Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities
Net Income	$ 342	$ 305
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	527	482
Deferred income taxes	123	81
Asset (gains), losses and reserves and impairments, net	0	(7)
Changes in assets and liabilities, exclusive of changes shown separately (Note 15)	275	300
Net cash from operating activities	1,267	1,161
Investing Activities
Plant and equipment expenditures — utility	(708)	(708)
Plant and equipment expenditures — non-utility	(197)	(131)
Proceeds from sale of assets	15	15
Restricted cash for debt redemption, principally Securitization	10	15
Proceeds from sale of nuclear decommissioning trust fund assets	27	36
Investment in nuclear decommissioning trust funds	(35)	(44)
Other	(23)	(15)
Net cash used for investing activities	(911)	(832)
Financing Activities
Issuance of long-term debt, net	371	496
Redemption of long-term debt	(515)	(140)
Short-term borrowings, net	(24)	(380)
Issuance of common stock	19	20
Dividends on common stock	(215)	(199)
Other	(11)	(9)
Net cash used for financing activities	(375)	(212)
Net Increase (Decrease) in Cash and Cash Equivalents	(19)	117
Cash and Cash Equivalents at Beginning of Period	65	68
Cash and Cash Equivalents at End of Period	$ 46	$ 185