Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows From Operating Activities:
Net income	$ 761	$ 739
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	802	745
Amortization of nuclear fuel	68	56
Amortization of debt issuance costs and premium/discounts	16	14
Deferred income taxes and investment tax credits, net	125	144
Allowance for equity funds used during construction	(25)	(20)
Stock-based compensation costs	16	15
Other	14	(11)
Changes in assets and liabilities:
Receivables	(113)	10
Inventories	(61)	(4)
Accounts and wages payable	(190)	(205)
Taxes accrued	154	118
Regulatory assets and liabilities	(55)	147
Assets, other	(66)	(56)
Liabilities, other	(76)	11
Pension and other postretirement benefits	(41)	(35)
Net cash provided by operating activities	1,329	1,668
Cash Flows From Investing Activities:
Capital expenditures	(1,884)	(1,761)
Nuclear fuel expenditures	(61)	(26)
Purchases of securities – nuclear decommissioning trust fund	(169)	(192)
Sales and maturities of securities – nuclear decommissioning trust fund	135	184
Purchase of bonds	0	(207)
Proceeds from sale of remarketed bonds	0	207
Other	(2)	(3)
Net cash used in investing activities	(1,981)	(1,798)
Cash Flows From Financing Activities:
Dividends on common stock	(367)	(350)
Dividends paid to noncontrolling interest holders	(5)	(5)
Short-term debt, net	(168)	(53)
Maturities of long-term debt	(85)	(329)
Issuances of long-term debt	1,263	900
Issuances of common stock	37	54
Employee payroll taxes related to stock-based compensation	(20)	(29)
Debt issuance costs	(11)	(10)
Net cash provided by financing activities	644	178
Net change in cash, cash equivalents, and restricted cash	(8)	48
Cash, cash equivalents, and restricted cash at beginning of year	176	107
Cash, cash equivalents, and restricted cash at end of period	168	155
Union Electric Company
Cash Flows From Operating Activities:
Net income	442	449
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	452	419
Amortization of nuclear fuel	68	56
Amortization of debt issuance costs and premium/discounts	4	4
Deferred income taxes and investment tax credits, net	(1)	(9)
Allowance for equity funds used during construction	(15)	(14)
Other	13	10
Changes in assets and liabilities:
Receivables	(93)	(32)
Inventories	(33)	3
Accounts and wages payable	(168)	(153)
Taxes accrued	158	148
Regulatory assets and liabilities	(56)	5
Assets, other	(10)	(37)
Liabilities, other	(46)	(4)
Pension and other postretirement benefits	(6)	(5)
Net cash provided by operating activities	709	840
Cash Flows From Investing Activities:
Capital expenditures	(778)	(751)
Nuclear fuel expenditures	(61)	(26)
Purchases of securities – nuclear decommissioning trust fund	(169)	(192)
Sales and maturities of securities – nuclear decommissioning trust fund	135	184
Purchase of bonds	0	(207)
Proceeds from sale of remarketed bonds	0	207
Money pool advances, net	5	0
Other	1	0
Net cash used in investing activities	(877)	(785)
Cash Flows From Financing Activities:
Dividends on common stock	0	(250)
Dividends on preferred stock	(3)	(3)
Short-term debt, net	(234)	89
Maturities of long-term debt	(85)	(329)
Issuances of long-term debt	465	450
Debt issuance costs	(4)	(6)
Net cash provided by financing activities	139	(49)
Net change in cash, cash equivalents, and restricted cash	(29)	6
Cash, cash equivalents, and restricted cash at beginning of year	39	8
Cash, cash equivalents, and restricted cash at end of period	10	14
Ameren Illinois Company
Cash Flows From Operating Activities:
Net income	282	249
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	322	303
Amortization of debt issuance costs and premium/discounts	9	9
Deferred income taxes and investment tax credits, net	72	42
Allowance for equity funds used during construction	(10)	(6)
Other	0	8
Changes in assets and liabilities:
Receivables	(9)	18
Inventories	(28)	(7)
Accounts and wages payable	(12)	(48)
Taxes accrued	(20)	14
Regulatory assets and liabilities	11	147
Assets, other	(52)	(15)
Liabilities, other	(30)	13
Pension and other postretirement benefits	(30)	(27)
Net cash provided by operating activities	515	706
Cash Flows From Investing Activities:
Capital expenditures	(1,031)	(900)
Other	1	(3)
Net cash used in investing activities	(1,030)	(903)
Cash Flows From Financing Activities:
Dividends on preferred stock	(2)	(2)
Short-term debt, net	189	237
Capital contributions from parent	350	0
Other	0	(1)
Net cash provided by financing activities	537	234
Net change in cash, cash equivalents, and restricted cash	22	37
Cash, cash equivalents, and restricted cash at beginning of year	125	80
Cash, cash equivalents, and restricted cash at end of period	$ 147	$ 117