Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating Activities
Net Income	$ 542	$ 535
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	811	747
Nuclear fuel amortization	25	25
Allowance for equity funds used during construction	(10)	(10)
Deferred income taxes	162	96
Asset (gains) and losses, reserves and impairments, net	5	7
Changes in assets and liabilities:
Accounts receivable, net	177	237
Inventories	35	5
Accounts payable	(16)	(35)
Derivative assets and liabilities	(23)	38
Accrued pension obligation	(44)	(3)
Accrued postretirement obligation	(191)	(143)
Regulatory assets and liabilities	327	286
Other assets	(62)	(2)
Other liabilities	(13)	(40)
Net cash from operating activities	1,715	1,729
Investing Activities
Plant and equipment expenditures — utility	(1,101)	(1,008)
Plant and equipment expenditures — non-utility	(270)	(214)
Proceeds from sale of assets	20	20
Restricted cash for debt redemption, principally Securitization	58	55
Proceeds from sale of nuclear decommissioning trust fund assets	40	48
Investment in nuclear decommissioning trust funds	(52)	(61)
Other	(32)	(24)
Net cash used for investing activities	(1,337)	(1,184)
Financing Activities
Issuance of long-term debt, net	768	495
Redemption of long-term debt	(855)	(447)
Short-term borrowings, net	31	(321)
Issuance of common stock	29	29
Dividends on common stock	(329)	(300)
Other	(16)	(10)
Net cash used for financing activities	(372)	(554)
Net Increase (Decrease) in Cash and Cash Equivalents	6	(9)
Cash and Cash Equivalents at Beginning of Period	65	68
Cash and Cash Equivalents at End of Period	71	59
Supplemental Disclosure of Non-Cash Information
Common stock issued for employee benefit and compensation plans	279	143
Change in capital expenditures not paid	$ 263	$ 184