$AEE
AMEREN CORP Stock $aee

$aee Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000100291020000077 Filed on February 28, 2020

Income Statement

Concept	2019 Q4	2019 Q1	2019
Revenue	$1.316B	$1.556B	$5.910B
YoY Change	-7.26%	-1.83%	-6.06%
Cost Of Revenue	$211.0M	$317.0M	$887.0M
YoY Change	-15.6%	-5.09%	-7.12%
Gross Profit	$1.105B	$1.239B	$5.023B
YoY Change	-5.47%	-0.96%	-5.87%
Gross Profit Margin	83.97%	79.63%	84.99%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$257.0M	$245.0M	$1.002B
YoY Change	7.53%	6.52%	6.82%
% of Gross Profit	23.26%	19.77%	19.95%
Operating Expenses	$926.0M	$1.268B	$4.643B
YoY Change	-7.68%	-3.35%	-5.9%
Operating Profit	$179.0M	$288.0M	$1.267B
YoY Change	7.83%	5.49%	-6.63%
Interest Expense	-$83.00M	$97.00M	$381.0M
YoY Change	7.79%	-3.96%	-4.99%
% of Operating Profit	-46.37%	33.68%	30.07%
Other Income/Expense, Net	$23.00M	$29.00M	$130.0M
YoY Change	-675.0%	26.09%	27.45%
Pretax Income	$119.0M	$220.0M	$1.016B
YoY Change	40.0%	12.82%	-3.97%
Income Tax	$24.00M	$27.00M	$182.0M
% Of Pretax Income	20.17%	12.27%	17.91%
Net Earnings	$95.00M	$193.0M	$834.0M
YoY Change	37.68%	26.14%	1.58%
Net Earnings / Revenue	7.22%	12.4%	14.11%
Basic Earnings Per Share	$0.38	$0.78	$3.37
Diluted Earnings Per Share	$0.38	$0.78	$3.35
COMMON SHARES
Basic Shares Outstanding	246.0M shares	244.9M shares	245.6M shares
Diluted Shares Outstanding		246.4M shares	247.1M shares

Balance Sheet

Concept	2019 Q4	2019 Q1	2019
SHORT-TERM ASSETS
Cash & Short-Term Investments	$16.00M	$8.000M	$16.00M
YoY Change	0.0%	-73.33%	0.0%
Cash & Equivalents	$16.00M	$8.000M	$16.00M
Short-Term Investments
Other Short-Term Assets	$118.0M	$70.00M	$465.0M
YoY Change	87.3%	-16.67%	-5.49%
Inventory	$494.0M	$402.0M	$494.0M
Prepaid Expenses
Receivables	$393.0M	$517.0M	$393.0M
Other Receivables	$63.00M	$74.00M	$63.00M
Total Short-Term Assets	$1.431B	$1.422B	$1.431B
YoY Change	-6.65%	-9.25%	-6.65%
LONG-TERM ASSETS
Property, Plant & Equipment	$24.38B	$23.04B	$24.41B
YoY Change	6.87%	6.36%	7.02%
Goodwill	$411.0M	$411.0M
YoY Change	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$847.0M	$754.0M	$847.0M
YoY Change	23.83%	8.02%	23.83%
Other Assets	$876.0M	$744.0M	$1.832B
YoY Change	34.77%	39.85%	3.1%
Total Long-Term Assets	$27.50B	$26.09B	$27.50B
YoY Change	7.09%	6.43%	7.09%
TOTAL ASSETS
Total Short-Term Assets	$1.431B	$1.422B	$1.431B
Total Long-Term Assets	$27.50B	$26.09B	$27.50B
Total Assets	$28.93B	$27.51B	$28.93B
YoY Change	6.31%	5.48%	6.31%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$874.0M	$522.0M	$874.0M
YoY Change	6.98%	5.03%	6.98%
Accrued Expenses	$7.000M	$88.00M	$7.000M
YoY Change	-92.47%	-9.28%	-92.47%
Deferred Revenue	$111.0M	$111.0M
YoY Change	-4.31%
Short-Term Debt	$440.0M	$799.0M	$440.0M
YoY Change	-26.3%	-16.77%	-26.3%
Long-Term Debt Due	$442.0M	$336.0M	$442.0M
YoY Change	-23.79%	-71.28%	-23.79%
Total Short-Term Liabilities	$2.505B	$2.392B	$2.505B
YoY Change	-6.77%	-28.49%	-6.77%
LONG-TERM LIABILITIES
Long-Term Debt	$8.915B	$8.221B	$8.915B
YoY Change	13.44%	21.5%	13.44%
Other Long-Term Liabilities	$467.0M	$422.0M	$6.393B
YoY Change	14.46%	-5.17%	2.62%
Total Long-Term Liabilities	$9.382B	$8.643B	$15.31B
YoY Change	13.49%	19.86%	8.65%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.505B	$2.392B	$2.505B
Total Long-Term Liabilities	$9.382B	$8.643B	$15.31B
Total Liabilities	$11.89B	$11.04B	$20.87B
YoY Change	8.52%	4.54%	6.59%
SHAREHOLDERS EQUITY
Retained Earnings	$2.380B	$2.099B
YoY Change	17.59%	23.54%
Common Stock	$2.000M	$2.000M
YoY Change	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$8.059B	$7.705B	$8.059B
YoY Change
Total Liabilities & Shareholders Equity	$28.93B	$27.51B	$28.93B
YoY Change	6.31%	5.48%	6.31%

