Consolidated Statement of Cash Flows - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Cash Flows From Operating Activities:
Net income		$ 588	$ 626
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		653	625
Amortization of nuclear fuel		71	63
Amortization of debt issuance costs and premium/discounts		16	17
Deferred income taxes and investment tax credits, net		366	364
Allowance for equity funds used during construction	[1]	(16)	(20)
Share-based compensation costs		12	17
Other		(7)	(9)
Changes in assets and liabilities:
Receivables		(59)	(134)
Inventories		(20)	(13)
Accounts and wages payable		(183)	(196)
Taxes accrued		138	119
Regulatory assets and liabilities		89	146
Assets, other		14	9
Liabilities, other		12	(29)
Pension and other postretirement benefits		(31)	(26)
Net cash provided by operating activities		1,643	1,559
Cash Flows From Investing Activities:
Capital expenditures		(1,523)	(1,496)
Nuclear fuel expenditures		(52)	(41)
Purchases of securities - nuclear decommissioning trust fund		(248)	(310)
Sales and maturities of securities - nuclear decommissioning trust fund		235	297
Other		3	(1)
Net cash used in investing activities		(1,585)	(1,551)
Cash Flows From Financing Activities:
Dividends on common stock		(320)	(309)
Dividends paid to noncontrolling interest holders		(5)	(5)
Short-term debt, net		(112)	307
Maturities of Long-term Debt		(425)	(389)
Proceeds from Issuance of Long-term Debt		849	149
Share-based payments		(39)	(32)
Debt issuance costs		(5)	(1)
Other		(1)	(2)
Net cash used in financing activities		(58)	(282)
Net change in cash and cash equivalents		0	(274)
Cash and cash equivalents at beginning of period		9	292
Cash and cash equivalents at end of period		9	18
Union Electric Company
Cash Flows From Operating Activities:
Net income		362	350
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		384	381
Amortization of nuclear fuel		71	63
Amortization of debt issuance costs and premium/discounts		5	5
Deferred income taxes and investment tax credits, net		55	159
Allowance for equity funds used during construction		(15)	(16)
Other		4	0
Changes in assets and liabilities:
Receivables		(117)	(95)
Inventories		(3)	(5)
Accounts and wages payable		(151)	(176)
Taxes accrued		160	165
Regulatory assets and liabilities		48	60
Assets, other		19	(8)
Liabilities, other		4	13
Pension and other postretirement benefits		(7)	(8)
Net cash provided by operating activities		819	888
Cash Flows From Investing Activities:
Capital expenditures		(533)	(500)
Nuclear fuel expenditures		(52)	(41)
Purchases of securities - nuclear decommissioning trust fund		(248)	(310)
Sales and maturities of securities - nuclear decommissioning trust fund		235	297
Money pool advances, net		143	(165)
Other		0	(5)
Net cash used in investing activities		(455)	(724)
Cash Flows From Financing Activities:
Dividends on common stock		(332)	(285)
Dividends on preferred stock		(3)	(3)
Maturities of Long-term Debt		(425)	(260)
Proceeds from Issuance of Long-term Debt		399	149
Capital contribution from parent		0	38
Debt issuance costs		(3)	(1)
Net cash used in financing activities		(364)	(362)
Net change in cash and cash equivalents		0	(198)
Cash and cash equivalents at beginning of period		0	199
Cash and cash equivalents at end of period		0	1
Ameren Illinois Company
Cash Flows From Operating Activities:
Net income		193	225
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		254	236
Amortization of debt issuance costs and premium/discounts		10	11
Deferred income taxes and investment tax credits, net		161	141
Allowance for equity funds used during construction		(1)	(4)
Other		(1)	(8)
Changes in assets and liabilities:
Receivables		59	(36)
Inventories		(17)	(8)
Accounts and wages payable		(24)	(17)
Taxes accrued		(22)	5
Regulatory assets and liabilities		45	75
Assets, other		(9)	11
Liabilities, other		(2)	6
Pension and other postretirement benefits		(19)	(14)
Net cash provided by operating activities		628	627
Cash Flows From Investing Activities:
Capital expenditures		(760)	(683)
Other		6	4
Net cash used in investing activities		(754)	(679)
Cash Flows From Financing Activities:
Dividends on common stock		0	(95)
Dividends on preferred stock		(2)	(2)
Short-term debt, net		118	157
Money pool borrowings, net		11	54
Maturities of Long-term Debt		0	(129)
Other		(1)	(1)
Net cash used in financing activities		126	(16)
Net change in cash and cash equivalents		0	(68)
Cash and cash equivalents at beginning of period		0	71
Cash and cash equivalents at end of period		$ 0	$ 3

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