$AEE
AMEREN CORP Stock $aee

$aee Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000100291021000065 Filed on February 22, 2021

Income Statement

Concept	2019 Q4	2018
Revenue	$1.316B	$6.291B
YoY Change	-7.26%	1.9%
Cost Of Revenue	$211.0M	$955.0M
YoY Change	-15.6%	0.63%
Gross Profit	$1.105B	$5.336B
YoY Change	-5.47%	2.12%
Gross Profit Margin	83.97%	84.82%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$257.0M	$938.0M
YoY Change	7.53%	7.08%
% of Gross Profit	23.26%	17.58%
Operating Expenses	$926.0M	$4.934B
YoY Change	-7.68%	3.57%
Operating Profit	$179.0M	$1.357B
YoY Change	7.83%	-3.76%
Interest Expense	-$83.00M	$401.0M
YoY Change	7.79%	2.56%
% of Operating Profit	-46.37%	29.55%
Other Income/Expense, Net	$23.00M	$102.0M
YoY Change	-675.0%	18.6%
Pretax Income	$119.0M	$1.058B
YoY Change	40.0%	-4.25%
Income Tax	$24.00M	$237.0M
% Of Pretax Income	20.17%	22.4%
Net Earnings	$95.00M	$821.0M
YoY Change	37.68%	56.98%
Net Earnings / Revenue	7.22%	13.05%
Basic Earnings Per Share	$0.38	$3.34
Diluted Earnings Per Share	$0.38	$3.32
COMMON SHARES
Basic Shares Outstanding	246.0M shares	243.8M shares
Diluted Shares Outstanding		245.8M shares

Balance Sheet

Concept	2019 Q4	2018
SHORT-TERM ASSETS
Cash & Short-Term Investments	$16.00M	$16.00M
YoY Change	0.0%	60.0%
Cash & Equivalents	$16.00M	$16.00M
Short-Term Investments
Other Short-Term Assets	$118.0M	$492.0M
YoY Change	87.3%	-12.92%
Inventory	$494.0M	$483.0M
Prepaid Expenses
Receivables	$393.0M	$463.0M
Other Receivables	$63.00M	$79.00M
Total Short-Term Assets	$1.431B	$1.533B
YoY Change	-6.65%	-4.9%
LONG-TERM ASSETS
Property, Plant & Equipment	$24.38B	$22.81B
YoY Change	6.87%	6.26%
Goodwill	$411.0M
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments	$847.0M	$684.0M
YoY Change	23.83%	-2.84%
Other Assets	$876.0M	$1.777B
YoY Change	34.77%	1.43%
Total Long-Term Assets	$27.50B	$25.68B
YoY Change	7.09%	5.54%
TOTAL ASSETS
Total Short-Term Assets	$1.431B	$1.533B
Total Long-Term Assets	$27.50B	$25.68B
Total Assets	$28.93B	$27.22B
YoY Change	6.31%	4.89%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$874.0M	$817.0M
YoY Change	6.98%	-9.42%
Accrued Expenses	$7.000M	$93.00M
YoY Change	-92.47%	-6.06%
Deferred Revenue	$111.0M
YoY Change	-4.31%
Short-Term Debt	$440.0M	$597.0M
YoY Change	-26.3%	23.35%
Long-Term Debt Due	$442.0M	$580.0M
YoY Change	-23.79%	-31.03%
Total Short-Term Liabilities	$2.505B	$2.687B
YoY Change	-6.77%	-8.61%
LONG-TERM LIABILITIES
Long-Term Debt	$8.915B	$7.859B
YoY Change	13.44%	10.78%
Other Long-Term Liabilities	$467.0M	$6.230B
YoY Change	14.46%	3.32%
Total Long-Term Liabilities	$9.382B	$14.09B
YoY Change	13.49%	7.35%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.505B	$2.687B
Total Long-Term Liabilities	$9.382B	$14.09B
Total Liabilities	$11.89B	$19.58B
YoY Change	8.52%	4.39%
SHAREHOLDERS EQUITY
Retained Earnings	$2.380B
YoY Change	17.59%
Common Stock	$2.000M
YoY Change	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$8.059B	$7.631B
YoY Change
Total Liabilities & Shareholders Equity	$28.93B	$27.22B
YoY Change	6.31%	4.89%

