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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities    
Net income $ 488 $ 418
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 664 631
Nuclear fuel amortization 20 29
Deferred income taxes 154 (73)
Allowance for equity funds used during construction (37) (19)
Earnings from equity method investments (8) (11)
Dividends from equity method investments 9 9
Provision for bad debts 17 23
Share-based compensation expense 6 9
Changes in operating assets and liabilities:    
Accounts receivable 78 50
Accrued unbilled revenues 73 329
Inventories 50 189
Other current assets (65) 8
Accounts payable (114) (359)
Net regulatory assets and liabilities 81 345
Other current liabilities (180) 63
Pension and other employee benefit obligations (103) (45)
Other, net (83) (59)
Net cash provided by operating activities 1,050 1,537 Close
Investing activities    
Capital/construction expenditures (1,537) (1,265)
Purchase of investment securities (189) (236)
Proceeds from the sale of investment securities 179 228
Other, net (9) (11)
Net cash used in investing activities (1,556) (1,284) Close
Financing activities    
Repayments of short-term borrowings, net (322) 266
Proceeds from issuances of long-term debt 1,478 0
Repayments of long-term debt, including reacquisition premiums 0 (250)
Proceeds from issuance of common stock 8 6
Dividends paid (280) (259)
Other, net (6) (13)
Net cash provided by (used in) financing activities 878 (250) Close
Net change in cash, cash equivalents and restricted cash 372 3 Close
Cash, cash equivalents and restricted cash at beginning of period 129 111
Cash, cash equivalents and restricted cash at end of period 501 114
Supplemental disclosure of cash flow information:    
Cash paid for interest (net of amounts capitalized) (230) (209)
Cash received (paid) for income taxes, net; includes proceeds from tax credit transfers 131 (1)
Supplemental disclosure of non-cash investing and financing transactions:    
Accrued property, plant and equipment additions 452 449
Inventory transfers to property, plant and equipment 99 34
Operating lease right-of-use assets 0 47
Allowance for equity funds used during construction 37 19
Issuance of common stock for reinvested dividends and/or equity awards $ 15 $ 21