Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Deferred Liabilities	$ (12)	$ (5)	$ (2)
Cash flows from operating activities:
Net income	212	187	193
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	382	345	321
Deferred income taxes	(17)	70	37
Allowance for equity funds used during construction	(11)	(12)	(21)
Pension and Other Postretirement Benefits	30	24	28
Decoupling mechanism deferrals, net of amortization	(2)	(22)	(6)
Tax Adjustments, Settlements, and Unusual Provisions	45	0	0
Other non-cash income and expenses, net	21	31	12
Changes in working capital:
(Increase) in receivables and unbilled revenues	(29)	(3)	(9)
(Increase) decrease in margin deposits	(5)	(3)	25
Increase in payables and accrued liabilities	51	5	15
Other working capital items, net	(11)	1	(4)
Contribution to non-qualified employee benefit trust	(11)	(8)	(10)
Other, net	(13)	(13)	(17)
Net cash provided by operating activities	630	597	562
Cash flows from investing activities:
Capital expenditures	(595)	(514)	(584)
Purchases of nuclear decommissioning trust securities	(12)	(18)	(25)
Sales of nuclear decommissioning trust securities	15	21	27
Proceeds from Carty Settlement	120	0	0
Other, net	1	(3)	(3)
Net cash used in investing activities	(471)	(514)	(585)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	75	225	290
Payments on long-term debt	(24)	(150)	(133)
(Maturities) issuances of commercial paper, net	0	0	(6)
Dividends paid	(125)	(118)	(110)
Other	(5)	(7)	(16)
Net cash (used in) provided by financing activities	(79)	(50)	25
Increase (decrease) in cash and cash equivalents	80	33	2
Cash and cash equivalents, beginning of year	39	6	4
Cash and cash equivalents, end of year	119	39	6
Supplemental disclosures of cash flow information:
Cash paid for interest, net of amounts capitalized	117	110	104
Cash paid for income taxes	25	18	16
Non-cash investing and financing activities:
Accrued capital additions	61	53	50
Accrued dividends payable	34	31	30
Assets obtained under leasing arrangements	$ 24	$ 87	$ 78