Cashflow Statement

Concept	2019 Q4	2018
OPERATING ACTIVITIES
Net Income	$95.00M	$821.0M
YoY Change	37.68%	56.98%
Depreciation, Depletion And Amortization	$257.0M	$938.0M
YoY Change	7.53%	7.08%
Cash From Operating Activities	$502.0M	$2.170B
YoY Change	3.72%	2.46%
INVESTING ACTIVITIES
Capital Expenditures	-$655.0M	$2.286B
YoY Change	5.82%	7.22%
Acquisitions
YoY Change
Other Investing Activities	$18.00M	-$18.00M
YoY Change	800.0%	157.14%
Cash From Investing Activities	-$637.0M	-$2.336B
YoY Change	3.24%	5.99%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		-$74.00M
YoY Change		-408.33%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	156.0M	$205.0M
YoY Change	5.41%	100.98%
NET CHANGE
Cash From Operating Activities	502.0M	$2.170B
Cash From Investing Activities	-637.0M	-$2.336B
Cash From Financing Activities	156.0M	$205.0M
Net Change In Cash	21.00M	$39.00M
YoY Change	40.0%	143.75%
FREE CASH FLOW
Cash From Operating Activities	$502.0M	$2.170B
Capital Expenditures	-$655.0M	$2.286B
Free Cash Flow	$1.157B	-$116.0M
YoY Change	4.9%	728.57%

