Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating Activities
Net Income	$ 535	$ 563
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	747	752
Deferred income taxes	96	123
Asset (gains), losses and reserves and impairments, net	(7)	0
Changes in assets and liabilities, exclusive of changes shown separately (Note 14)	358	48
Net cash from operating activities	1,729	1,486
Investing Activities
Plant and equipment expenditures — utility	(1,008)	(968)
Plant and equipment expenditures — non-utility	(214)	(61)
Proceeds from sale of assets	20	13
Restricted cash for debt redemption, principally Securitization	55	47
Proceeds from sale of nuclear decommissioning trust fund assets	48	69
Investment in nuclear decommissioning trust funds	(61)	(97)
Other	(24)	(55)
Net cash used for investing activities	(1,184)	(1,052)
Financing Activities
Issuance of long-term debt	495	908
Redemption of long-term debt	(447)	(1,161)
Short-term borrowings, net	(321)	126
Issuance of common stock	29	0
Repurchase of common stock	0	(18)
Dividends on common stock	(300)	(289)
Other	(10)	(19)
Net cash used for financing activities	(554)	(453)
Net Increase (Decrease) in Cash and Cash Equivalents	(9)	(19)
Cash and Cash Equivalents at Beginning of Period	68	65
Cash and Cash Equivalents at End of Period	$ 59	$ 46