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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating activities    
Net income $ 1,357 $ 1,282
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 1,821 1,597
Nuclear fuel amortization 91 86
Deferred income taxes (85) (9)
Allowance for equity funds used during construction (53) (53)
Earnings from equity method investments (27) (47)
Dividends from equity method investments 30 31
Provision for bad debts 41 53
Share-based compensation expense 19 20
Changes in operating assets and liabilities:    
Accounts receivable (221) (152)
Accrued unbilled revenues 69 58
Inventories (272) (82)
Other current assets 13 8
Accounts payable 152 61
Net regulatory assets and liabilities 239 (997)
Other current liabilities 51 (22)
Pension and other employee benefit obligations (59) (131)
Other, net 1 (124)
Net cash provided by operating activities 3,167 1,579
Investing activities    
Capital/construction expenditures (3,325) (3,032)
Purchase of investment securities (1,055) (540)
Proceeds from the sale of investment securities 1,029 531
Other, net 30 (24)
Net cash used in investing activities (3,321) (3,065)
Financing activities    
(Repayments of) proceeds from short-term borrowings, net (847) 1,163
Proceeds from issuances of long-term debt 2,164 1,920
Repayments of long-term debt, including reacquisition premiums (600) (399)
Proceeds from issuance of common stock 156 13
Dividends paid (754) (698)
Other, net (14) (11)
Net cash provided by financing activities 105 1,988
Net change in cash, cash equivalents and restricted cash (49) 502
Cash, cash equivalents and restricted cash at beginning of period 166 129
Cash, cash equivalents and restricted cash at end of period 117 631
Supplemental disclosure of cash flow information:    
Cash paid for interest (net of amounts capitalized) (628) (592)
Cash paid for income taxes, net (16) (6)
Supplemental disclosure of non-cash investing and financing transactions:    
Accrued property, plant and equipment additions 393 476
Inventory transfers to property, plant and equipment 34 87
Operating lease right-of-use assets 17 4
Allowance for equity funds used during construction 53 53
Issuance of common stock for reinvested dividends and/or equity awards $ 40 $ 26