Consolidated Statement of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows From Operating Activities:
Net income	$ 373	$ 393
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	494	463
Amortization of nuclear fuel	33	48
Amortization of debt issuance costs and premium/discounts	9	11
Deferred income taxes and investment tax credits, net	54	81
Allowance for equity funds used during construction	(13)	(14)
Stock-based compensation costs	10	10
Other	(5)	11
Changes in assets and liabilities:
Receivables	(46)	(170)
Inventories	50	46
Accounts and wages payable	(199)	(209)
Taxes accrued	77	105
Regulatory assets and liabilities	4	83
Assets, other	(11)	8
Liabilities, other	63	(50)
Pension and other postretirement benefits	(14)	4
Net cash provided by operating activities	879	820
Cash Flows From Investing Activities:
Capital expenditures	(1,125)	(1,112)
Nuclear fuel expenditures	(25)	(16)
Purchases of securities - nuclear decommissioning trust fund	(96)	(129)
Sales and maturities of securities - nuclear decommissioning trust fund	95	122
Purchase of bonds	(97)	0
Proceeds from sale of remarketed bonds	97	0
Other	(3)	6
Net cash used in investing activities	(1,154)	(1,129)
Cash Flows From Financing Activities:
Dividends on common stock	(233)	(223)
Dividends paid to noncontrolling interest holders	(3)	(3)
Short-term debt, net	401	21
Repayments of Long-term Debt	(329)	(323)
Proceeds from Issuance of Long-term Debt	450	853
Issuance of common stock	37	40
Employee payroll taxes related to stock-based compensation	(29)	(19)
Payment of Financing and Stock Issuance Costs	(4)	(9)
Net cash provided by financing activities	290	337
Net change in cash, cash equivalents, and restricted cash	15	28
Cash, cash equivalents, and restricted cash at beginning of year	107	68
Cash, cash equivalents, and restricted cash at end of period	122	96
Noncash financing activity - Issuance of common stock for stock-based compensation	54	35
Union Electric Company
Cash Flows From Operating Activities:
Net income	148	208
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	277	265
Amortization of nuclear fuel	33	48
Amortization of debt issuance costs and premium/discounts	2	3
Deferred income taxes and investment tax credits, net	(10)	(24)
Allowance for equity funds used during construction	(8)	(11)
Other	5	10
Changes in assets and liabilities:
Receivables	(83)	(205)
Inventories	22	8
Accounts and wages payable	(158)	(160)
Taxes accrued	109	152
Regulatory assets and liabilities	7	106
Assets, other	(9)	(2)
Liabilities, other	28	11
Pension and other postretirement benefits	(2)	3
Net cash provided by operating activities	361	412
Cash Flows From Investing Activities:
Capital expenditures	(495)	(454)
Nuclear fuel expenditures	(25)	(16)
Purchases of securities - nuclear decommissioning trust fund	(96)	(129)
Sales and maturities of securities - nuclear decommissioning trust fund	95	122
Purchase of bonds	(97)	0
Proceeds from sale of remarketed bonds	97	0
Money pool advances, net	0	(66)
Net cash used in investing activities	(521)	(543)
Cash Flows From Financing Activities:
Dividends on common stock	(100)	(50)
Dividends on preferred stock	(2)	(2)
Short-term debt, net	150	(39)
Repayments of Long-term Debt	(329)	(179)
Proceeds from Issuance of Long-term Debt	450	423
Payment of Financing and Stock Issuance Costs	(4)	(4)
Net cash provided by financing activities	165	149
Net change in cash, cash equivalents, and restricted cash	5	18
Cash, cash equivalents, and restricted cash at beginning of year	8	7
Cash, cash equivalents, and restricted cash at end of period	13	25
Ameren Illinois Company
Cash Flows From Operating Activities:
Net income	184	159
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	201	184
Amortization of debt issuance costs and premium/discounts	6	7
Deferred income taxes and investment tax credits, net	43	13
Allowance for equity funds used during construction	(5)	(3)
Other	0	(3)
Changes in assets and liabilities:
Receivables	35	23
Inventories	28	38
Accounts and wages payable	(38)	(35)
Taxes accrued	(22)	(23)
Regulatory assets and liabilities	1	(20)
Assets, other	1	4
Liabilities, other	24	(58)
Pension and other postretirement benefits	(11)	(2)
Net cash provided by operating activities	452	287
Cash Flows From Investing Activities:
Capital expenditures	(556)	(602)
Other	(2)	3
Net cash used in investing activities	(558)	(599)
Cash Flows From Financing Activities:
Dividends on preferred stock	(2)	(2)
Short-term debt, net	127	(62)
Money pool borrowings, net	0	31
Repayments of Long-term Debt	0	(144)
Proceeds from Issuance of Long-term Debt	0	430
Payment of Financing and Stock Issuance Costs	0	(5)
Capital contribution from parent	0	80
Net cash provided by financing activities	125	328
Net change in cash, cash equivalents, and restricted cash	19	16
Cash, cash equivalents, and restricted cash at beginning of year	80	41
Cash, cash equivalents, and restricted cash at end of period	$ 99	$ 57