Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash Flows From Operating Activities:
Net income	$ 262	$ 265
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	379	350
Amortization of nuclear fuel	18	19
Amortization of debt issuance costs and premium/discounts	5	3
Deferred income taxes and investment tax credits, net	44	35
Allowance for equity funds used during construction	(9)	(9)
Stock-based compensation costs	8	8
Other	16	(6)
Changes in assets and liabilities:
Receivables	52	112
Inventories	54	37
Accounts and wages payable	(284)	(362)
Taxes accrued	70	50
Regulatory assets and liabilities	(95)	(40)
Assets, other	9	(14)
Liabilities, other	11	(6)
Pension and other postretirement benefits	(56)	(58)
Counterparty collateral, net	8	112
Net cash provided by operating activities	492	496
Cash Flows From Investing Activities:
Capital expenditures	(890)	(931)
Nuclear fuel expenditures	(12)	(20)
Purchases of securities – nuclear decommissioning trust fund	(70)	(29)
Sales and maturities of securities – nuclear decommissioning trust fund	66	17
Other	0	(1)
Net cash used in investing activities	(906)	(964)
Cash Flows From Financing Activities:
Dividends on common stock	(178)	(165)
Dividends paid to noncontrolling interest holders	(1)	(1)
Short-term debt, net	332	179
Issuances of long-term debt	347	499
Issuances of common stock	10	5
Employee payroll taxes related to stock-based compensation	(8)	(20)
Debt issuance costs	(5)	(5)
Other	0	(3)
Net cash provided by financing activities	497	489
Net change in cash, cash equivalents, and restricted cash	83	21
Cash, cash equivalents, and restricted cash at beginning of year	272	216
Cash, cash equivalents, and restricted cash at end of period	355	237
Union Electric Company
Cash Flows From Operating Activities:
Net income	26	29
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	212	205
Amortization of nuclear fuel	18	19
Amortization of debt issuance costs and premium/discounts	2	2
Deferred income taxes and investment tax credits, net	27	15
Allowance for equity funds used during construction	(9)	(4)
Other	17	(3)
Changes in assets and liabilities:
Receivables	43	74
Inventories	9	(41)
Accounts and wages payable	(222)	(238)
Taxes accrued	92	38
Regulatory assets and liabilities	(24)	14
Assets, other	1	2
Liabilities, other	4	(11)
Pension and other postretirement benefits	(20)	(21)
Counterparty collateral, net	1	73
Net cash provided by operating activities	177	153
Cash Flows From Investing Activities:
Capital expenditures	(466)	(481)
Nuclear fuel expenditures	(12)	(20)
Purchases of securities – nuclear decommissioning trust fund	(70)	(29)
Sales and maturities of securities – nuclear decommissioning trust fund	66	17
Net cash used in investing activities	(482)	(513)
Cash Flows From Financing Activities:
Dividends on preferred stock	(1)	(1)
Short-term debt, net	274	(132)
Money pool borrowings, net	(306)	0
Issuances of long-term debt	347	499
Debt issuance costs	(3)	(5)
Other	0	(3)
Net cash provided by financing activities	311	358
Net change in cash, cash equivalents, and restricted cash	6	(2)
Cash, cash equivalents, and restricted cash at beginning of year	10	13
Cash, cash equivalents, and restricted cash at end of period	16	11
Ameren Illinois Company
Cash Flows From Operating Activities:
Net income	215	198
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	153	133
Amortization of debt issuance costs and premium/discounts	1	1
Deferred income taxes and investment tax credits, net	27	37
Allowance for equity funds used during construction	0	(4)
Other	5	6
Changes in assets and liabilities:
Receivables	1	26
Inventories	49	78
Accounts and wages payable	(31)	(112)
Taxes accrued	64	25
Regulatory assets and liabilities	(66)	(52)
Assets, other	6	(8)
Liabilities, other	6	30
Pension and other postretirement benefits	(22)	(24)
Counterparty collateral, net	7	39
Net cash provided by operating activities	415	373
Cash Flows From Investing Activities:
Capital expenditures	(373)	(407)
Other	1	0
Net cash used in investing activities	(372)	(407)
Cash Flows From Financing Activities:
Short-term debt, net	58	60
Money pool borrowings, net	(81)	0
Net cash provided by financing activities	(23)	60
Net change in cash, cash equivalents, and restricted cash	20	26
Cash, cash equivalents, and restricted cash at beginning of year	234	191
Cash, cash equivalents, and restricted cash at end of period	$ 254	$ 217