CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 727	$ 660	$ 588
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	854	754	656
Deferred income taxes	(10)	21	2
Allowance for equity funds used during construction	(32)	(28)	(35)
Provision for bad debts	38	26	24
Changes in operating assets and liabilities:
Accounts receivable	(227)	(58)	(51)
Accrued unbilled revenues	(169)	(52)	(5)
Inventories	(86)	(71)	(27)
Other current assets	12	(23)	(8)
Accounts payable	183	66	(14)
Net regulatory assets and liabilities	82	(526)	58
Other current liabilities	8	30	45
Pension and other employee benefit obligations	(13)	(53)	(41)
Other, net	(112)	(19)	(18)
Net cash provided by operating activities	1,255	727	1,174
Investing activities
Utility capital/construction expenditures	(1,880)	(1,604)	(1,671)
Investments in utility money pool arrangement	(45)	(273)	(122)
Repayments from utility money pool arrangement	45	273	122
Net cash used in investing activities	(1,880)	(1,604)	(1,671)
Financing activities
Proceeds from short-term borrowings, net	146	11	136
Borrowings under utility money pool arrangement	1,199	743	1,189
Repayments under utility money pool arrangement	(1,199)	(800)	(1,171)
Proceeds from issuance of long-term debt	686	737	735
Repayments of long-term debt	(300)	0	(400)
Capital contributions from parent	569	650	856
Dividends paid to parent	(491)	(467)	(831)
Net cash provided by financing activities	610	874	514
Net change in cash and cash equivalents	(15)	(3)	17
Cash, cash equivalents and restricted cash at beginning of period	25	28	11
Cash, cash equivalents and restricted cash at end of period	10	25	28
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(250)	(230)	(211)
Cash paid for income taxes, net	(79)	(14)	(23)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	233	157	197
Inventory transfers to property, plant and equipment	12	10	35
Operating lease right-of-use assets	140	0	14
Allowance for equity funds used during construction	32	28	35
Net income	727	660	588
Depreciation, Amortization and Accretion, Net	854	754	656
Deferred Income Tax Expense (Benefit)	(10)	21	2
Allowance for funds used during construction — equity	32	28	35
Provision for bad debts	38	26	24
Increase (Decrease) in Accounts and Other Receivables	227	58	51
Increase (Decrease) in Accrued Unbilled Revenues	169	52	5
Increase (Decrease) in Inventories	86	71	27
Increase (Decrease) in Prepaid Expense and Other Assets	(12)	23	8
Increase (Decrease) in Accounts Payable	183	66	(14)
Increase (Decrease) in Regulatory Assets and Liabilities	(82)	526	(58)
Increase (Decrease) in Other Current Liabilities	8	30	45
Increase (Decrease) in Employee Related Liabilities	(13)	(53)	(41)
Other, net	(112)	(19)	(18)
Net Cash Provided by (Used in) Operating Activities	1,255	727	1,174
Payments to Acquire Productive Assets	1,880	1,604	1,671
Investments In Utility Money Pool Arrangement	45	273	122
Repayments From Utility Money Pool Arrangement	45	273	122
Net Cash Provided by (Used in) Investing Activities	(1,880)	(1,604)	(1,671)
Proceeds from short-term borrowings, net	146	11	136
Borrowings Under Utility Money Pool Arrangement	1,199	743	1,189
Repayments Under Utility Money Pool Arrangement	1,199	800	1,171
Proceeds from issuance of long-term debt	686	737	735
Repayments of Long-term Debt	300	0	400
Capital contributions from parent	569	650	856
Payments of Ordinary Dividends, Common Stock	491	467	831
Net Cash Provided by (Used in) Financing Activities	610	874	514
Net change in cash and cash equivalents	(15)	(3)	17
Cash, cash equivalents and restricted cash at end of period	10	25	28
Interest Paid, Excluding Capitalized Interest, Operating Activities	250	230	211
Income Taxes Paid, Net	79	14	23
Accrued property, plant and equipment additions	233	157	197
Inventory transfers to property, plant and equipment	12	10	35
Operating lease right-of-use assets	140	0	14
Allowance for equity funds used during construction	$ 32	$ 28	$ 35