Facts In Submission

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CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
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CY2020	aee	Number Of Additional Weeks After Initial Indemnity Coverage For Power Outage NumberOfAdditionalWeeksAfterInitialIndemnityCoverageForPowerOutage	1.365
CY2020	dei	Document Type DocumentType	10-K
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CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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CY2020	dei	Entity File Number EntityFileNumber	1-14756
CY2020	dei	Entity Registrant Name EntityRegistrantName	Ameren Corporation
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	43-1723446
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MO
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CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	MO
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CY2020	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value per share
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CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	8059000000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	142000000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	142000000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9080000000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8201000000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	32030000000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	28933000000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	877000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	834000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	821000000	USD
CY2020	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1085000000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1002000000	USD
CY2018	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	938000000	USD
CY2020	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	68000000	USD
CY2019	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	79000000	USD
CY2018	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	95000000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	22000000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	19000000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	20000000	USD
CY2020	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	148000000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	167000000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	224000000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	32000000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	28000000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	36000000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	21000000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	20000000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	20000000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-22000000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	14000000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-44000000	USD
CY2020	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	47000000	USD
CY2019	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-79000000	USD
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	24000000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	25000000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	10000000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-39000000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	40000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-3000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-22000000	USD
CY2020	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	34000000	USD
CY2019	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-8000000	USD
CY2018	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-10000000	USD
CY2020	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	254000000	USD
CY2019	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-164000000	USD
CY2018	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-201000000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	83000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	59000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2000000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-111000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-33000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-117000000	USD
CY2020	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-38000000	USD
CY2019	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-39000000	USD
CY2018	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-25000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1727000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2170000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2170000000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2669000000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2411000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2286000000	USD
CY2020	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	564000000	USD
CY2019	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	0	USD
CY2018	us-gaap	Payments To Acquire Projects PaymentsToAcquireProjects	0	USD
CY2020	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	66000000	USD
CY2019	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	31000000	USD
CY2018	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	52000000	USD
CY2020	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	224000000	USD
CY2019	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	256000000	USD
CY2018	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	315000000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	183000000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	260000000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	299000000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	0	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	207000000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	0	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	207000000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-11000000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-3000000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-18000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3329000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2435000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2336000000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	494000000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	472000000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	451000000	USD
CY2020	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	6000000	USD
CY2019	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	6000000	USD
CY2018	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	6000000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	50000000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-157000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	112000000	USD
CY2020	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	442000000	USD
CY2019	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	580000000	USD
CY2018	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	841000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2183000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1527000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1352000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	476000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	68000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	74000000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	20000000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	29000000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	19000000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	20000000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	17000000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	14000000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1727000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	334000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	205000000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	125000000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	69000000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	39000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	176000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	107000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	68000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	301000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	176000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	107000000	USD
