Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 550	$ 578
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	567	541
Allowance for equity funds	(26)	(40)
Deferred income taxes and amortization of investment tax credits	32	145
Changes in regulatory assets and liabilities	41	(34)
Other, net	7	18
Changes in other operating assets and liabilities:
Accounts receivable and other assets	14	22
Derivative collateral, net	(42)	4
Inventories	(3)	29
Income taxes	250	5
Accounts payable and other liabilities	121	89
Net cash flows from operating activities	1,511	1,357
Cash flows from investing activities:
Capital expenditures	(640)	(777)
Other, net	(8)	0
Net cash flows from investing activities	(648)	(777)
Cash flows from financing activities:
Proceeds from long-term debt	250	425
Repayments of long-term debt and capital lease obligations	(116)	(213)
Net repayments of short-term debt	(20)	0
Common stock dividends	(950)	(725)
Other, net	(3)	(4)
Net cash flows from financing activities	(839)	(517)
Net change in cash and cash equivalents	24	63
Cash and cash equivalents at beginning of period	23	53
Cash and cash equivalents at end of period	$ 47	$ 116