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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating activities    
Net income $ 1,282 $ 1,185
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 1,597 1,459
Nuclear fuel amortization 86 94
Deferred income taxes (9) 45
Allowance for equity funds used during construction (53) (91)
Earnings from equity method investments (47) (29)
Dividends from equity method investments 31 32
Provision for bad debts 53 39
Share-based compensation expense 20 60
Changes in operating assets and liabilities:    
Accounts receivable (152) (108)
Accrued unbilled revenues 58 124
Inventories (82) (37)
Other current assets 8 (68)
Accounts payable 61 (97)
Net regulatory assets and liabilities (997) (139)
Other current liabilities (22) (54)
Pension and other employee benefit obligations (131) (138)
Other, net (124) (103)
Net cash provided by operating activities 1,579 2,174
Investing activities    
Capital/construction expenditures (3,032) (3,681)
Proceeds from Sales of Business, Affiliate and Productive Assets 0 684
Purchase of investment securities (540) (1,275)
Proceeds from the sale of investment securities 531 1,260
Other, net (24) (9)
Net cash used in investing activities (3,065) (3,021)
Financing activities    
Proceeds from (repayments of) short-term borrowings, net 1,163 (95)
Proceeds from issuances of long-term debt 1,920 2,940
Repayments of long-term debt, including reacquisition premiums (399) (701)
Proceeds from issuance of common stock 13 5
Dividends paid (698) (638)
Other, net (11) (27)
Net cash provided by financing activities 1,988 1,484
Net change in cash, cash equivalents and restricted cash 502 637
Cash, cash equivalents and restricted cash at beginning of period 129 248
Cash, cash equivalents and restricted cash at end of period 631 885
Supplemental disclosure of cash flow information:    
Cash paid for interest (net of amounts capitalized) (592) (582)
Cash paid for income taxes, net (6) (17)
Supplemental disclosure of non-cash investing and financing transactions:    
Accrued property, plant and equipment additions 476 933
Inventory transfers to property, plant and equipment 87 250
Operating lease right-of-use assets 4 361
Allowance for equity funds used during construction 53 91
Issuance of common stock for reinvested dividends and/or equity awards $ 26 $ 51