Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows From Operating Activities:
Net income	$ 193	$ 153
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	245	230
Amortization of nuclear fuel	23	24
Amortization of debt issuance costs and premium/discounts	5	5
Deferred income taxes and investment tax credits, net	32	26
Allowance for equity funds used during construction	(6)	(5)
Stock-based compensation costs	6	6
Other	(8)	2
Changes in assets and liabilities:
Receivables	4	(26)
Inventories	81	68
Accounts and wages payable	(213)	(249)
Taxes accrued	28	49
Regulatory assets and liabilities	26	20
Assets, other	(14)	1
Liabilities, other	(11)	(57)
Pension and other postretirement benefits	(4)	11
Net cash provided by operating activities	387	258
Cash Flows From Investing Activities:
Capital expenditures	(544)	(579)
Nuclear fuel expenditures	(21)	(12)
Purchases of securities - nuclear decommissioning trust fund	(39)	(38)
Sales and maturities of securities - nuclear decommissioning trust fund	36	34
Other	1	(2)
Net cash used in investing activities	(567)	(597)
Cash Flows From Financing Activities:
Dividends on common stock	(116)	(111)
Dividends paid to noncontrolling interest holders	(2)	(2)
Short-term debt, net	202	475
Repayments of Long-term Debt	(329)	0
Proceeds from Issuance of Long-term Debt	450	0
Issuance of common stock	19	17
Employee payroll taxes related to stock-based compensation	(29)	(19)
Payment of Financing and Stock Issuance Costs	(4)	0
Net cash provided by financing activities	191	360
Net change in cash, cash equivalents, and restricted cash	11	21
Cash, cash equivalents, and restricted cash at beginning of year	107	68
Cash, cash equivalents, and restricted cash at end of period	118	89
Noncash financing activity - Issuance of common stock for stock-based compensation	54	35
Union Electric Company
Cash Flows From Operating Activities:
Net income	40	39
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	138	132
Amortization of nuclear fuel	23	24
Amortization of debt issuance costs and premium/discounts	2	2
Deferred income taxes and investment tax credits, net	(1)	(1)
Allowance for equity funds used during construction	(4)	(4)
Other	2	4
Changes in assets and liabilities:
Receivables	56	4
Inventories	29	5
Accounts and wages payable	(167)	(192)
Taxes accrued	44	36
Regulatory assets and liabilities	11	38
Assets, other	(16)	(5)
Liabilities, other	(4)	(10)
Pension and other postretirement benefits	(1)	4
Net cash provided by operating activities	152	76
Cash Flows From Investing Activities:
Capital expenditures	(240)	(249)
Nuclear fuel expenditures	(21)	(12)
Purchases of securities - nuclear decommissioning trust fund	(39)	(38)
Sales and maturities of securities - nuclear decommissioning trust fund	36	34
Net cash used in investing activities	(264)	(265)
Cash Flows From Financing Activities:
Dividends on common stock	0	(50)
Dividends on preferred stock	(1)	(1)
Short-term debt, net	0	243
Repayments of Long-term Debt	(329)	0
Proceeds from Issuance of Long-term Debt	450	0
Payment of Financing and Stock Issuance Costs	(4)	0
Net cash provided by financing activities	116	192
Net change in cash, cash equivalents, and restricted cash	4	3
Cash, cash equivalents, and restricted cash at beginning of year	8	7
Cash, cash equivalents, and restricted cash at end of period	12	10
Ameren Illinois Company
Cash Flows From Operating Activities:
Net income	121	96
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	100	90
Amortization of debt issuance costs and premium/discounts	3	3
Deferred income taxes and investment tax credits, net	24	9
Allowance for equity funds used during construction	(2)	(1)
Other	(1)	(2)
Changes in assets and liabilities:
Receivables	(56)	(34)
Inventories	52	63
Accounts and wages payable	(34)	(52)
Taxes accrued	12	1
Regulatory assets and liabilities	18	(16)
Assets, other	3	2
Liabilities, other	(12)	(36)
Pension and other postretirement benefits	(3)	6
Net cash provided by operating activities	227	130
Cash Flows From Investing Activities:
Capital expenditures	(267)	(300)
Net cash used in investing activities	(267)	(300)
Cash Flows From Financing Activities:
Dividends on preferred stock	(1)	(1)
Short-term debt, net	54	162
Capital contribution from parent	0	20
Net cash provided by financing activities	53	181
Net change in cash, cash equivalents, and restricted cash	13	11
Cash, cash equivalents, and restricted cash at beginning of year	80	41
Cash, cash equivalents, and restricted cash at end of period	$ 93	$ 52