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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Operating activities    
Net income $ 927 $ 790
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 1,461 1,370
Nuclear fuel amortization 55 53
Deferred income taxes 282 285
Allowance for equity funds used during construction (117) (75)
Loss (earnings) from equity method investments 9 (16)
Dividends from equity method investments 16 18
Provision for bad debts 31 28
Share-based compensation expense 21 17
Changes in operating assets and liabilities:    
Accounts receivable 85 148
Accrued unbilled revenues 10 6
Inventories (97) (2)
Other current assets 89 (53)
Accounts payable (154) 4
Net regulatory assets and liabilities (50) 150
Other current liabilities (290) (439)
Pension and other employee benefit obligations (115) (98)
Other, net (54) 54
Net cash provided by operating activities 2,109 2,240
Investing activities    
Capital/construction expenditures (4,415) (3,368)
Purchase of investment securities (571) (469)
Proceeds from the sale of investment securities 570 450
Other, net (14) (16)
Net cash used in investing activities (4,430) (3,403)
Financing activities    
Proceeds from short-term borrowings, net 125 17
Proceeds from issuances of long-term debt 3,893 3,644
Repayments of long-term debt (932) (550)
Proceeds from issuance of common stock 1,143 101
Dividends paid (625) (575)
Other, net (8) (5)
Net cash provided by financing activities 3,596 2,632
Net change in cash, cash equivalents and restricted cash 1,275 1,469
Cash, cash equivalents and restricted cash at beginning of period 179 129
Cash, cash equivalents and restricted cash at end of period 1,454 1,598
Supplemental disclosure of cash flow information:    
Cash paid for interest (net of amounts capitalized) (583) (517)
Cash received for income taxes, net; includes proceeds from tax credit transfers 408 351
Supplemental disclosure of non-cash investing and financing transactions:    
Accrued property, plant and equipment additions 1,081 520
Inventory transfers to property, plant and equipment 217 164
Operating lease right-of-use assets 159 40
Allowance for equity funds used during construction 117 75
Issuance of common stock for reinvested dividends and/or equity awards $ 39 $ 35