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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating activities    
Net income $ 483 $ 488
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 734 664
Nuclear fuel amortization 29 20
Deferred income taxes 13 154
Allowance for equity funds used during construction (48) (37)
Loss (earnings) from equity method investments 1 (8)
Dividends from equity method investments 8 9
Provision for bad debts 19 17
Share-based compensation expense 9 6
Changes in operating assets and liabilities:    
Accounts receivable (58) 78
Accrued unbilled revenues 63 73
Inventories (4) 50
Other current assets (18) (65)
Accounts payable (105) (114)
Net regulatory assets and liabilities 25 81
Other current liabilities 29 (180)
Pension and other employee benefit obligations (124) (103)
Other, net (28) (83)
Net cash provided by operating activities 1,028 1,050
Investing activities    
Capital/construction expenditures (1,988) (1,537)
Purchase of investment securities (241) (189)
Proceeds from the sale of investment securities 240 179
Other, net (2) (9)
Net cash used in investing activities (1,991) (1,556)
Financing activities    
Proceeds from (repayments of) short-term borrowings, net 24 (322)
Proceeds from issuances of long-term debt 2,077 1,478
Proceeds from issuance of common stock 122 8
Dividends paid (306) (280)
Other, net (10) (6)
Net cash provided by financing activities 1,907 878
Net change in cash, cash equivalents and restricted cash 944 372
Cash, cash equivalents and restricted cash at beginning of period 179 129
Cash, cash equivalents and restricted cash at end of period 1,123 501
Supplemental disclosure of cash flow information:    
Cash paid for interest (net of amounts capitalized) (252) (230)
Cash received for income taxes, net; includes proceeds from tax credit transfers 64 131
Supplemental disclosure of non-cash investing and financing transactions:    
Accrued property, plant and equipment additions 891 452
Inventory transfers to property, plant and equipment 61 99
Operating lease right-of-use assets 55 0
Allowance for equity funds used during construction 48 37
Issuance of common stock for reinvested dividends and/or equity awards $ 18 $ 15