to common shareholders (in dollars per share) [1] $ 5.69 $ 5.39 $ 4.90
Diluted earnings per share:      
Net income attributable to common shareholders (in dollars per share) [1] $ 5.69 $ 5.39 $ 4.90
Weighted average common shares outstanding:      
Basic (in shares) 195 195 193
Diluted (in shares) 195 195 193
[1] Amounts may not calculate due to rounding.