Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 305	$ 339
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	379	356
Allowance for equity funds	(19)	(30)
Deferred income taxes and amortization of investment tax credits	9	105
Changes in regulatory assets and liabilities	18	(43)
Other, net	3	11
Changes in other operating assets and liabilities:
Accounts receivable and other assets	19	45
Derivative collateral, net	(30)	12
Inventories	(5)	18
Income taxes	216	18
Accounts payable and other liabilities	92	55
Net cash flows from operating activities	987	886
Cash flows from investing activities:
Capital expenditures	(419)	(532)
Other, net	(22)	(3)
Net cash flows from investing activities	(441)	(535)
Cash flows from financing activities:
Proceeds from long-term debt	250	425
Repayments of long-term debt and capital lease obligations	(1)	(13)
Net repayments of short-term debt	(20)	0
Common stock dividends	(700)	(625)
Other, net	(2)	(3)
Net cash flows from financing activities	(473)	(216)
Net change in cash and cash equivalents	73	135
Cash and cash equivalents at beginning of period	23	53
Cash and cash equivalents at end of period	$ 96	$ 188