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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 1,111 $ 1,051 $ 944
Adjustments to reconcile to net cash flows provided by operating activities:      
Depreciation and amortization 894 788 704
Deferred income taxes and amortization of investment tax credits 135 156 208
Provision for losses on accounts receivable 48 31 24
Pension and non-pension postretirement benefits 1 (3) (6)
Other non-cash, net (30) 34 (27)
Changes in assets and liabilities:      
Receivables and unbilled revenues (145) (107) (56)
Income tax receivable 16 61 28
Pension and non-pension postretirement benefit contributions (49) (52) (49)
Accounts payable and accrued liabilities 97 111 70
Accrued taxes (30) 92 21
Other assets and liabilities, net 11 (117) 13
Net cash provided by operating activities 2,059 2,045 1,874
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (3,126) (2,856) (2,575)
Acquisitions, net of cash acquired (71) (417) (81)
Removal costs from property, plant and equipment retirements, net (175) (152) (159)
Purchases of available-for-sale fixed-income securities (46) (135) 0
Proceeds from sales and maturities of available-for-sale fixed-income securities 109 181 0
Net cash used in investing activities (3,309) (3,379) (2,815)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from long-term debt, net of discount 1,781 1,437 1,264
Repayments of long-term debt (664) (475) (282)
Net proceeds from common stock financing 0 0 1,688
Net short-term borrowings (repayments) with maturities less than three months 709 700 (996)
Advances and contributions in aid of construction, net of refunds of $31, $33 and $25 in 2025, 2024 and 2023, respectively 67 39 60
Debt issuance costs (17) (14) (16)
Dividends paid (633) (585) (532)
Other, net 6 8 2
Net cash provided by financing activities 1,249 1,110 1,188
Net (decrease) increase in cash, cash equivalents and restricted funds (1) (224) 247
Cash, cash equivalents and restricted funds at beginning of period 140 364 117
Cash, cash equivalents and restricted funds at end of period 139 140 364
Cash paid during the year for:      
Interest, net of capitalized amount 568 483 445
Non-cash investing and financing activity      
Capital expenditures acquired on account but unpaid as of year end 350 347 399
Acquisition financed by treasury stock 11 0 0
Settlements of long-term debt $ 27 $ 0 $ 0