Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities
Net Income	$ 305	$ 378
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	482	493
Deferred income taxes	81	14
Asset (gains), losses and reserves and impairments, net	(7)	8
Changes in assets and liabilities, exclusive of changes shown separately (Note 14)	300	266
Net cash from operating activities	1,161	1,159
Investing Activities
Plant and equipment expenditures — utility	(708)	(684)
Plant and equipment expenditures — non-utility	(131)	(35)
Proceeds from sale of assets	15	9
Restricted cash for debt redemption, principally Securitization	15	2
Proceeds from sale of nuclear decommissioning trust fund assets	36	59
Investment in nuclear decommissioning trust funds	(44)	(76)
Other	(15)	(42)
Net cash used for investing activities	(832)	(767)
Financing Activities
Issuance of long-term debt	496	547
Redemption of long-term debt	(140)	(721)
Short-term borrowings, net	(380)	1
Issuance of common stock	20	0
Repurchase of common stock	0	(18)
Dividends on common stock	(199)	(190)
Other	(9)	(15)
Net cash used for financing activities	(212)	(396)
Net Increase (Decrease) in Cash and Cash Equivalents	117	(4)
Cash and Cash Equivalents at Beginning of Period	68	65
Cash and Cash Equivalents at End of Period	$ 185	$ 61