CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Constellation Energy Group, Inc. and Subsidiaries) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net Income	$ 108.1	$ 83.8	$ 187.5	$ 275.1
Hedging instruments:
Reclassification of net loss on hedging instruments from OCI to net income, net of taxes	29.5	179.4	87.6	287.9
Net unrealized (loss) gain on hedging instruments, net of taxes	(47.4)	70.9	(42.0)	(162.0)
Available-for-sale securities:
Reclassification of net gain on sales of securities from OCI to net income, net of taxes				(0.1)
Net unrealized gain on securities, net of taxes	0.1		0.1	0.2
Defined benefit obligations:
Amortization of net actuarial loss, prior service cost, and transition obligation included in net periodic benefit cost, net of taxes	7.8	4.9	15.7	10.8
Net unrealized gain (loss) on foreign currency, net of taxes	0.3	(10.7)	1.8	(9.0)
Other comprehensive gain (loss) - equity investment in CENG, net of taxes	1.4	(22.1)	14.2	(12.2)
Other comprehensive loss - other equity method investees, net of taxes		(0.3)		(0.5)
Comprehensive income	99.8	305.9	264.9	390.2
Less: Comprehensive income attributable to noncontrolling interests, net of taxes	8.9	11.2	17.9	11.0
Comprehensive Income Attributable to Common Stock	$ 90.9	$ 294.7	$ 247.0	$ 379.2