Consolidated Condensed Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating Activities
Net Income	$ 447.5	$ 410.2
Reconciliation to cash
Depreciation and amortization	278.2	248.9
Deferred income taxes and investment tax credits, net	249.6	215.9
Contributions to qualified benefit plans	(100.0)	(257.4)
Change in -
Accounts receivable and accrued revenues	118.7	136.4
Inventories	39.9	11.1
Other current assets	50.6	(18.7)
Accounts payable	(56.5)	(41.8)
Accrued income taxes, net	107.6	69.1
Other current liabilities	(15.3)	27.1
Other, net	(127.9)	26.8
Cash Provided by Operating Activities	992.4	827.6
Investing Activities
Capital expenditures	(477.5)	(612.2)
Investment in transmission affiliate	(13.1)	(6.6)
Proceeds from asset sales	3.0	38.5
Change in restricted cash	36.0	(37.2)
Other, net	(39.8)	(32.8)
Cash Used in Investing Activities	(491.4)	(650.3)
Financing Activities
Exercise of stock options	45.3	34.4
Purchase of common stock	(105.0)	(135.1)
Dividends paid on common stock	(207.4)	(182.0)
Issuance of long-term debt	0	720.0
Retirement and repurchase of long-term debt	(18.3)	(464.7)
Change in short-term debt	(216.7)	(161.2)
Other, net	0	1.9
Cash Used in Financing Activities	(502.1)	(186.7)
Change in Cash and Cash Equivalents	(1.1)	(9.4)
Cash and Cash Equivalents at Beginning of Period	14.1	24.5
Cash and Cash Equivalents at End of Period	$ 13.0	$ 15.1