Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2011

Other Comprehensive Income [Abstract]

Schedule Of Comprehensive Income

	Three Months						Nine Months
	2011			2010			2011			2010
Ameren:(a)
Net income (loss)	$	287		$	(164	)	$	500		$	97
Unrealized net gain (loss) on derivative hedging instruments, net of taxes (benefit) of $(2), $9, $(6), and $20, respectively		(2	)		14			(8	)		31
Reclassification adjustments for derivative (gain) loss included in net income, net of taxes (benefit) of $1, $8, $(1), and $20, respectively		(1	)		(14	)		2			(34	)
Pension and other postretirement activity, net of income taxes (benefit) of $-, $- $(2), and $6, respectively		(1	)		-			(2	)		6
Total comprehensive income (loss), net of taxes	$	283		$	(164	)	$	492		$	100
Less: Net income attributable to noncontrolling interests, net of taxes		2			3			6			10
Total comprehensive income (loss) attributable to Ameren Corporation, net of taxes	$	281		$	(167	)	$	486		$	90
Ameren Illinois:
Net income	$	98		$	110		$	170		$	215
Pension and other postretirement activity, net of income taxes (benefit) of $(1), $(1), $(2), and $(1), respectively		(1	)		(1	)		(3	)		(2	)
Total comprehensive income, net of taxes	$	97		$	109		$	167		$	213
Genco:
Net income (loss)	$	(4	)	$	(100	)	$	31		$	(62	)
Pension and other postretirement activity, net of income taxes (benefit) of $-, $-, $1, and $5, respectively		1			-			2			4
Total comprehensive income (loss), net of taxes	$	(3	)	$	(100	)	$	33		$	(58	)
Less: Net income attributable to noncontrolling interest, net of taxes		1			1			2			3
Total comprehensive income (loss) attributable to Genco	$	(4	)	$	(101	)	$	31		$	(61	)

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.