CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 125	$ 108	$ 107
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	159	148	158
Deferred income taxes	(2)	9	(36)
Allowance for equity funds used during construction	(7)	(5)	(5)
Provision for bad debts	4	4	7
Changes in operating assets and liabilities:
Accounts receivable	(13)	(5)	(12)
Accrued unbilled revenues	(5)	(16)	0
Inventories	(14)	(12)	(5)
Other current assets	(20)	(4)	(3)
Accounts payable	5	8	(3)
Net regulatory assets and liabilities	18	(41)	0
Other current liabilities	16	2	4
Pension and other employee benefit obligations	(4)	(9)	(7)
Other, net	(5)	(1)	(3)
Net cash provided by operating activities	257	186	202
Investing activities
Capital/construction expenditures	(353)	(264)	(238)
Investments In Utility Money Pool Arrangement	(100)	(71)	0
Repayments From Utility Money Pool Arrangement	100	71	0
Net cash used in investing activities	(353)	(264)	(238)
Financing activities
(Repayments of) proceeds from short-term borrowings, net	(35)	64	(46)
Proceeds from issuance of long-term debt	99	99	97
Repayments of long-term debt	0	(19)	0
Borrowings Under Utility Money Pool Arrangement	591	358	0
Repayments Under Utility Money Pool Arrangement	(591)	(358)	0
Capital contributions from parent	114	46	56
Dividends paid to parent	(91)	(103)	(70)
Net cash provided by financing activities	87	87	37
Net change in cash, cash equivalents and restricted cash	(9)	9	1
Cash, cash equivalents and restricted cash at beginning of period	11	2	1
Cash, cash equivalents and restricted cash at end of period	2	11	2
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(39)	(38)	(36)
Cash paid for income taxes, net	(32)	(22)	(26)
Other Noncash Investing and Financing Items [Abstract]
Supplemental disclosure of non-cash investing and financing transactions:	54	43	21
Inventory transfers to plant, property and equipment	1	1	5
Allowance for Funds Used During Construction, Investing Activities	$ 7	$ 5	$ 5