CY2020	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	16000000	USD
CY2019	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	20000000	USD
CY2018	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	21000000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	383000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	367000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	387000000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	13000000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	13000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	21000000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9080000000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8201000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7773000000	USD
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	246200000	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	244500000	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	242600000	shares
CY2020Q4	aee	Common Stock Shares Issued Through Forward Sale Agreement CommonStockSharesIssuedThroughForwardSaleAgreement	5900000	shares
CY2019Q4	aee	Common Stock Shares Issued Through Forward Sale Agreement CommonStockSharesIssuedThroughForwardSaleAgreement	0	shares
CY2018Q4	aee	Common Stock Shares Issued Through Forward Sale Agreement CommonStockSharesIssuedThroughForwardSaleAgreement	0	shares
CY2020	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	700000	shares
CY2019	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	900000	shares
CY2018	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	1200000	shares
CY2020	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	500000	shares
CY2019	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	800000	shares
CY2018	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	700000	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	253300000	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	246200000	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	244500000	shares
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	2.0000
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.9200
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.8475
CY2020	us-gaap	Nature Of Operations NatureOfOperations	<div style="margin-top:10pt"><span style="color:#000000;font-family:'Arial Narrow',sans-serif;font-size:10pt;font-weight:700;line-height:120%">General</span></div><div style="margin-top:10pt;text-indent:18pt"><span style="color:#000000;font-family:'Arial Narrow',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Ameren, headquartered in St. Louis, Missouri, is a public utility holding company whose primary assets are its equity interests in its subsidiaries.</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span><span style="color:#000000;font-family:'Arial Narrow',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Ameren’s subsidiaries are separate, independent legal entities with separate businesses, assets, and liabilities. Dividends on Ameren’s common stock and the payment of expenses by Ameren depend on distributions made to it by its subsidiaries. Ameren’s principal subsidiaries are listed below. Ameren also has other subsidiaries that conduct other activities, such as providing shared services.</span></div><div style="margin-top:10pt;padding-left:18pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial Narrow',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Arial Narrow',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:15.13pt">Union Electric Company, doing business as Ameren Missouri, operates a rate-regulated electric generation, transmission, and distribution business and a rate-regulated natural gas distribution business in Missouri. Ameren Missouri was incorporated in Missouri in 1922 and is successor to a number of companies, the oldest of which was organized in 1881. It is the largest electric utility in the state of Missouri. It supplies electric and natural gas service to a 24,000-square-mile area in central and eastern Missouri, which includes the Greater St. Louis area. Ameren Missouri supplies electric service to 1.2 million customers and natural gas service to 0.1 million customers.</span></div><div style="padding-left:18pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial Narrow',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Arial Narrow',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:15.13pt">Ameren Illinois Company, doing business as Ameren Illinois, operates rate-regulated electric transmission, electric distribution, and natural gas distribution businesses in Illinois. Ameren Illinois was incorporated in Illinois in 1923 and is the successor to a number of companies, the oldest of which was organized in 1902. Ameren Illinois supplies electric and natural gas utility service to a 43,700 square mile area in central and southern Illinois. Ameren Illinois supplies electric service to 1.2 million customers and natural gas service to 0.8 million customers.</span></div><div style="padding-left:18pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial Narrow',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Arial Narrow',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:15.13pt">Ameren Transmission Company of Illinois, doing business as ATXI, operates a FERC rate-regulated electric transmission business in the MISO. ATXI was incorporated in Illinois in 2006. In December 2020, ATXI completed construction of the ninth and final line segment of the Illinois Rivers transmission line, a MISO-approved electric transmission line. ATXI also operates the Spoon River and Mark Twain transmission lines, which were placed in service in February 2018 and December 2019, respectively.</span></div>
CY2020Q1	aee	Workforce Utilizing Remote Work Arrangement WorkforceUtilizingRemoteWorkArrangement	0.65
CY2020Q4	aee	Workforce Utilizing Remote Work Arrangement WorkforceUtilizingRemoteWorkArrangement	0.50
CY2020Q4	aee	Percentage Of Accounts Receivable Balances That Are30 Days Past Due Or Are Part Of A Deferred Payment Arrangement PercentageOfAccountsReceivableBalancesThatAre30DaysPastDueOrArePartOfADeferredPaymentArrangement	0.29
CY2020Q4	aee	Accounts Receivable Balances That Are30 Days Or More Past Due Or Part Of A Deferred Payment Arrangement AccountsReceivableBalancesThatAre30DaysOrMorePastDueOrPartOfADeferredPaymentArrangement	133000000	USD
CY2019Q4	aee	Percentage Of Accounts Receivable Balances That Are30 Days Past Due Or Are Part Of A Deferred Payment Arrangement PercentageOfAccountsReceivableBalancesThatAre30DaysPastDueOrArePartOfADeferredPaymentArrangement	0.18
CY2019Q4	aee	Accounts Receivable Balances That Are30 Days Or More Past Due Or Part Of A Deferred Payment Arrangement AccountsReceivableBalancesThatAre30DaysOrMorePastDueOrPartOfADeferredPaymentArrangement	75000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	411000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	411000000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	4	segment
CY2020Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	USD
CY2020Q4	us-gaap	Noncontrolling Interest In Variable Interest Entity NoncontrollingInterestInVariableInterestEntity	37000000	USD
CY2019Q4	us-gaap	Noncontrolling Interest In Variable Interest Entity NoncontrollingInterestInVariableInterestEntity	28000000	USD
CY2020Q4	us-gaap	Noncontrolling Interest In Variable Interest Entity NoncontrollingInterestInVariableInterestEntity	37000000	USD
CY2020Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	272000000	USD
