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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Operating activities    
Net income $ 1,472 $ 1,362
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 2,055 1,824
Nuclear fuel amortization 85 84
Deferred income taxes 406 (173)
Allowance for equity funds used during construction (119) (63)
Earnings from equity method investments (19) (27)
Dividends from equity method investments 26 26
Provision for bad debts 47 58
Share-based compensation expense 27 17
Changes in operating assets and liabilities:    
Accounts receivable 81 95
Accrued unbilled revenues 62 375
Inventories (71) 73
Other current assets 13 104
Accounts payable (42) (226)
Net regulatory assets and liabilities 282 771
Other current liabilities (238) 183
Pension and other employee benefit obligations (94) (35)
Other, net 4 (95)
Net cash provided by operating activities 3,977 4,353
Investing activities    
Capital/construction expenditures (5,147) (4,240)
Purchase of investment securities (693) (704)
Proceeds from the sale of investment securities 666 678
Other, net (23) (26)
Net cash used in investing activities (5,197) (4,292)
Financing activities    
Repayments of short-term borrowings, net (690) (813)
Proceeds from issuances of long-term debt 3,643 2,631
Repayments of long-term debt (550) (651)
Proceeds from issuance of common stock 1,109 83
Dividends paid (871) (814)
Other, net (5) (14)
Net cash provided by financing activities 2,636 422
Net change in cash, cash equivalents and restricted cash 1,416 483
Cash, cash equivalents and restricted cash at beginning of period 129 111
Cash, cash equivalents and restricted cash at end of period 1,545 594
Supplemental disclosure of cash flow information:    
Cash paid for interest (net of amounts capitalized) (793) (652)
Cash received (paid) for income taxes, net; includes proceeds from tax credit transfers 484 (68)
Supplemental disclosure of non-cash investing and financing transactions:    
Accrued property, plant and equipment additions 741 409
Inventory transfers to property, plant and equipment 217 42
Operating lease right-of-use assets 43 73
Allowance for equity funds used during construction 119 63
Issuance of common stock for reinvested dividends and/or equity awards $ 53 $ 46