Cashflow Statement

Concept	2019 Q4	2019 Q1	2019
OPERATING ACTIVITIES
Net Income	$95.00M	$193.0M	$834.0M
YoY Change	37.68%	26.14%	1.58%
Depreciation, Depletion And Amortization	$257.0M	$245.0M	$1.002B
YoY Change	7.53%	6.52%	6.82%
Cash From Operating Activities	$502.0M	$387.0M	$2.170B
YoY Change	3.72%	50.0%	0.0%
INVESTING ACTIVITIES
Capital Expenditures	-$655.0M	$544.0M	$2.411B
YoY Change	5.82%	-6.04%	5.47%
Acquisitions
YoY Change
Other Investing Activities	$18.00M	-$1.000M	-$3.000M
YoY Change	800.0%	-150.0%	-83.33%
Cash From Investing Activities	-$637.0M	-$567.0M	-$2.435B
YoY Change	3.24%	-5.03%	4.24%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$19.00M	-$68.00M
YoY Change		-211.76%	-8.11%
Debt Paid & Issued, Net		$329.0M
YoY Change
Cash From Financing Activities	156.0M	$191.0M	$334.0M
YoY Change	5.41%	-46.94%	62.93%
NET CHANGE
Cash From Operating Activities	502.0M	$387.0M	$2.170B
Cash From Investing Activities	-637.0M	-$567.0M	-$2.435B
Cash From Financing Activities	156.0M	$191.0M	$334.0M
Net Change In Cash	21.00M	$11.00M	$69.00M
YoY Change	40.0%	-47.62%	76.92%
FREE CASH FLOW
Cash From Operating Activities	$502.0M	$387.0M	$2.170B
Capital Expenditures	-$655.0M	$544.0M	$2.411B
Free Cash Flow	$1.157B	-$157.0M	-$241.0M
YoY Change	4.9%	-51.09%	107.76%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	aee	Number Of Additional Weeks After Initial Indemnity Coverage For Power Outage NumberOfAdditionalWeeksAfterInitialIndemnityCoverageForPowerOutage	1.365
CY2019	aee	Numberofweeksofcoverageafterthefirsttwelveweeksofanoutage Numberofweeksofcoverageafterthefirsttwelveweeksofanoutage	1
CY2019	aee	Reductionto Fer Callowedbasereturnoncommonequity ReductiontoFERCallowedbasereturnoncommonequity	0.005
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1000000	USD
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001002910
CY2019Q4	aee	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Changein Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationChangeinDiscountRate	0.0075
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	18000000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	17000000	USD
CY2017	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
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2017	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	14000000	USD
CY2018	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	21000000	USD
CY2019	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	20000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	3000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1000000	USD
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	1-14756
CY2019	dei	Entity Registrant Name EntityRegistrantName	Ameren Corporation
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	43-1723446
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MO
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	1901 Chouteau Avenue
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	St. Louis
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	MO
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	63103
CY2019	dei	City Area Code CityAreaCode	(314)
CY2019	dei	Local Phone Number LocalPhoneNumber	621-3222
CY2019	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value per share
CY2019	dei	Trading Symbol TradingSymbol	AEE
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019Q2	dei	Entity Public Float EntityPublicFloat	18378774986	USD
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	246231712	shares
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
CY2017	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	6174000000	USD
CY2019	us-gaap	Fuel Costs FuelCosts	535000000	USD
CY2018	us-gaap	Fuel Costs FuelCosts	769000000	USD
CY2017	us-gaap	Fuel Costs FuelCosts	737000000	USD
CY2019	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	556000000	USD
CY2018	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	581000000	USD
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CY2019	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	331000000	USD
CY2018	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	374000000	USD
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CY2019	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	1745000000	USD
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CY2019	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	995000000	USD
CY2018	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	955000000	USD
CY2017	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	896000000	USD
CY2019	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	481000000	USD
CY2018	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	483000000	USD
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CY2019	us-gaap	Operating Expenses OperatingExpenses	4643000000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	4934000000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	4764000000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	1267000000	USD
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.16
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.35
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1357000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	1410000000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	130000000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	102000000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	86000000	USD
CY2019	us-gaap	Interest Expense InterestExpense	381000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	401000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	391000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1016000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1058000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1105000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	182000000	USD
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CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	576000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	834000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	821000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	529000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6000000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	828000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	815000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	523000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	834000000	USD
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CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	6000000	USD
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CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	6000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	833000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	811000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	528000000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.37
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.34
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.32
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.14
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
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	242600000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	247100000	shares
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CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	244200000	shares
