CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities
Net income	$ 526	$ 514
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	717	765
Nuclear fuel amortization	84	91
Deferred income taxes	16	(167)
Allowance for equity funds used during construction	(26)	(21)
Provision for bad debts	20	10
Changes in operating assets and liabilities:
Accounts receivable	(19)	(56)
Accrued unbilled revenues	117	40
Inventories	37	(107)
Other current assets	(11)	5
Accounts payable	(97)	57
Net regulatory assets and liabilities	307	325
Other current liabilities	98	88
Pension and other employee benefit obligations	(17)	(9)
Other, net	14	32
Net cash provided by operating activities	1,766	1,567
Investing activities
Capital/construction expenditures	(1,668)	(1,293)
Purchase of investment securities	(704)	(1,055)
Proceeds from the sale of investment securities	678	1,029
Investments in utility money pool arrangement	(200)	(1,426)
Repayments from utility money pool arrangement	200	1,408
Other, net	(2)	5
Net cash used in investing activities	(1,696)	(1,332)
Financing activities
Repayments of short-term borrowings, net	(207)	0
Borrowings under utility money pool arrangement	189	0
Repayments under utility money pool arrangement	(189)	0
Proceeds from issuance of long-term debt	783	489
Repayment of long-term debt	(400)	(300)
Capital contributions from parent	251	4
Dividends paid to parent	(413)	(442)
Net cash provided by (used in) financing activities	14	(249)
Net change in cash, cash equivalents and restricted cash	84	(14)
Cash, cash equivalents and restricted cash at beginning of period	65	73
Cash, cash equivalents and restricted cash at end of period	149	59
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(205)	(198)
Cash received from (paid for) income taxes, net	60	(53)
Other Noncash Investing and Financing Items [Abstract]
Accrued property, plant and equipment additions	163	162
Inventory transfers to property, plant and equipment	11	9
Allowance for equity funds used during construction	26	21
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 52	$ 1