Consolidated Statement of Cash Flows - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Cash Flows From Operating Activities:
Net income		$ 298	$ 255
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		433	419
Amortization of nuclear fuel		48	38
Amortization of debt issuance costs and premium/discounts		11	11
Deferred income taxes and investment tax credits, net		175	134
Allowance for equity funds used during construction	[1]	(10)	(13)
Share-based compensation costs		8	12
Other		(5)	(7)
Changes in assets and liabilities:
Receivables		(54)	(111)
Inventories		14	23
Accounts and wages payable		(183)	(200)
Taxes accrued		83	80
Regulatory assets and liabilities		(4)	108
Assets, other		22	24
Liabilities, other		21	(14)
Pension and other postretirement benefits		6	4
Net cash provided by operating activities		863	763
Cash Flows From Investing Activities:
Capital expenditures		(998)	(1,000)
Nuclear fuel expenditures		(50)	(24)
Purchases of securities - nuclear decommissioning trust fund		(213)	(201)
Sales and maturities of securities - nuclear decommissioning trust fund		204	192
Other		(2)	(2)
Net cash used in investing activities		(1,059)	(1,035)
Cash Flows From Financing Activities:
Dividends on common stock		(214)	(206)
Dividends paid to noncontrolling interest holders		(3)	(3)
Short-term debt, net		334	477
Maturities of Long-term Debt		(425)	(389)
Proceeds from Issuance of Long-term Debt		549	149
Share-based payments		(39)	(32)
Capital issuance costs		(4)	(1)
Other		(1)	(2)
Net cash provided by (used in) financing activities		197	(7)
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		10	13
Union Electric Company
Cash Flows From Operating Activities:
Net income		127	108
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		255	257
Amortization of nuclear fuel		48	38
Amortization of debt issuance costs and premium/discounts		3	3
Deferred income taxes and investment tax credits, net		13	66
Allowance for equity funds used during construction		(9)	(10)
Other		3	0
Changes in assets and liabilities:
Receivables		(124)	(103)
Inventories		(7)	(9)
Accounts and wages payable		(169)	(174)
Taxes accrued		153	80
Regulatory assets and liabilities		57	55
Assets, other		19	14
Liabilities, other		24	37
Pension and other postretirement benefits		3	2
Net cash provided by operating activities		396	364
Cash Flows From Investing Activities:
Capital expenditures		(355)	(353)
Nuclear fuel expenditures		(50)	(24)
Purchases of securities - nuclear decommissioning trust fund		(213)	(201)
Sales and maturities of securities - nuclear decommissioning trust fund		204	192
Money pool advances, net		161	36
Other		0	(4)
Net cash used in investing activities		(253)	(354)
Cash Flows From Financing Activities:
Dividends on common stock		(172)	(210)
Dividends on preferred stock		(2)	(2)
Short-term debt, net		60	77
Maturities of Long-term Debt		(425)	(260)
Proceeds from Issuance of Long-term Debt		399	149
Capital contribution from parent		0	38
Capital issuance costs		(3)	(1)
Net cash provided by (used in) financing activities		(143)	(209)
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		138	106
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		168	156
Amortization of debt issuance costs and premium/discounts		7	7
Deferred income taxes and investment tax credits, net		116	65
Allowance for equity funds used during construction		(1)	(3)
Other		0	(6)
Changes in assets and liabilities:
Receivables		70	(5)
Inventories		20	32
Accounts and wages payable		(17)	(20)
Taxes accrued		(68)	(14)
Regulatory assets and liabilities		(54)	48
Assets, other		3	11
Liabilities, other		(10)	(1)
Pension and other postretirement benefits		2	3
Net cash provided by operating activities		375	382
Cash Flows From Investing Activities:
Capital expenditures		(484)	(442)
Other		4	4
Net cash used in investing activities		(480)	(438)
Cash Flows From Financing Activities:
Dividends on common stock		0	(60)
Dividends on preferred stock		(2)	(2)
Short-term debt, net		108	177
Maturities of Long-term Debt		0	(129)
Other		(1)	(1)
Net cash provided by (used in) financing activities		105	(15)
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.