Consolidated Statement of Cash Flows - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Cash Flows From Operating Activities:
Net income		$ 104	$ 107
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		217	210
Amortization of nuclear fuel		24	24
Amortization of debt issuance costs and premium/discounts		6	6
Deferred income taxes and investment tax credits, net		51	42
Allowance for equity funds used during construction	[1]	(6)	(8)
Share-based compensation costs		4	6
Other		(4)	(3)
Changes in assets and liabilities:
Receivables		44	55
Inventories		60	55
Accounts and wages payable		(231)	(246)
Taxes accrued		36	30
Regulatory assets and liabilities		7	81
Assets, other		7	7
Liabilities, other		3	(26)
Pension and other postretirement benefits		9	9
Net cash provided by operating activities		331	349
Cash Flows From Investing Activities:
Capital expenditures		(504)	(496)
Nuclear fuel expenditures		(27)	(21)
Purchases of securities - nuclear decommissioning trust fund		(64)	(130)
Sales and maturities of securities - nuclear decommissioning trust fund		58	125
Other		(2)	12
Net cash used in investing activities		(539)	(510)
Cash Flows From Financing Activities:
Dividends on common stock		(107)	(103)
Dividends paid to noncontrolling interest holders		(2)	(2)
Short-term debt, net		356	280
Maturities of Long-term Debt		0	(260)
Share-based payments		(39)	(32)
Other		(1)	(1)
Net cash provided by (used in) financing activities		207	(118)
Net change in cash and cash equivalents		(1)	(279)
Cash and cash equivalents at beginning of period		9	292
Cash and cash equivalents at end of period		8	13
Union Electric Company
Cash Flows From Operating Activities:
Net income		6	15
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		127	130
Amortization of nuclear fuel		24	24
Amortization of debt issuance costs and premium/discounts		2	2
Deferred income taxes and investment tax credits, net		2	9
Allowance for equity funds used during construction		(5)	(7)
Other		1	0
Changes in assets and liabilities:
Receivables		28	81
Inventories		11	(2)
Accounts and wages payable		(186)	(172)
Taxes accrued		35	31
Regulatory assets and liabilities		29	45
Assets, other		11	5
Liabilities, other		4	3
Pension and other postretirement benefits		4	5
Net cash provided by operating activities		93	169
Cash Flows From Investing Activities:
Capital expenditures		(196)	(178)
Nuclear fuel expenditures		(27)	(21)
Purchases of securities - nuclear decommissioning trust fund		(64)	(130)
Sales and maturities of securities - nuclear decommissioning trust fund		58	125
Money pool advances, net		161	36
Other		0	(2)
Net cash used in investing activities		(68)	(170)
Cash Flows From Financing Activities:
Dividends on common stock		(60)	(140)
Dividends on preferred stock		(1)	(1)
Short-term debt, net		36	165
Maturities of Long-term Debt		0	(260)
Capital contribution from parent		0	38
Net cash provided by (used in) financing activities		(25)	(198)
Net change in cash and cash equivalents		0	(199)
Cash and cash equivalents at beginning of period		0	199
Cash and cash equivalents at end of period		0	0
Ameren Illinois Company
Cash Flows From Operating Activities:
Net income		80	60
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		83	77
Amortization of debt issuance costs and premium/discounts		3	4
Deferred income taxes and investment tax credits, net		51	37
Allowance for equity funds used during construction		(1)	(1)
Other		0	(3)
Changes in assets and liabilities:
Receivables		16	(22)
Inventories		49	57
Accounts and wages payable		(51)	(33)
Taxes accrued		(2)	(3)
Regulatory assets and liabilities		(19)	32
Assets, other		2	7
Liabilities, other		(5)	12
Pension and other postretirement benefits		5	4
Net cash provided by operating activities		212	229
Cash Flows From Investing Activities:
Capital expenditures		(227)	(211)
Money pool advances, net		0	(58)
Net cash used in investing activities		(227)	(269)
Cash Flows From Financing Activities:
Dividends on common stock		0	(30)
Dividends on preferred stock		(1)	(1)
Short-term debt, net		17	0
Other		(1)	0
Net cash provided by (used in) financing activities		15	(31)
Net change in cash and cash equivalents		0	(71)
Cash and cash equivalents at beginning of period		0	71
Cash and cash equivalents at end of period		$ 0	$ 0

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