Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Activities
Net Income	$ 158	$ 178
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	232	245
Deferred income taxes	58	48
Asset (gains), losses and reserves and impairments, net	(19)	11
Changes in assets and liabilities, exclusive of changes shown separately (Note 12)	191	240
Net cash from operating activities	620	722
Investing Activities
Plant and equipment expenditures — utility	(331)	(253)
Plant and equipment expenditures — non-utility	(61)	(17)
Proceeds from sale of assets	11	4
Restricted cash for debt redemption, principally Securitization	63	53
Proceeds from sale of nuclear decommissioning trust fund assets	11	20
Investment in nuclear decommissioning trust funds	(15)	(28)
Other	(21)	(23)
Net cash used for investing activities	(343)	(244)
Financing Activities
Redemption of long-term debt	(86)	(94)
Short-term borrowings, net	(106)	(150)
Issuance of common stock	10	0
Repurchase of common stock	0	(9)
Dividends on common stock	(99)	(95)
Other	(7)	2
Net cash used for financing activities	(288)	(346)
Net Increase (Decrease) in Cash and Cash Equivalents	(11)	132
Cash and Cash Equivalents at Beginning of Period	68	65
Cash and Cash Equivalents at End of Period	$ 57	$ 197