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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities    
Net income $ 418 $ 380
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 631 567
Nuclear fuel amortization 29 30
Deferred income taxes (73) (55)
Allowance for equity funds used during construction (19) (13)
Earnings from equity method investments (11) (15)
Dividends from equity method investments 9 10
Provision for bad debts 23 17
Share-based compensation expense 9 4
Changes in operating assets and liabilities:    
Accounts receivable 50 (191)
Accrued unbilled revenues 329 146
Inventories 189 107
Other current assets 8 (10)
Accounts payable (359) (34)
Net regulatory assets and liabilities 345 215
Other current liabilities 63 51
Pension and other employee benefit obligations (45) (31)
Other, net (59) (38)
Net cash provided by operating activities 1,537 1,140
Investing activities    
Capital/construction expenditures (1,265) (942)
Purchase of investment securities (236) (156)
Proceeds from the sale of investment securities 228 147
Other, net (11) (1)
Net cash used in investing activities (1,284) (952)
Financing activities    
Proceeds from (repayments of) short-term borrowings, net 266 (9)
Repayments of long-term debt, including reacquisition premiums (250) 0
Proceeds from issuance of common stock 6 1
Dividends paid (259) (240)
Other, net (13) (16)
Net cash used in financing activities (250) (264)
Net change in cash, cash equivalents and restricted cash 3 (76)
Cash, cash equivalents and restricted cash at beginning of period 111 166
Cash, cash equivalents and restricted cash at end of period 114 90
Supplemental disclosure of cash flow information:    
Cash paid for interest (net of amounts capitalized) (209) (202)
Cash paid for income taxes, net (1) 0
Supplemental disclosure of non-cash investing and financing transactions:    
Accrued property, plant and equipment additions 449 288
Inventory transfers to property, plant and equipment 34 20
Operating lease right-of-use assets 47 8
Allowance for equity funds used during construction 19 13
Issuance of common stock for reinvested dividends and/or equity awards $ 21 $ 11