Consolidated Statement of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash Flows From Operating Activities:
Net income	$ 462	$ 443
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	665	596
Amortization of nuclear fuel	28	20
Amortization of debt issuance costs and premium/discounts	12	11
Deferred income taxes and investment tax credits, net	66	59
Allowance for equity funds used during construction	(19)	(16)
Stock-based compensation costs	12	11
Other	33	2
Changes in assets and liabilities:
Receivables	(187)	(92)
Inventories	(8)	(5)
Accounts and wages payable	(87)	(208)
Taxes accrued	94	104
Regulatory assets and liabilities	(74)	(441)
Assets, other	(35)	(36)
Liabilities, other	45	13
Pension and other postretirement benefits	(32)	1
Counterparty collateral, net	(103)	(26)
Net cash provided by operating activities	872	436
Cash Flows From Investing Activities:
Capital expenditures	(1,538)	(1,763)
Nuclear fuel expenditures	(22)	(4)
Purchases of securities – nuclear decommissioning trust fund	(122)	(203)
Sales and maturities of securities – nuclear decommissioning trust fund	114	208
Other	16	2
Net cash used in investing activities	(1,552)	(1,760)
Cash Flows From Financing Activities:
Dividends on common stock	(305)	(282)
Dividends paid to noncontrolling interest holders	(3)	(3)
Short-term debt, net	475	(59)
Issuances of long-term debt	524	1,423
Issuances of common stock	17	258
Redemptions of Ameren Illinois preferred stock	0	(13)
Employee payroll taxes related to stock-based compensation	(16)	(17)
Debt issuance costs	(6)	(13)
Other	0	(4)
Net cash provided by financing activities	686	1,290
Net change in cash, cash equivalents, and restricted cash	6	(34)
Cash, cash equivalents, and restricted cash at beginning of year	155	301
Cash, cash equivalents, and restricted cash at end of period	161	267
Union Electric Company
Cash Flows From Operating Activities:
Net income	152	160
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	393	343
Amortization of nuclear fuel	28	20
Amortization of debt issuance costs and premium/discounts	3	3
Deferred income taxes and investment tax credits, net	19	(2)
Allowance for equity funds used during construction	(10)	(10)
Other	4	6
Changes in assets and liabilities:
Receivables	(105)	(135)
Inventories	(7)	(8)
Accounts and wages payable	(159)	(172)
Taxes accrued	81	167
Regulatory assets and liabilities	(128)	(165)
Assets, other	12	23
Liabilities, other	24	19
Pension and other postretirement benefits	(8)	5
Counterparty collateral, net	(118)	(30)
Net cash provided by operating activities	181	224
Cash Flows From Investing Activities:
Capital expenditures	(806)	(1,101)
Nuclear fuel expenditures	(22)	(4)
Purchases of securities – nuclear decommissioning trust fund	(122)	(203)
Sales and maturities of securities – nuclear decommissioning trust fund	114	208
Proceeds from Collection of Advance to Affiliate	0	47
Other	18	0
Net cash used in investing activities	(818)	(1,053)
Cash Flows From Financing Activities:
Dividends on preferred stock	(2)	(2)
Short-term debt, net	120	0
Issuances of long-term debt	524	524
Capital contributions from parent	0	183
Debt issuance costs	(6)	(4)
Net cash provided by financing activities	636	701
Net change in cash, cash equivalents, and restricted cash	(1)	(128)
Cash, cash equivalents, and restricted cash at beginning of year	8	145
Cash, cash equivalents, and restricted cash at end of period	7	17
Ameren Illinois Company
Cash Flows From Operating Activities:
Net income	273	236
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	251	231
Amortization of debt issuance costs and premium/discounts	6	6
Deferred income taxes and investment tax credits, net	55	84
Allowance for equity funds used during construction	(9)	(6)
Other	6	5
Changes in assets and liabilities:
Receivables	(76)	43
Inventories	(1)	3
Accounts and wages payable	76	(23)
Taxes accrued	62	36
Regulatory assets and liabilities	55	(273)
Assets, other	(66)	(46)
Liabilities, other	61	(2)
Pension and other postretirement benefits	(18)	(8)
Net cash provided by operating activities	675	286
Cash Flows From Investing Activities:
Capital expenditures	(699)	(646)
Payments for Advance to Affiliate	0	(20)
Other	0	(2)
Net cash used in investing activities	(699)	(668)
Cash Flows From Financing Activities:
Dividends on preferred stock	(1)	(1)
Short-term debt, net	38	0
Money pool borrowings, net	0	(19)
Issuances of long-term debt	0	449
Capital contributions from parent	0	70
Redemption of preferred stock	0	(13)
Debt issuance costs	0	(5)
Other	0	(4)
Net cash provided by financing activities	37	477
Net change in cash, cash equivalents, and restricted cash	13	95
Cash, cash equivalents, and restricted cash at beginning of year	133	147
Cash, cash equivalents, and restricted cash at end of period	$ 146	$ 242