Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash Flows From Operating Activities:
Net income	$ 265	$ 253
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	350	324
Amortization of nuclear fuel	19	22
Amortization of debt issuance costs and premium/discounts	3	4
Deferred income taxes and investment tax credits, net	35	31
Allowance for equity funds used during construction	(9)	(8)
Stock-based compensation costs	8	4
Other	(6)	11
Changes in assets and liabilities:
Receivables	112	(117)
Inventories	37	72
Accounts and wages payable	(362)	(235)
Taxes accrued	50	47
Regulatory assets and liabilities	(40)	75
Assets, other	(14)	(10)
Liabilities, other	(6)	(39)
Pension and other postretirement benefits	(58)	(15)
Counterparty collateral, net	112	(31)
Net cash provided by operating activities	496	388
Cash Flows From Investing Activities:
Capital expenditures	(931)	(774)
Nuclear fuel expenditures	(20)	(16)
Purchases of securities – nuclear decommissioning trust fund	(29)	(97)
Sales and maturities of securities – nuclear decommissioning trust fund	17	92
Other	(1)	15
Net cash used in investing activities	(964)	(780)
Cash Flows From Financing Activities:
Dividends on common stock	(165)	(152)
Dividends paid to noncontrolling interest holders	(1)	(1)
Short-term debt, net	179	555
Issuances of long-term debt	499	0
Issuances of common stock	5	5
Employee payroll taxes related to stock-based compensation	(20)	(16)
Debt issuance costs	(5)	0
Other	(3)	0
Net cash provided by financing activities	489	391
Net change in cash, cash equivalents, and restricted cash	21	(1)
Cash, cash equivalents, and restricted cash at beginning of year	216	155
Cash, cash equivalents, and restricted cash at end of period	237	154
Union Electric Company
Cash Flows From Operating Activities:
Net income	29	51
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	205	189
Amortization of nuclear fuel	19	22
Amortization of debt issuance costs and premium/discounts	2	1
Deferred income taxes and investment tax credits, net	15	4
Allowance for equity funds used during construction	(4)	(4)
Other	(3)	0
Changes in assets and liabilities:
Receivables	74	7
Inventories	(41)	5
Accounts and wages payable	(238)	(201)
Taxes accrued	38	41
Regulatory assets and liabilities	14	(3)
Assets, other	2	10
Liabilities, other	(11)	(23)
Pension and other postretirement benefits	(21)	(4)
Counterparty collateral, net	73	(39)
Net cash provided by operating activities	153	56
Cash Flows From Investing Activities:
Capital expenditures	(481)	(414)
Nuclear fuel expenditures	(20)	(16)
Purchases of securities – nuclear decommissioning trust fund	(29)	(97)
Sales and maturities of securities – nuclear decommissioning trust fund	17	92
Other	0	18
Net cash used in investing activities	(513)	(417)
Cash Flows From Financing Activities:
Dividends on preferred stock	(1)	(1)
Short-term debt, net	(132)	363
Issuances of long-term debt	499	0
Debt issuance costs	(5)	0
Other	(3)	0
Net cash provided by financing activities	358	362
Net change in cash, cash equivalents, and restricted cash	(2)	1
Cash, cash equivalents, and restricted cash at beginning of year	13	8
Cash, cash equivalents, and restricted cash at end of period	11	9
Ameren Illinois Company
Cash Flows From Operating Activities:
Net income	198	169
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	133	124
Amortization of debt issuance costs and premium/discounts	1	3
Deferred income taxes and investment tax credits, net	37	27
Allowance for equity funds used during construction	(4)	(4)
Other	6	2
Changes in assets and liabilities:
Receivables	26	(126)
Inventories	78	67
Accounts and wages payable	(112)	(18)
Taxes accrued	25	32
Regulatory assets and liabilities	(52)	79
Assets, other	(8)	(18)
Liabilities, other	30	5
Pension and other postretirement benefits	(24)	(8)
Counterparty collateral, net	39	8
Net cash provided by operating activities	373	342
Cash Flows From Investing Activities:
Capital expenditures	(407)	(342)
Net cash used in investing activities	(407)	(342)
Cash Flows From Financing Activities:
Short-term debt, net	60	4
Net cash provided by financing activities	60	4
Net change in cash, cash equivalents, and restricted cash	26	4
Cash, cash equivalents, and restricted cash at beginning of year	191	133
Cash, cash equivalents, and restricted cash at end of period	$ 217	$ 137