CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities
Net income	$ 245	$ 241
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	507	453
Nuclear fuel amortization	61	56
Deferred income taxes	(144)	(30)
Allowance for equity funds used during construction	(12)	(14)
Provision for bad debts	9	12
Changes in operating assets and liabilities:
Accounts receivable	(16)	(62)
Accrued unbilled revenues	13	(22)
Inventories	(28)	16
Other current assets	1	10
Accounts payable	50	5
Net regulatory assets and liabilities	258	(105)
Other current liabilities	12	(45)
Pension and other employee benefit obligations	(7)	(35)
Other, net	20	(24)
Net cash provided by operating activities	969	456
Investing activities
Capital/construction expenditures	(752)	(842)
Purchase of investment securities	(787)	(628)
Proceeds from the sale of investment securities	769	410
Investments in utility money pool arrangement	(856)	(189)
Repayments from utility money pool arrangement	855	93
Other, net	2	(3)
Net cash used in investing activities	(769)	(1,159)
Financing activities
Repayments of short-term borrowings, net	0	(179)
Borrowings under utility money pool arrangement	0	434
Repayments under utility money pool arrangement	0	(434)
Proceeds from issuance of long-term debt	489	836
Repayment of long-term debt	(300)	0
Capital contributions (to) from parent	(7)	624
Dividends paid to parent	(263)	(216)
Other, net	0	2
Net cash (used in) provided by financing activities	(81)	1,067
Net change in cash, cash equivalents and restricted cash	119	364
Cash, cash equivalents and restricted cash at beginning of period	73	46
Cash, cash equivalents and restricted cash at end of period	192	410
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(129)	(116)
Cash (paid) received for income taxes, net	(25)	4
Other Noncash Investing and Financing Items [Abstract]
Accrued property, plant and equipment additions	148	305
Inventory transfers to property, plant and equipment	9	6
Allowance for equity funds used during construction	$ 12	$ 14