Consolidated Statement of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flows From Operating Activities:
Net income	$ 443	$ 392
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	596	532
Amortization of nuclear fuel	20	45
Amortization of debt issuance costs and premium/discounts	11	11
Deferred income taxes and investment tax credits, net	59	68
Allowance for equity funds used during construction	(16)	(13)
Stock-based compensation costs	11	11
Other	2	5
Changes in assets and liabilities:
Receivables	(92)	(161)
Inventories	(5)	(19)
Accounts and wages payable	(208)	(193)
Taxes accrued	104	108
Regulatory assets and liabilities	(441)	(87)
Assets, other	(66)	(9)
Liabilities, other	17	9
Pension and other postretirement benefits	1	(5)
Net cash provided by operating activities	436	694
Cash Flows From Investing Activities:
Capital expenditures	(1,346)	(1,228)
Wind generation expenditures	(417)	0
Nuclear fuel expenditures	(4)	(56)
Purchases of securities – nuclear decommissioning trust fund	(203)	(153)
Sales and maturities of securities – nuclear decommissioning trust fund	208	121
Other	2	1
Net cash used in investing activities	(1,760)	(1,315)
Cash Flows From Financing Activities:
Dividends on common stock	(282)	(244)
Dividends paid to noncontrolling interest holders	(3)	(3)
Short-term debt, net	(59)	(320)
Maturities of long-term debt	0	(85)
Issuances of long-term debt	1,423	1,263
Issuances of common stock	258	27
Redemptions of Ameren Illinois preferred stock	(13)	0
Employee payroll taxes related to stock-based compensation	(17)	(20)
Debt issuance costs	(13)	(10)
Other	(4)	0
Net cash provided by financing activities	1,290	608
Net change in cash, cash equivalents, and restricted cash	(34)	(13)
Cash, cash equivalents, and restricted cash at beginning of year	301	176
Cash, cash equivalents, and restricted cash at end of period	267	163
Union Electric Company
Cash Flows From Operating Activities:
Net income	160	144
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	343	300
Amortization of nuclear fuel	20	45
Amortization of debt issuance costs and premium/discounts	3	3
Deferred income taxes and investment tax credits, net	(2)	14
Allowance for equity funds used during construction	(10)	(8)
Other	6	6
Changes in assets and liabilities:
Receivables	(135)	(149)
Inventories	(8)	(32)
Accounts and wages payable	(172)	(175)
Taxes accrued	167	151
Regulatory assets and liabilities	(165)	(13)
Assets, other	(7)	15
Liabilities, other	19	(10)
Pension and other postretirement benefits	5	1
Net cash provided by operating activities	224	292
Cash Flows From Investing Activities:
Capital expenditures	(684)	(516)
Wind generation expenditures	(417)	0
Nuclear fuel expenditures	(4)	(56)
Purchases of securities – nuclear decommissioning trust fund	(203)	(153)
Sales and maturities of securities – nuclear decommissioning trust fund	208	121
Money pool advances, net	47	0
Net cash used in investing activities	(1,053)	(604)
Cash Flows From Financing Activities:
Dividends on preferred stock	(2)	(2)
Short-term debt, net	0	(155)
Money pool borrowings, net	0	65
Maturities of long-term debt	0	(85)
Issuances of long-term debt	524	465
Capital contributions from parent	183	0
Debt issuance costs	(4)	(4)
Net cash provided by financing activities	701	284
Net change in cash, cash equivalents, and restricted cash	(128)	(28)
Cash, cash equivalents, and restricted cash at beginning of year	145	39
Cash, cash equivalents, and restricted cash at end of period	17	11
Ameren Illinois Company
Cash Flows From Operating Activities:
Net income	236	205
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	231	214
Amortization of debt issuance costs and premium/discounts	6	6
Deferred income taxes and investment tax credits, net	84	40
Allowance for equity funds used during construction	(6)	(5)
Other	(1)	(5)
Changes in assets and liabilities:
Receivables	43	(13)
Inventories	3	13
Accounts and wages payable	(23)	(12)
Taxes accrued	36	(32)
Regulatory assets and liabilities	(273)	(65)
Assets, other	(46)	(15)
Liabilities, other	(2)	12
Pension and other postretirement benefits	(8)	(8)
Net cash provided by operating activities	286	340
Cash Flows From Investing Activities:
Capital expenditures	(646)	(661)
Money pool advances, net	(20)	0
Other	(2)	2
Net cash used in investing activities	(668)	(659)
Cash Flows From Financing Activities:
Dividends on preferred stock	(1)	(2)
Short-term debt, net	0	(12)
Money pool borrowings, net	(19)	0
Issuances of long-term debt	449	0
Capital contributions from parent	70	350
Redemption of preferred stock	(13)	0
Debt issuance costs	(5)	0
Other	(4)	0
Net cash provided by financing activities	477	336
Net change in cash, cash equivalents, and restricted cash	95	17
Cash, cash equivalents, and restricted cash at beginning of year	147	125
Cash, cash equivalents, and restricted cash at end of period	$ 242	$ 142