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	16000000	USD
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CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	463000000	USD
CY2019Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	278000000	USD
CY2018Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	295000000	USD
CY2019Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	63000000	USD
CY2018Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	79000000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	494000000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	483000000	USD
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CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	134000000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	118000000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	63000000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	1431000000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	1533000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	24376000000	USD
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CY2019Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	847000000	USD
CY2018Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	684000000	USD
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CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1127000000	USD
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CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	650000000	USD
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CY2019Q4	us-gaap	Assets Assets	28933000000	USD
CY2018Q4	us-gaap	Assets Assets	27215000000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	442000000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	580000000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	440000000	USD
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CY2019Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	874000000	USD
CY2018Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	817000000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	164000000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	149000000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	585000000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	544000000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2505000000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2687000000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	8915000000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	7859000000	USD
CY2019Q4	us-gaap	Deferred Income Taxes And Other Tax Liabilities Noncurrent DeferredIncomeTaxesAndOtherTaxLiabilitiesNoncurrent	2919000000	USD
CY2018Q4	us-gaap	Deferred Income Taxes And Other Tax Liabilities Noncurrent DeferredIncomeTaxesAndOtherTaxLiabilitiesNoncurrent	2666000000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	4887000000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	4637000000	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	638000000	USD
CY2018Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	627000000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	401000000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	558000000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	467000000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	408000000	USD
CY2019Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	9312000000	USD
CY2018Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	8896000000	USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	2000000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	2000000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	5694000000	USD
CY2018Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	5627000000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2380000000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2024000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-17000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-22000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	8059000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	7631000000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	142000000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	142000000	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
CY2017	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-36000000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	28933000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	27215000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	834000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	821000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	529000000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1002000000	USD
CY2018	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	938000000	USD
CY2017	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	876000000	USD
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	79000000	USD
CY2018	us-gaap	Adjustment For Amortization AdjustmentForAmortization	95000000	USD
CY2017	us-gaap	Adjustment For Amortization AdjustmentForAmortization	76000000	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
CY2017	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	22000000	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
CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	539000000	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
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	24000000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	20000000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	20000000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	17000000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	14000000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-44000000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	10000000	USD
CY2019	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-79000000	USD
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	24000000	USD
CY2017	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	53000000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	10000000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-39000000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-17000000	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
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	32000000	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
CY2017	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	55000000	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
CY2018	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	6000000	USD
CY2017	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	6000000	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
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-34000000	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
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-7000000	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
CY2017	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-21000000	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
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2118000000	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
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2132000000	USD
