Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 22	$ 22
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	26	25
Deferred income taxes and amortization of investment tax credits	12	12
Allowance for equity funds	(1)	(1)
Amortization of deferred energy	1	(25)
Deferred energy	(22)	(8)
Amortization of other regulatory assets	12	19
Other, net	5	5
Changes in other operating assets and liabilities:
Accounts receivable and other assets	19	10
Inventories	(5)	8
Accounts payable and other liabilities	(1)	(11)
Net cash flows from operating activities	68	56
Cash flows from investing activities:
Capital expenditures	(55)	(39)
Contributions in aid of construction and customer advances	2	7
Net cash flows from investing activities	(53)	(32)
Net change in cash and cash equivalents	15	24
Cash and cash equivalents at beginning of period	67	61
Cash and cash equivalents at end of period	$ 82	$ 85