Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income	$ 109	$ 74
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	121	111
Deferred income taxes	37	4
Pension and other postretirement benefits	1	1
Allowance for equity funds used during construction	(5)	(3)
Decoupling mechanism deferrals, net of amortization	11	(3)
Other non-cash income and expenses, net	23	10
Changes in working capital:
Decrease in accounts receivable, net	(5)	34
(Increase) in inventories	(1)	0
(Increase)/decrease in margin deposits	27	86
(Decrease) in accounts payable and accrued liabilities	24	(174)
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities	0	(140)
Other working capital items, net	(16)	(27)
Other, net	(28)	(14)
Net cash provided by operating activities	175	(39)
Cash flows from investing activities:
Capital expenditures	(325)	(274)
Proceeds from Sale of Property, Plant, and Equipment	0	2
Other, net	(6)	(4)
Net cash used in investing activities	(331)	(276)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Issuance or Sale of Equity	78	300
Payments on long-term debt	0	(260)
Proceeds from Issuance of long-term debt	450	100
Issuance of commercial paper, net	(146)	68
Dividends paid	(48)	(40)
Other	(7)	(6)
Net cash provided by (used in) financing activities	327	162
Increase (Decrease) in cash and cash equivalents	171	(153)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	176	12
Supplemental cash flow information is as follows:
Cash paid for interest, net of amounts capitalized	26	22
Cash paid for income taxes, net	2	2
Increase (Decrease) in Other Regulatory Assets	(120)	(6)
Increase (Decrease) in Regulatory Liabilities	(3)	$ 8
Common Stock Including Additional Paid in Capital [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Issuance or Sale of Equity	$ 78