CY2019	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	31000000	USD
CY2018	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	52000000	USD
CY2017	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	63000000	USD
CY2019	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	256000000	USD
CY2018	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	315000000	USD
CY2017	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	321000000	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
CY2017	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	305000000	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
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	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
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	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
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-7000000	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
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2204000000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	472000000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	451000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	431000000	USD
CY2019	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	6000000	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
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-74000000	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
CY2017	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	681000000	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
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1345000000	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
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	24000000	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
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	15000000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	17000000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	14000000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	11000000	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
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1000000	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
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	102000000	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
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	16000000	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
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	52000000	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
CY2019	us-gaap	Interest Paid Net InterestPaidNet	367000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	387000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	370000000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	13000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	411000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	21000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-19000000	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
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7326000000	USD
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	244500000	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	242600000	shares
CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	242600000	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
CY2017	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	0	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
CY2017	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	0	shares
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
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
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.7775
CY2019	us-gaap	Nature Of Operations NatureOfOperations	<div style="line-height:120%;padding-top:13px;text-indent:24px;font-size:10pt;"><span style="font-family:Arial Narrow;">Ameren,</span><span style="font-family:Arial Narrow;"> headquartered in St. Louis, Missouri, is a public utility holding company whose primary assets are its equity interests in its subsidiaries.</span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:Arial Narrow;">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.</span><span style="font-family:Arial Narrow;font-size:10pt;"> Ameren’s principal subsidiaries are listed below. Ameren also has other subsidiaries that conduct other activities, such as providing shared services.</span></div><table cellpadding="0" cellspacing="0" style="padding-top:13px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><span style="font-family:Arial Narrow;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;font-size:10pt;"><span style="font-family:Arial Narrow;font-size:10pt;">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 </span><span style="font-family:Arial Narrow;font-size:10pt;"><span>24,000</span></span><span style="font-family:Arial Narrow;font-size:10pt;">-square-mile area in central and eastern Missouri, which includes the Greater St. Louis area. Ameren Missouri supplies electric service to </span><span style="font-family:Arial Narrow;font-size:10pt;"><span>1.2 million</span></span><span style="font-family:Arial Narrow;font-size:10pt;"> customers and natural gas service to </span><span style="font-family:Arial Narrow;font-size:10pt;"><span>0.1 million</span></span><span style="font-family:Arial Narrow;font-size:10pt;"> customers.</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><span style="font-family:Arial Narrow;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;font-size:10pt;"><span style="font-family:Arial Narrow;font-size:10pt;">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 </span><span style="font-family:Arial Narrow;font-size:10pt;"><span>43,700</span></span><span style="font-family:Arial Narrow;font-size:10pt;"> square mile area in central and southern Illinois. Ameren Illinois supplies electric service to </span><span style="font-family:Arial Narrow;font-size:10pt;"><span>1.2 million</span></span><span style="font-family:Arial Narrow;font-size:10pt;"> customers and natural gas service to </span><span style="font-family:Arial Narrow;font-size:10pt;"><span>0.8 million</span></span><span style="font-family:Arial Narrow;font-size:10pt;"> customers.</span></div></td></tr></table><div style="line-height:120%;font-size:10pt;padding-left:0px;"><span style="font-family:Arial Narrow;font-size:10pt;">•</span></div><div style="line-height:120%;font-size:10pt;"><span style="font-family:Arial Narrow;font-size:10pt;">Ameren Transmission Company of Illinois, doing business as ATXI, </span><span style="font-family:Arial Narrow;">operates a FERC rate-regulated electric transmission business in the MISO.</span><span style="font-family:Arial Narrow;font-size:10pt;"> ATXI was incorporated in Illinois in 2006. ATXI is constructing the Illinois Rivers project, a MISO-approved electric transmission project, and </span><span style="font-family:Arial Narrow;font-size:10pt;"><span>eight</span></span><span style="font-family:Arial Narrow;font-size:10pt;"> of its </span><span style="font-family:Arial Narrow;font-size:10pt;"><span>nine</span></span><span style="font-family:Arial Narrow;font-size:10pt;"> line segments have been completed and placed in service as of December 31, 2018. ATXI operates the Spoon River project and the Mark Twain project, which were placed in service in February 2018 and December 2019, respectively.</span></div>
