CONSOLIDATED BALANCE SHEETS (Constellation Energy Group, Inc. and Subsidiaries) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 964.5	$ 2,028.5
Accounts receivable (net of allowance for uncollectibles of $87.1 and $85.0, respectively)	1,907.6	2,059.2
Accounts receivable-consolidated variable interest entities (net of allowance for uncollectibles of $115.5 and $87.9, respectively)	247.9	308.9
Income taxes receivable	156.6	152.7
Fuel stocks	423.1	361.1
Materials and supplies	129.6	104.3
Derivative assets	357.9	534.4
Unamortized energy contract assets (includes $- and $400.9, respectively, related to CENG)	52.1	544.7
Restricted cash	2.3	52.0
Restricted cash-consolidated variable interest entities	44.8	52.3
Regulatory assets (net)	153.7	78.7
Deferred income taxes	132.0
Other	246.4	175.8
Total current assets	4,818.5	6,452.6
Investments and Other Noncurrent Assets
Investment in CENG	2,150.4	2,991.1
Other investments	122.4	189.9
Regulatory assets (net)	341.9	374.1
Goodwill	282.2	77.0
Derivative assets	259.3	258.9
Unamortized energy contract assets	58.4	109.8
Other	380.5	284.5
Other-consolidated variable interest entities	95.7	1.8
Total investments and other noncurrent assets	3,690.8	4,287.1
Property, Plant and Equipment
Nonregulated property, plant and equipment	7,780.4	6,387.2
Regulated property, plant and equipment	7,595.0	7,201.7
Accumulated depreciation	(4,472.1)	(4,310.1)
Net property, plant and equipment	10,903.3	9,278.8
Total Assets	19,412.6	20,018.5
Current Liabilities
Short-term borrowings		32.4
Short-term borrowings-consolidated variable interest entities	39.5
Current portion of long-term debt	109.6	245.6
Current portion of long-term debt-consolidated variable interest entities	65.3	59.7
Accounts payable	924.8	1,072.6
Accounts payable-consolidated variable interest entities	177.2	189.8
Customer deposits and collateral	95.2	87.2
Derivative liabilities	779.5	622.3
Unamortized energy contract liabilities	118.1	130.5
Deferred income taxes		56.5
Accrued taxes	90.4	71.0
Accrued expenses	431.4	358.1
Other	456.8	351.5
Total current liabilities	3,287.8	3,277.2
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes	2,305.1	2,489.8
Asset retirement obligations	37.6	32.3
Derivative liabilities	268.4	353.0
Unamortized energy contract liabilities	294.8	411.1
Defined benefit obligations	698.0	574.7
Deferred investment tax credits	23.6	27.6
Other	251.7	296.0
Total deferred credits and other noncurrent liabilities	3,879.2	4,184.5
Long-term Debt, Net of Current Portion	4,456.4	4,054.2
Long-term Debt, Net of Current Portion-consolidated variable interest entities	388.4	394.6
Equity
Common shareholders' equity	7,093.9	7,829.2
BGE preference stock not subject to mandatory redemption	190.0	190.0
Noncontrolling interests	116.9	88.8
Total equity	7,400.8	8,108.0
Commitments, Guarantees, and Contingencies (see Note 12)
Total Liabilities and Equity	$ 19,412.6	$ 20,018.5