Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities
Net Income	$ 720	$ 639	$ 535
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	995	1,027	1,020
Deferred income taxes	220	457	205
Asset (gains), losses and reserves and impairments, net	(21)	(5)	(10)
Changes in assets and liabilities, exclusive of changes shown separately (Note 22)	94	(293)	69
Net cash from operating activities	2,008	1,825	1,819
Investing Activities
Plant and equipment expenditures — utility	(1,382)	(1,011)	(960)
Plant and equipment expenditures — non-utility	(102)	(88)	(75)
Proceeds from sale of assets	18	56	83
Restricted cash for debt redemption, principally Securitization	(5)	(32)	2
Proceeds from sale of nuclear decommissioning trust fund assets	80	377	295
Investment in nuclear decommissioning trust funds	(97)	(410)	(315)
Consolidation of VIEs	0	19	0
Investment in Millennium Pipeline Project	(3)	(49)	(15)
Other	(69)	(88)	(79)
Net cash used for investing activities	(1,560)	(1,226)	(1,064)
Financing Activities
Issuance of long-term debt, net	1,179	614	427
Redemption of long-term debt	(1,455)	(663)	(486)
Short-term borrowings	269	(177)	(417)
Issuance of common stock	0	36	35
Repurchase of common stock	(18)	0	0
Dividends on common stock	(389)	(360)	(348)
Other	(31)	(36)	0
Net cash used for financing activities	(445)	(586)	(789)
Net Increase (Decrease) in Cash and Cash Equivalents	3	13	(34)
Cash and Cash Equivalents at Beginning of Period	65	52	86
Cash and Cash Equivalents at End of Period	$ 68	$ 65	$ 52