CY2018Q4	aee	Completed Transmission Line Segments Illinois Rivers Project CompletedTransmissionLineSegmentsIllinoisRiversProject	8
CY2018Q4	aee	Total Transmission Line Segments Illinois Rivers Project TotalTransmissionLineSegmentsIllinoisRiversProject	9
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	4	segment
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	USD
CY2019Q4	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Assets And Liabilities Net VariableInterestEntityNonconsolidatedCarryingAmountAssetsAndLiabilitiesNet	28000000	USD
CY2018Q4	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Assets And Liabilities Net VariableInterestEntityNonconsolidatedCarryingAmountAssetsAndLiabilitiesNet	22000000	USD
CY2019Q4	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Assets And Liabilities Net VariableInterestEntityNonconsolidatedCarryingAmountAssetsAndLiabilitiesNet	28000000	USD
CY2019Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	264000000	USD
CY2018Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	244000000	USD
CY2019	aee	Miso Resettlements MISOResettlements	0	USD
CY2019Q4	us-gaap	Regulatory Assets RegulatoryAssets	1061000000	USD
CY2018Q4	us-gaap	Regulatory Assets RegulatoryAssets	1261000000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	69000000	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	134000000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	992000000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1127000000	USD
CY2019Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	5051000000	USD
CY2018Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	4786000000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	164000000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	149000000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	4887000000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	4637000000	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
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	34002000000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	12273000000	USD
CY2018Q4	aee	Property Plant And Equipment Net Before Construction Work In Progress PropertyPlantAndEquipmentNetBeforeConstructionWorkInProgress	21729000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	22810000000	USD
CY2019Q4	aee	Numberof Combustion Turbine Electric Generation Equipmentwith Related Financing Obligations NumberofCombustionTurbineElectricGenerationEquipmentwithRelatedFinancingObligations	2	equipment
CY2019Q4	aee	Gross Asset Value Financing Obligation GrossAssetValueFinancingObligation	236000000	USD
CY2018Q4	aee	Gross Asset Value Financing Obligation GrossAssetValueFinancingObligation	235000000	USD
CY2019Q4	aee	Property Plantand Equipment Numberof Financing Obligations PropertyPlantandEquipmentNumberofFinancingObligations	2	equipment
CY2019Q4	aee	Accumulateddepreciationfinancingobligations Accumulateddepreciationfinancingobligations	95000000	USD
CY2018Q4	aee	Accumulateddepreciationfinancingobligations Accumulateddepreciationfinancingobligations	89000000	USD
CY2019Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	2300000000	USD
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
CY2018	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	579000000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	597000000	USD
CY2018Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0226
CY2018	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	1295000000	USD
CY2018	aee	Peak Short Term Borrowings Interest Rate PeakShortTermBorrowingsInterestRate	0.0310
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	8915000000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	7859000000	USD
CY2019Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	1000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	442000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	8000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	505000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	240000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	850000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	7397000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	9442000000	USD
CY2019Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	105.50
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	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
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	68000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	74000000	USD
CY2019	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	800000	shares
CY2018	us-gaap	Stock Issued During Period Shares Other StockIssuedDuringPeriodSharesOther	700000	shares
CY2019	us-gaap	Stock Issued1 StockIssued1	54000000	USD
CY2018	us-gaap	Stock Issued1 StockIssued1	35000000	USD
CY2019Q4	aee	Common Stock Shares Authorized Under401k Plan CommonStockSharesAuthorizedUnder401kPlan	4000000	shares
CY2019Q4	aee	Common Stock Shares Authorized Under Dr Plus Plan CommonStockSharesAuthorizedUnderDRPlusPlan	6000000	shares
CY2019Q3	us-gaap	Forward Contract Indexed To Issuers Equity Indexed Shares ForwardContractIndexedToIssuersEquityIndexedShares	7500000	shares
CY2019Q3	aee	Forward Contract Indexedto Issuers Equity Initial Forward Rate ForwardContractIndexedtoIssuersEquityInitialForwardRate	74.18
CY2019Q3	us-gaap	Forward Contract Indexed To Issuers Equity Indexed Shares ForwardContractIndexedToIssuersEquityIndexedShares	7500000	shares
CY2019Q4	us-gaap	Forward Contract Indexed To Issuers Equity Settlement Alternatives Cash At Fair Value ForwardContractIndexedToIssuersEquitySettlementAlternativesCashAtFairValue	555000000	USD
CY2019Q4	aee	Period End Net Cash Settlement Price PeriodEndNetCashSettlementPrice	25000000	USD
CY2019Q4	aee	Period End Net Share Settlement Price PeriodEndNetShareSettlementPrice	300000	shares
CY2019	aee	Debt Default Provision Excess DebtDefaultProvisionExcess	25000000	USD
CY2019	aee	Debt Default Provision Excess DebtDefaultProvisionExcess	25000000	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
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	24000000	USD
CY2019	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	25000000	USD
CY2018	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	26000000	USD
CY2017	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	26000000	USD
CY2019	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	8000000	USD
CY2018	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	7000000	USD
CY2017	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	8000000	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
CY2017	aee	Defined Benefit Plan Nonservice Costor Income Components DefinedBenefitPlanNonserviceCostorIncomeComponents	44000000	USD
CY2019	us-gaap	Other Income OtherIncome	6000000	USD
CY2018	us-gaap	Other Income OtherIncome	8000000	USD
CY2017	us-gaap	Other Income OtherIncome	5000000	USD
CY2019	aee	Donations Donations	12000000	USD
CY2018	aee	Donations Donations	33000000	USD
CY2017	aee	Donations Donations	8000000	USD
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	15000000	USD
CY2018	us-gaap	Other Noninterest Expense OtherNoninterestExpense	12000000	USD
CY2017	us-gaap	Other Noninterest Expense OtherNoninterestExpense	13000000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	130000000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	102000000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	86000000	USD
