Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net income	$ 381	$ 432
Adjustments to reconcile net income to cash from operating activities:
Depreciation and amortization	316	322
Deferred income taxes and investment tax credits	(18)	105
Allowance for equity funds used during construction	(13)	(25)
Deferred recovery clauses	312	(327)
Regulatory assets and liabilities	75	(56)
Pension and post-retirement asset and liabilities	(20)	(16)
Other	15	(4)
Increase (Decrease) in Operating Capital [Abstract]
Receivables, less allowance for credit losses	(132)	(104)
Inventories	(47)	(23)
Taxes accrued	81	64
Interest accrued	22	29
Accounts payable	(51)	77
Other	(10)	(10)
Cash flows from operating activities	911	464
Cash flows used in investing activities
Capital expenditures	(889)	(979)
Net proceeds from sale of assets	0	10
Cash flows used in investing activities	(889)	(969)
Cash flows from financing activities
Equity contributions from Parent	300	470
Proceeds from long-term debt issuance	0	595
Repayment of long-term debt	0	(250)
Net increase in short-term debt (maturities of 90 days or less)	139	105
Advances to affiliate	(160)	0
Dividends to Parent	(302)	(348)
Other	(1)	0
Cash flows from (used in) financing activities	(24)	572
Net increase (decrease) in cash and cash equivalents	(2)	67
Cash and cash equivalents at beginning of period (refer to Note 1)	10	18
Cash and cash equivalents at end of period	8	85
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	(19)	(20)
Change in notes receivable from PGS	$ (736)	$ 0