Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 64	$ 73
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	92	84
Deferred income taxes	6	17
Pension and other postretirement benefits	6	6
Allowance for equity funds used during construction	(4)	(2)
Decoupling mechanism deferrals, net of amortization	3	(9)
Deferral of net benefits due to Tax Reform	15	0
Other non-cash income and expenses, net	4	7
Changes in working capital:
Decrease in accounts receivable and unbilled revenues	45	29
Decrease in inventories	(2)	5
(Increase) in margin deposits, net	(6)	(12)
(Decrease) in accounts payable and accrued liabilities	(17)	(10)
Other working capital items, net	(5)	(13)
Other, net	(7)	(5)
Net cash provided by operating activities	194	170
Cash flows from investing activities:
Capital expenditures	(131)	(114)
Sales of Nuclear decommissioning trust securities	3	7
Purchases of Nuclear decommissioning trust securities	(3)	(5)
Other, net	1	(1)
Net cash used in investing activities	(130)	(113)
Cash flows from financing activities:
Dividends paid	(30)	(28)
Other	(3)	(4)
Net cash used in financing activities	(33)	(32)
Increase in cash and cash equivalents	31	25
Cash and cash equivalents, beginning of period	39	6
Cash and cash equivalents, end of period	70	31
Supplemental cash flow information is as follows:
Cash paid for interest, net of amounts capitalized	13	13
Cash paid for income taxes	$ 0	$ 0