Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from or used in operating activities
Net income	$ 468	$ 466	$ 540
Adjustments to reconcile net income to cash from operating activities:
Depreciation and amortization	454	422	436
Deferred income taxes and investment tax credits	66	(22)	137
Allowance for equity funds used during construction	(30)	(19)	(35)
Deferred recovery clauses	134	415	(422)
Regulatory assets and liabilities	(305)	116	(100)
Pension and post-retirement asset and liabilities	(11)	(23)	(18)
Other	15	14	(1)
Changes in working capital:
Receivables, less allowance for credit losses	72	(44)	(45)
Inventories	(19)	(39)	(41)
Taxes accrued	(3)	12	(23)
Accounts payable	315	(56)	75
Other	8	(1)	8
Cash flows from operating activities	1,164	1,241	511
Cash flows from or used in investing activities
Capital expenditures	(1,422)	(1,294)	(1,427)
Net proceeds from sale of assets	3	0	10
Cash flows used in investing activities	(1,419)	(1,294)	(1,417)
Cash flows from or used in financing activities
Equity contributions from Parent	600	300	605
Dividends to Parent	(469)	(472)	(517)
Proceeds from long-term debt issuance	495	0	595
Repayment of long-term debt	(300)	0	(250)
Advances to affiliate	0	(227)	0
Repayment of advances to affiliate	0	956	0
Advances from Parent	0	0	195
Repayment of advances from Parent	0	(195)	0
Net change in short-term debt (maturities of 90 days or less)	(70)	87	374
Proceeds from other short-term debt (maturities over 90 days)	0	400	400
Repayment of other short-term debt (maturities over 90 days)	0	(800)	(500)
Other financing activities	(2)	(1)	0
Cash flows from financing activities	254	48	902
Net increase (decrease) in cash and cash equivalents	(1)	(5)	(4)
Cash and cash equivalents at beginning of the year	5	10	18
Cash and cash equivalents at end of the year	4	5	10
Cash and cash equivalents at end of the year			14
Supplemental disclosure of cash paid (received):
Interest	182	233	152
Income taxes	(3)	102	2
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	10	20	(6)
Reclassification of short-term debt to long-term debt	0	497	0
Change in note receivable from PGS	$ 0	$ (736)	$ 0