Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Activities
Net Income	$ 618	$ 720	$ 639
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	1,018	995	1,027
Deferred income taxes	47	220	457
Gain (Loss) on Sale of Business	83	0	0
Asset (gains), losses and reserves and impairments, net	1	(21)	(5)
Changes in assets and liabilities, exclusive of changes shown separately (Note 22)	442	94	(293)
Net cash from operating activities	2,209	2,008	1,825
Investing Activities
Plant and equipment expenditures — utility	(1,451)	(1,382)	(1,011)
Plant and equipment expenditures — non-utility	(369)	(102)	(88)
Proceeds from Divestiture of Businesses	255	0	0
Proceeds from sale of assets	38	18	56
Restricted cash for debt redemption, principally Securitization	2	(5)	(32)
Payments to Acquire Businesses, Net of Cash Acquired	(198)	0	0
Proceeds from sale of nuclear decommissioning trust fund assets	97	80	377
Investment in nuclear decommissioning trust funds	(102)	(97)	(410)
Consolidation of VIEs	0	0	19
Investment in Millennium Pipeline Project	0	(3)	(49)
Other	(41)	(69)	(88)
Net cash used for investing activities	(1,769)	(1,560)	(1,226)
Financing Activities
Issuance of long-term debt, net	759	1,179	614
Redemption of long-term debt	(639)	(1,455)	(663)
Short-term borrowings	(179)	269	(177)
Issuance of common stock	39	0	36
Repurchase of common stock	0	(18)	0
Dividends on common stock	(407)	(389)	(360)
Other	(16)	(31)	(36)
Net cash used for financing activities	(443)	(445)	(586)
Net Increase (Decrease) in Cash and Cash Equivalents	(3)	3	13
Cash and Cash Equivalents at Beginning of Period	68	65	52
Cash and Cash Equivalents at End of Period	$ 65	$ 68	$ 65