Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net income	$ 79	$ 118
Adjustments to reconcile net income to cash from operating activities:
Depreciation and amortization	104	105
Deferred income taxes and investment tax credits	14	39
Allowance for equity funds used during construction	(3)	(8)
Deferred recovery clauses	50	(49)
Regulatory assets and liabilities	11	5
Increase (Decrease) in Operating Capital [Abstract]
Receivables, less allowance for credit losses	(2)	(5)
Inventories	(10)	(8)
Taxes accrued	19	11
Interest accrued	8	21
Accounts payable	(125)	(84)
Other	6	(3)
Cash flows from operating activities	151	142
Cash flows used in investing activities
Capital expenditures	(254)	(301)
Net proceeds from sale of assets	0	3
Cash flows used in investing activities	(254)	(298)
Cash flows from financing activities
Equity contributions from Parent	100	175
Net increase in short-term debt (maturities of 90 days or less)	164	68
Advances to affiliate	(76)	0
Dividends to Parent	(91)	(85)
Cash flows from financing activities	97	158
Net increase (decrease) in cash and cash equivalents	(6)	2
Cash and cash equivalents at beginning of period (refer to Note 1)	10	18
Cash and cash equivalents at end of period	4	20
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	(9)	(20)
Change in notes receivable from PGS	$ 736	$ 0