CY2019Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	264000000	USD
CY2020	aee	Miso Resettlements MISOResettlements	0	USD
CY2020	aee	Lower Revenue Due To Transmission Formula Rate Revisions LowerRevenueDueToTransmissionFormulaRateRevisions	2000000	USD
CY2020	aee	Income Recognized Due To Higher Ferc Allowed Base Roe IncomeRecognizedDueToHigherFERCAllowedBaseROE	13000000	USD
CY2020Q4	us-gaap	Regulatory Assets RegulatoryAssets	1209000000	USD
CY2019Q4	us-gaap	Regulatory Assets RegulatoryAssets	1061000000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	109000000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	69000000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1100000000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	992000000	USD
CY2020Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	5403000000	USD
CY2019Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	5051000000	USD
CY2020Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	121000000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	164000000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	5282000000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	4887000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	39719000000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	13773000000	USD
CY2020Q4	aee	Property Plant And Equipment Net Before Construction Work In Progress PropertyPlantAndEquipmentNetBeforeConstructionWorkInProgress	25946000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	26807000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	36652000000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	13006000000	USD
CY2019Q4	aee	Property Plant And Equipment Net Before Construction Work In Progress PropertyPlantAndEquipmentNetBeforeConstructionWorkInProgress	23646000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	24376000000	USD
CY2020Q4	aee	Numberof Combustion Turbine Electric Generation Equipmentwith Related Financing Obligations NumberofCombustionTurbineElectricGenerationEquipmentwithRelatedFinancingObligations	2	equipment
CY2020Q4	aee	Gross Asset Value Financing Obligation GrossAssetValueFinancingObligation	240000000	USD
CY2019Q4	aee	Gross Asset Value Financing Obligation GrossAssetValueFinancingObligation	236000000	USD
CY2020Q4	aee	Property Plantand Equipment Numberof Financing Obligations PropertyPlantandEquipmentNumberofFinancingObligations	2	equipment
CY2020Q4	aee	Accumulateddepreciationfinancingobligations Accumulateddepreciationfinancingobligations	99000000	USD
CY2019Q4	aee	Accumulateddepreciationfinancingobligations Accumulateddepreciationfinancingobligations	95000000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	8915000000	USD
CY2020	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	263000000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	490000000	USD
CY2020Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0131
CY2020	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	908000000	USD
CY2020	aee	Peak Short Term Borrowings Interest Rate PeakShortTermBorrowingsInterestRate	0.0505
CY2019	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	700000000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	440000000	USD
CY2019Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0260
CY2019	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	1113000000	USD
CY2019	aee	Peak Short Term Borrowings Interest Rate PeakShortTermBorrowingsInterestRate	0.0500
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	11078000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	8000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	505000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	240000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	850000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	300000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	9287000000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	11190000000	USD
CY2020Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	105.50
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2020	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	700000	shares
CY2019	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	900000	shares
CY2018	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	1200000	shares
CY2020	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	500000	shares
CY2019	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	800000	shares
CY2018	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	700000	shares
CY2020	us-gaap	Stock Issued1 StockIssued1	38000000	USD
CY2019	us-gaap	Stock Issued1 StockIssued1	54000000	USD
CY2018	us-gaap	Stock Issued1 StockIssued1	35000000	USD
CY2020Q4	aee	Common Stock Shares Authorized Under Dr Plus Plan CommonStockSharesAuthorizedUnderDRPlusPlan	4000000	shares
CY2020Q4	aee	Common Stock Shares Authorized Under401k Plan CommonStockSharesAuthorizedUnder401kPlan	4000000	shares
CY2019Q3	us-gaap	Forward Contract Indexed To Issuers Equity Indexed Shares ForwardContractIndexedToIssuersEquityIndexedShares	7500000	shares
CY2020Q4	aee	Common Stock Shares Issued Through Forward Sale Agreement CommonStockSharesIssuedThroughForwardSaleAgreement	5900000	shares
CY2020Q4	aee	Common Stock Value Issued Through Forward Sale Agreement CommonStockValueIssuedThroughForwardSaleAgreement	425000000	USD
CY2020	aee	Debt Default Provision Excess DebtDefaultProvisionExcess	25000000	USD
CY2020	aee	Debt Default Provision Excess DebtDefaultProvisionExcess	25000000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	32000000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	28000000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	36000000	USD
CY2020	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	25000000	USD
CY2019	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	25000000	USD
CY2018	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	26000000	USD
CY2020	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	4000000	USD
CY2019	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	8000000	USD
CY2018	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	7000000	USD
CY2020	aee	Defined Benefit Plan Nonservice Costor Income Components DefinedBenefitPlanNonserviceCostorIncomeComponents	116000000	USD
CY2019	aee	Defined Benefit Plan Nonservice Costor Income Components DefinedBenefitPlanNonserviceCostorIncomeComponents	90000000	USD
CY2018	aee	Defined Benefit Plan Nonservice Costor Income Components DefinedBenefitPlanNonserviceCostorIncomeComponents	70000000	USD
CY2020	us-gaap	Other Income OtherIncome	13000000	USD
CY2019	us-gaap	Other Income OtherIncome	6000000	USD
CY2018	us-gaap	Other Income OtherIncome	8000000	USD
CY2020	aee	Donations Donations	25000000	USD
CY2019	aee	Donations Donations	12000000	USD
CY2018	aee	Donations Donations	33000000	USD
CY2020	us-gaap	Other Noninterest Expense OtherNoninterestExpense	14000000	USD
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	15000000	USD
CY2018	us-gaap	Other Noninterest Expense OtherNoninterestExpense	12000000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	151000000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	130000000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	102000000	USD
CY2020Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	977000000	USD
CY2019Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	842000000	USD
CY2020Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	977000000	USD
CY2019Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	842000000	USD
CY2020Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	999000000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	868000000	USD
CY2020Q4	aee	Receivables Payables And Accrued Income Net ReceivablesPayablesAndAccruedIncomeNet	5000000	USD
CY2019Q4	aee	Receivables Payables And Accrued Income Net ReceivablesPayablesAndAccruedIncomeNet	5000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	120000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	123000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	69000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	75000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	83000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	99000000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	272000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	297000000	USD
