Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 228	$ 233	$ 244
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	458	417	404
Deferred income taxes	8	6	5
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(19)	(14)	(17)
Pension and other postretirement benefits	5	13	24
Decoupling mechanism deferrals, net of amortization	(11)	(11)	29
Share-based Payment Arrangement, Noncash Expense	17	15	14
Increase (Decrease) in Other Regulatory Assets	20	(46)	(158)
Increase (Decrease) in Regulatory Liabilities	24	5	7
Other Operating Activities, Cash Flow Statement	24	0	0
Other non-cash income and expenses, net	40	40	23
Changes in working capital:
Decrease (increase) in receivables and unbilled revenues	(29)	(66)	(64)
(Increase) in margin deposits	24	(80)	(29)
(Decrease) increase in payables and accrued liabilities	(166)	157	61
Increase (Decrease) in Contract with Customer, Asset	(135)	82	58
Other working capital items, net	(20)	(22)	(21)
Contribution to non-qualified employee benefit trust	(7)	(9)	(11)
Asset Retirement Obligation, Cash Paid to Settle	(25)	(27)	(18)
Other, net	(16)	(19)	(19)
Net cash provided by operating activities	420	674	532
Cash flows from investing activities:
Capital expenditures	(1,358)	(766)	(636)
Purchases of nuclear decommissioning trust securities	(1)	(3)	(10)
Sales of nuclear decommissioning trust securities	1	3	12
Other, net	0	8	(22)
Net cash used in investing activities	(1,358)	(758)	(656)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	600	360	400
Payments on long-term debt	(260)	0	(160)
Proceeds from Issuance or Sale of Equity	485	0	0
Proceeds from Short-term Debt	0	0	200
Repayments of Short-term Debt	0	0	(350)
Proceeds from (Repayments of) Commercial Paper	146
Proceeds from Issuance of Commercial Paper		0	0
Proceeds from Other Debt	0	25	0
Dividends paid	(179)	(158)	(150)
Payments for Repurchase of Common Stock	0	(18)	(12)
Other	(14)	(12)	(9)
Net cash used in financing activities	778	197	(81)
(Decrease) increase in cash and cash equivalents	(160)	113	(205)
Cash and cash equivalents, beginning of year	165	52	257
Cash and cash equivalents, end of year	5	165	52
Supplemental disclosures of cash flow information:
Cash paid for interest, net of amounts capitalized	136	128	120
Cash paid for income taxes	12	37	16
Non-cash investing and financing activities:
Accrued capital additions	212	111	87
Accrued dividends payable	$ 51	$ 42	$ 40