Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Cash Flows From Operating Activities:
Net income (loss)	$ 98		$ (143)
Loss from discontinued operations, net of taxes	1		199
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	176		166
Amortization of nuclear fuel	24		20
Amortization of debt issuance costs and premium/discounts	5		6
Deferred income taxes and investment tax credits, net	84		40
Allowance for equity funds used during construction	(7)	[1]	(8)	[1]
Stock-based compensation costs	9		9
Other	(1)		(3)
Changes in assets and liabilities:
Receivables	(86)		(95)
Materials and supplies	102		127
Accounts and wages payable	(183)		(127)
Taxes accrued	18		41
Assets, other	(90)		52
Liabilities, other	49		29
Pension and other postretirement benefits	30		3
Counterparty collateral, net	10		26
Net cash provided by operating activities – continuing operations	239		342
Net cash provided by operating activities – discontinued operations			37
Net cash provided by operating activities	239		379
Cash Flows From Investing Activities:
Capital expenditures	(442)		(275)
Nuclear fuel expenditures	(10)		(11)
Purchases of securities - nuclear decommissioning trust fund	(186)		(35)
Sales and maturities of securities - nuclear decommissioning trust fund	182		32
Proceeds from Notes Receivable	56
Contributions to Note Receivable	(65)
Other			(2)
Net cash used in investing activities – continuing operations	(465)		(291)
Net cash provided by (used in) investing activities – discontinued operations	152		(12)
Net cash used in investing activities	(313)		(303)
Cash Flows From Financing Activities:
Dividends on common stock	(97)		(97)
Dividends paid to noncontrolling interest holders	(2)		(2)
Short-term debt, net	332
Redemptions of Other Long-term Debt	(163)
Net cash provided by (used in) financing activities – continuing operations	70		(99)
Net cash used in financing activities – discontinued operations
Net cash provided by (used in) financing activities	70		(99)
Net change in cash and cash equivalents	(4)		(23)
Cash and cash equivalents at beginning of period	30		209
Cash and cash equivalents at end of period	26		186
Less cash and cash equivalents at end of period, discontinued operations			25
Cash and cash equivalents at beginning of period	30
Cash and cash equivalents at end of period	26		161
Union Electric Company
Cash Flows From Operating Activities:
Net income (loss)	48		41
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	112		104
Amortization of nuclear fuel	24		20
Amortization of debt issuance costs and premium/discounts	2		2
Deferred income taxes and investment tax credits, net	30		(8)
Allowance for equity funds used during construction	(7)		(7)
Changes in assets and liabilities:
Receivables	2		(50)
Materials and supplies	14		22
Accounts and wages payable	(153)		(139)
Taxes accrued	30		38
Assets, other	(28)		38
Liabilities, other	7		5
Pension and other postretirement benefits	15		2
Net cash provided by operating activities	96		68
Cash Flows From Investing Activities:
Capital expenditures	(188)		(137)
Nuclear fuel expenditures	(10)		(11)
Money pool advances, net			24
Purchases of securities - nuclear decommissioning trust fund	(186)		(35)
Sales and maturities of securities - nuclear decommissioning trust fund	182		32
Other	(2)		(2)
Net cash used in investing activities	(204)		(129)
Cash Flows From Financing Activities:
Dividends on common stock	(77)		(90)
Dividends on preferred stock	(1)		(1)
Money pool borrowings, net	(105)		5
Short-term debt, net	290
Net cash provided by (used in) financing activities	107		(86)
Net change in cash and cash equivalents	(1)		(147)
Cash and cash equivalents at beginning of period	1		148
Cash and cash equivalents at end of period			1
Ameren Illinois Company
Cash Flows From Operating Activities:
Net income (loss)	54		32
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	62		60
Amortization of debt issuance costs and premium/discounts	3		3
Deferred income taxes and investment tax credits, net	36		50
Other	(2)		(1)
Changes in assets and liabilities:
Receivables	(94)		(58)
Materials and supplies	88		105
Accounts and wages payable	14		9
Taxes accrued	(1)		3
Assets, other	(61)		16
Liabilities, other	71		24
Pension and other postretirement benefits	10		1
Counterparty collateral, net	12		27
Net cash provided by operating activities	192		271
Cash Flows From Investing Activities:
Capital expenditures	(215)		(133)
Money pool advances, net			(5)
Other	1
Net cash used in investing activities	(214)		(138)
Cash Flows From Financing Activities:
Dividends on common stock			(15)
Dividends on preferred stock	(1)		(1)
Money pool borrowings, net	186		(24)
Redemptions of Other Long-term Debt	(163)
Net cash provided by (used in) financing activities	22		(40)
Net change in cash and cash equivalents			93
Cash and cash equivalents at beginning of period	1
Cash and cash equivalents at end of period	$ 1		$ 93

[1] Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.