CY2020	aee	Number Of Years The Limit Of Liability And The Maximum Potential Annual Payments Are Adjusted NumberOfYearsTheLimitOfLiabilityAndTheMaximumPotentialAnnualPaymentsAreAdjusted	five years
CY2020Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	249000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	216000000	USD
CY2020Q4	aee	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Changein Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationChangeinDiscountRate	0.0075
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	249000000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	216000000	USD
CY2020	aee	Defined Benefit Plan Number Of High Quality Bonds Used To Determine Yield Curve DefinedBenefitPlanNumberOfHighQualityBondsUsedToDetermineYieldCurve	830	bond
CY2020Q4	aee	Defined Benefit Plan Estimated Future Employer Contributions Over Next Five Years DefinedBenefitPlanEstimatedFutureEmployerContributionsOverNextFiveYears	60000000	USD
CY2020Q4	aee	Collateralized Loan Percentage Compared To Assets Market Value CollateralizedLoanPercentageComparedToAssetsMarketValue	1.02
CY2020Q4	us-gaap	Securities Loaned SecuritiesLoaned	365000000	USD
CY2019Q4	us-gaap	Securities Loaned SecuritiesLoaned	246000000	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	38000000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	35000000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	33000000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	8000000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2300000	shares
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	21000000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20000000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	5000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6000000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	15000000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	15000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	14000000	USD
CY2020	aee	Settledperformanceshareunitsandrestrictedstockunits Settledperformanceshareunitsandrestrictedstockunits	58000000	USD
CY2019	aee	Settledperformanceshareunitsandrestrictedstockunits Settledperformanceshareunitsandrestrictedstockunits	83000000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018	aee	Settledperformanceshareunitsandrestrictedstockunits Settledperformanceshareunitsandrestrictedstockunits	54000000	USD
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	34000000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P22M
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2020	aee	Effective Income Tax Rate Reconciliation Nondeductible Expense Amortizationof Excess Deferred Taxes Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAmortizationofExcessDeferredTaxesPercent	-0.09
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.01
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.05
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	0.01
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.15
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2019	aee	Effective Income Tax Rate Reconciliation Nondeductible Expense Amortizationof Excess Deferred Taxes Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAmortizationofExcessDeferredTaxesPercent	-0.07
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.01
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.06
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	0.01
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.18
CY2018	aee	Effective Income Tax Rate Reconciliation Nondeductible Expense Amortizationof Excess Deferred Taxes Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAmortizationofExcessDeferredTaxesPercent	-0.04
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.01
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.06
CY2018	aee	Effective Income Tax Rate Reconciliation Tax Cut And Jobs Act EffectiveIncomeTaxRateReconciliationTaxCutAndJobsAct	0.01
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.01
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.22
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2000000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5000000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	187000000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	57000000	USD
CY2020	aee	Amortizationof Excess Deferred Taxes AmortizationofExcessDeferredTaxes	91000000	USD
CY2020	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-5000000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	155000000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-4000000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	19000000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	185000000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	59000000	USD
CY2019	aee	Amortizationof Excess Deferred Taxes AmortizationofExcessDeferredTaxes	72000000	USD
CY2019	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-5000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	182000000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-10000000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	23000000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	220000000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	49000000	USD
CY2018	aee	Amortizationof Excess Deferred Taxes AmortizationofExcessDeferredTaxes	40000000	USD
CY2018	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-5000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	237000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3876000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	515000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	104000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	97000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	17000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3177000000	USD
CY2020Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	34000000	USD
CY2020Q4	us-gaap	Deferred Income Taxes And Other Tax Liabilities Noncurrent DeferredIncomeTaxesAndOtherTaxLiabilitiesNoncurrent	3211000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3616000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	548000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	111000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	98000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	21000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2880000000	USD
CY2019Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	39000000	USD
CY2019Q4	us-gaap	Deferred Income Taxes And Other Tax Liabilities Noncurrent DeferredIncomeTaxesAndOtherTaxLiabilitiesNoncurrent	2919000000	USD
CY2020Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	7000000	USD
CY2020Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	90000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	3000000	USD
CY2020Q4	aee	Deferred Tax Assets Charitable Contribution Carryforwards Valuation Allowance DeferredTaxAssetsCharitableContributionCarryforwardsValuationAllowance	3000000	USD
CY2020Q4	aee	Deferred Tax Assets Charitable Contribution Carryforwards Net Of Valuation Allowance DeferredTaxAssetsCharitableContributionCarryforwardsNetOfValuationAllowance	0	USD
CY2019Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	98000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	3000000	USD
CY2019Q4	aee	Deferred Tax Assets Charitable Contribution Carryforwards Valuation Allowance DeferredTaxAssetsCharitableContributionCarryforwardsValuationAllowance	3000000	USD
CY2019Q4	aee	Deferred Tax Assets Charitable Contribution Carryforwards Net Of Valuation Allowance DeferredTaxAssetsCharitableContributionCarryforwardsNetOfValuationAllowance	0	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	788000000	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	413000000	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	284000000	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	186000000	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	103000000	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	195000000	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	1969000000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	139000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	16000000	USD
