CONSOLIDATED BALANCE SHEETS (Constellation Energy Group, Inc. and Subsidiaries) (USD $) In Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 954.8	$ 2,028.5
Accounts receivable (net of allowance for uncollectibles of $84.9 and $85.0, respectively)	1,965.8	2,059.2
Accounts receivable-consolidated variable interest entities (net of allowance for uncollectibles of $95.7 and $87.9, respectively)	260.7	308.9
Income taxes receivable	81.3	152.7
Fuel stocks	394.1	361.1
Materials and supplies	136.3	104.3
Derivative assets	324.3	534.4
Unamortized energy contract assets (includes $210.4 and $400.9, respectively, related to CENG)	335.3	544.7
Restricted cash	2.1	52.0
Restricted cash-consolidated variable interest entities	46.0	52.3
Other	241.4	254.5
Total current assets	4,742.1	6,452.6
Investments and Other Noncurrent Assets
Investment in CENG	2,974.9	2,991.1
Other investments	197.7	189.9
Regulatory assets (net)	370.8	374.1
Goodwill	180.8	77.0
Derivative assets	257.5	258.9
Unamortized energy contract assets	67.9	109.8
Other	302.5	286.3
Total investments and other noncurrent assets	4,352.1	4,287.1
Property, Plant and Equipment
Property, plant and equipment	15,052.5	13,588.9
Accumulated depreciation	(4,433.3)	(4,310.1)
Net property, plant and equipment	10,619.2	9,278.8
Total Assets	19,713.4	20,018.5
Current Liabilities
Short-term borrowings	20.6	32.4
Current portion of long-term debt	131.5	245.6
Current portion of long-term debt-consolidated variable interest entities	61.3	59.7
Accounts payable	987.0	1,072.6
Accounts payable-consolidated variable interest entities	151.7	189.8
Derivative liabilities	494.2	622.3
Unamortized energy contract liabilities	130.9	130.5
Deferred income taxes	20.2	56.5
Accrued taxes	85.1	71.0
Accrued expenses	261.5	358.1
Other	551.6	438.7
Total current liabilities	2,895.6	3,277.2
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes	2,667.6	2,489.8
Asset retirement obligations	33.4	32.3
Derivative liabilities	270.1	353.0
Unamortized energy contract liabilities	362.0	411.1
Defined benefit obligations	588.0	574.7
Deferred investment tax credits	25.4	27.6
Other	248.5	296.0
Total deferred credits and other noncurrent liabilities	4,195.0	4,184.5
Long-term Debt, Net of Current Portion	3,947.5	4,054.2
Long-term Debt, Net of Current Portion-consolidated variable interest entities	370.8	394.6
Common shareholders' equity:
Common stock	3,265.5	3,231.7
Retained earnings	5,344.9	5,270.8
Accumulated other comprehensive loss	(595.9)	(673.3)
Total common shareholders' equity	8,014.5	7,829.2
BGE preference stock not subject to mandatory redemption	190.0	190.0
Noncontrolling interests	100.0	88.8
Total equity	8,304.5	8,108.0
Commitments, Guarantees, and Contingencies (see Notes)
Total Liabilities and Equity	$ 19,713.4	$ 20,018.5