CY2019Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	842000000	USD
CY2018Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	679000000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	868000000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	694000000	USD
CY2019Q4	aee	Receivables Payables And Accrued Income Net ReceivablesPayablesAndAccruedIncomeNet	5000000	USD
CY2018Q4	aee	Receivables Payables And Accrued Income Net ReceivablesPayablesAndAccruedIncomeNet	5000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	112000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	114000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	56000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	58000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	94000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	101000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	262000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	273000000	USD
CY2019	aee	Number Of Years The Limit Of Liability And The Maximum Potential Annual Payments Are Adjusted NumberOfYearsTheLimitOfLiabilityAndTheMaximumPotentialAnnualPaymentsAreAdjusted	five years
CY2019Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	216000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	481000000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	216000000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	481000000	USD
CY2019	aee	Defined Benefit Plan Number Of High Quality Bonds Used To Determine Yield Curve DefinedBenefitPlanNumberOfHighQualityBondsUsedToDetermineYieldCurve	900	bond
CY2019Q4	aee	Defined Benefit Plan Estimated Future Employer Contributions Over Next Five Years DefinedBenefitPlanEstimatedFutureEmployerContributionsOverNextFiveYears	70000000	USD
CY2019	aee	Defined Benefit Plan Future Amortization Of Prior Service Cost Credit Period DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCreditPeriod	P10Y
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	35000000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	33000000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	30000000	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	8000000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	3100000	shares
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2019	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	13000000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
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	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
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
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	0
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.01
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.06
CY2017	aee	Effective Income Tax Rate Reconciliation Tax Cut And Jobs Act EffectiveIncomeTaxRateReconciliationTaxCutAndJobsAct	0.14
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.02
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.52
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
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	5000000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	32000000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	511000000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	34000000	USD
CY2017	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-6000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	576000000	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 Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	2880000000	USD
CY2019Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	39000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2919000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3534000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	589000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	126000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	227000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	31000000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	2623000000	USD
CY2018Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	43000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2666000000	USD
CY2019Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	98000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	3000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance Noncurrent DeferredTaxAssetsValuationAllowanceNoncurrent	3000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	0	USD
CY2018Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	91000000	USD
CY2018Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	127000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	14000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance Noncurrent DeferredTaxAssetsValuationAllowanceNoncurrent	5000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	9000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	763000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	453000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	243000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	152000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	108000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	167000000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	1886000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	16000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	16000000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	14000000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	13000000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	120000000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	74000000	USD
CY2019Q4	aee	Restricted Cashand Cash Equivalents Nuclear Decommissioning Trust Fund RestrictedCashandCashEquivalentsNuclearDecommissioningTrustFund	26000000	USD
CY2018Q4	aee	Restricted Cashand Cash Equivalents Nuclear Decommissioning Trust Fund RestrictedCashandCashEquivalentsNuclearDecommissioningTrustFund	4000000	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
CY2019Q4	aee	Payablesforpurchasedreceivables Payablesforpurchasedreceivables	32000000	USD
CY2018Q4	aee	Payablesforpurchasedreceivables Payablesforpurchasedreceivables	33000000	USD
CY2019Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	126000000	USD
CY2018Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	123000000	USD
CY2019Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	63000000	USD
CY2018Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	71000000	USD
CY2019Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	305000000	USD
CY2018Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	289000000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	494000000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	483000000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	38000000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	36000000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	7000000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	29000000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.035