CY2020Q4	aee	Payablesforpurchasedreceivables Payablesforpurchasedreceivables	28000000	USD
CY2019Q4	aee	Payablesforpurchasedreceivables Payablesforpurchasedreceivables	32000000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	17000000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	17000000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	14000000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	141000000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	120000000	USD
CY2020Q4	aee	Restricted Cashand Cash Equivalents Nuclear Decommissioning Trust Fund RestrictedCashandCashEquivalentsNuclearDecommissioningTrustFund	4000000	USD
CY2019Q4	aee	Restricted Cashand Cash Equivalents Nuclear Decommissioning Trust Fund RestrictedCashandCashEquivalentsNuclearDecommissioningTrustFund	26000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	301000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	176000000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	18000000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	48000000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	30000000	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	15000000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	16000000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	20000000	USD
CY2019Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	126000000	USD
CY2020Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	57000000	USD
CY2019Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	63000000	USD
CY2019	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	31000000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	50000000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	17000000	USD
CY2020Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	115000000	USD
CY2020Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	349000000	USD
CY2019Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	305000000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	521000000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	494000000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	33000000	USD
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	57000000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	691000000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	650000000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	36000000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	58000000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	20000000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	30000000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	28000000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	756000000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	691000000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	60000000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	53000000	USD
CY2020Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	90000000	USD
CY2018	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	282000000	USD
CY2019Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	86000000	USD
CY2020	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	254000000	USD
CY2019	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	264000000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	32000000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	28000000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	36000000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	21000000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	48000000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	48000000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	57000000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	247000000.0	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	245600000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	243800000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1200000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1400000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2000000.0	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	500000	shares
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	272000000	USD
CY2019	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	100000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	248700000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	247100000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	245800000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	400000000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	333000000	USD
CY2020	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	116000000	USD
CY2019	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	143000000	USD
CY2018	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-38000000	USD
CY2020	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	0	USD
CY2019	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	17000000	USD
CY2018	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	0	USD
CY2020	us-gaap	Stock Issued1 StockIssued1	38000000	USD
CY2019	us-gaap	Stock Issued1 StockIssued1	54000000	USD
CY2018	us-gaap	Stock Issued1 StockIssued1	35000000	USD
CY2020	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	0	USD
CY2019	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	17000000	USD
CY2018	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	0	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	4	segment
CY2020	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	1075000000	USD
CY2020	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	29000000	USD
CY2020	us-gaap	Interest Expense InterestExpense	419000000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	155000000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	871000000	USD
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	3233000000	USD
CY2019	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	995000000	USD
CY2019	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	33000000	USD
CY2019	us-gaap	Interest Expense InterestExpense	381000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	182000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	828000000	USD
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2411000000	USD
CY2018	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	955000000	USD
CY2018	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	33000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	401000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	237000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	815000000	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2286000000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5794000000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	5910000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	6291000000	USD
CY2020	aee	Revenuesfromalternativerevenueprograms Revenuesfromalternativerevenueprograms	36000000	USD
CY2020	aee	Otherrevenuesnotfromcontractswithcustomers Otherrevenuesnotfromcontractswithcustomers	36000000	USD
CY2019	aee	Revenuesfromalternativerevenueprograms Revenuesfromalternativerevenueprograms	-70000000	USD
CY2019	aee	Otherrevenuesnotfromcontractswithcustomers Otherrevenuesnotfromcontractswithcustomers	28000000	USD
CY2018	aee	Revenuesfromalternativerevenueprograms Revenuesfromalternativerevenueprograms	-59000000	USD
CY2018	aee	Otherrevenuesnotfromcontractswithcustomers Otherrevenuesnotfromcontractswithcustomers	42000000	USD

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$AEE
AMEREN CORP Stock $aee

2019 Q4 Form 10-K Financial Statement

#000100291021000065 Filed on February 22, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AEE AMEREN CORP Stock $aee

2019 Q4 Form 10-K Financial Statement

#000100291021000065 Filed on February 22, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AEE
AMEREN CORP Stock $aee