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	8000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	8000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	7000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	6000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	5000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	5000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	39000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	3000000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	36000000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	650000000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	644000000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	20000000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	7000000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	28000000	USD
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	27000000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	33000000	USD
CY2018	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-14000000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	691000000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	650000000	USD
CY2019Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	86000000	USD
CY2018Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	80000000	USD
CY2018	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	shares
CY2019	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	264000000	USD
CY2018	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	282000000	USD
CY2017	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	265000000	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
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	24000000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	20000000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	21000000	USD
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	14000000	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
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	38000000	USD
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
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	242600000	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
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1600000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	100000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	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
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	244200000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2019	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	17000000	USD
CY2018	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	0	USD
CY2017	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	0	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	333000000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	272000000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	361000000	USD
CY2019	us-gaap	Net Realized Or Unrealized Gain Loss On Trading Securities NetRealizedOrUnrealizedGainLossOnTradingSecurities	143000000	USD
CY2018	us-gaap	Net Realized Or Unrealized Gain Loss On Trading Securities NetRealizedOrUnrealizedGainLossOnTradingSecurities	-38000000	USD
CY2017	us-gaap	Net Realized Or Unrealized Gain Loss On Trading Securities NetRealizedOrUnrealizedGainLossOnTradingSecurities	3000000	USD
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CY2017	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	4	segment
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
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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 Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2286000000	USD
CY2017	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	896000000	USD
CY2017	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	34000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	391000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	576000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	523000000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2132000000	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
CY2017	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	6174000000	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
CY2017	aee	Revenuesfromalternativerevenueprograms Revenuesfromalternativerevenueprograms	-15000000	USD
CY2017	aee	Otherrevenuesnotfromcontractswithcustomers Otherrevenuesnotfromcontractswithcustomers	23000000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1556000000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1379000000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1659000000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1316000000	USD
CY2018Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1585000000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1563000000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1724000000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1419000000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	288000000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	280000000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	520000000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	179000000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	273000000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	385000000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	533000000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	166000000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	193000000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	180000000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	366000000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	95000000	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	153000000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	240000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	359000000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	69000000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	191000000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	179000000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	364000000	USD
CY2019Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	94000000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	151000000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	239000000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	357000000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	68000000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.78
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.48
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.38
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.98
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.46
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.28
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.78
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.47
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.38
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.45
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.28

Files In Submission

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$AEE
AMEREN CORP Stock $aee

2019 Q4 Form 10-K Financial Statement

#000100291020000077 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AEE AMEREN CORP Stock $aee

2019 Q4 Form 10-K Financial Statement

#000100291020000077 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AEE
AMEREN CORP Stock $aee