$AEP
AMERICAN ELECTRIC POWER CO INC Stock $aep

$aep Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000000490420000007 Filed on February 20, 2020

Income Statement

Concept	2019 Q4	2018 Q4	2018 Q3
Revenue	$3.616B	$3.801B	$4.333B
YoY Change	-4.87%	-0.24%	5.56%
Cost Of Revenue	$859.0M	$875.0M	$785.0M
YoY Change	-1.83%	8.29%	9.33%
Gross Profit	$2.757B	$2.926B	$3.548B
YoY Change	-5.78%	-2.53%	4.75%
Gross Profit Margin	76.24%	76.98%	81.88%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$658.4M	$622.3M	$633.8M
YoY Change	5.8%	16.19%	14.88%
% of Gross Profit	23.88%	21.27%	17.86%
Operating Expenses	$2.306B	$2.304B	$3.665B
YoY Change	0.09%	5.45%	17.09%
Operating Profit	$294.7M	$551.1M	$668.6M
YoY Change	-46.53%	-24.6%	-31.43%
Interest Expense	-$245.0M	-$211.0M	$256.8M
YoY Change	16.11%	9.9%	15.0%
% of Operating Profit	-83.14%	-38.29%	38.41%
Other Income/Expense, Net	$38.00M	$29.00M	$6.300M
YoY Change	31.03%	81.25%	-55.0%
Pretax Income	$88.00M	$369.0M	$480.9M
YoY Change	-76.15%	-33.39%	-39.93%
Income Tax	-$44.00M	$33.00M	-$80.70M
% Of Pretax Income	-50.0%	8.94%	-16.78%
Net Earnings	$152.7M	$364.8M	$579.7M
YoY Change	-58.14%	-9.21%	4.13%
Net Earnings / Revenue	4.22%	9.6%	13.38%
Basic Earnings Per Share			$1.17
Diluted Earnings Per Share	$311.7K	$734.8K	$1.17
COMMON SHARES
Basic Shares Outstanding	494.2M shares	493.2M shares	493.0M shares
Diluted Shares Outstanding			493.9M shares

Balance Sheet

Concept	2019 Q4	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$450.0M	$393.0M	$952.0M
YoY Change	14.5%	4.52%	45.34%
Cash & Equivalents	$246.8M	$234.1M	$788.3M
Short-Term Investments	$203.0M	$159.0M	$164.0M
Other Short-Term Assets	$976.0M	$1.083B	$1.016B
YoY Change	-9.88%	-14.18%	7.63%
Inventory	$1.169B	$921.0M	$848.0M
Prepaid Expenses
Receivables	$1.705B	$1.927B	$2.118B
Other Receivables	$27.00M	$55.00M	$47.00M
Total Short-Term Assets	$4.078B	$4.114B	$4.692B
YoY Change	-0.88%	-3.27%	15.35%
LONG-TERM ASSETS
Property, Plant & Equipment	$60.14B	$55.10B	$53.36B
YoY Change	9.15%	9.62%	10.43%
Goodwill	$52.50M	$52.50M	$52.50M
YoY Change	0.0%	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$1.357B	$846.2M
YoY Change	60.32%	4.17%
Other Assets	$3.407B	$2.577B	$2.395B
YoY Change	32.2%	0.94%	28.96%
Total Long-Term Assets	$11.68B	$9.590B	$9.569B
YoY Change	21.76%	-6.12%	-17.37%
TOTAL ASSETS
Total Short-Term Assets	$4.078B	$4.114B	$4.692B
Total Long-Term Assets	$11.68B	$9.590B	$9.569B
Total Assets	$75.89B	$68.80B	$67.62B
YoY Change	10.3%	6.29%	5.71%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.086B	$1.874B	$1.580B
YoY Change	11.28%	-9.25%	2.79%
Accrued Expenses	$478.0M	$232.0M	$300.0M
YoY Change	106.03%	-1.28%	15.38%
Deferred Revenue
YoY Change
Short-Term Debt	$2.838B	$1.910B	$2.243B
YoY Change	48.6%	16.56%	111.71%
Long-Term Debt Due	$1.599B	$1.699B	$1.904B
YoY Change	-5.88%	-3.15%	-19.29%
Total Short-Term Liabilities	$10.30B	$8.649B	$8.426B
YoY Change	19.08%	4.56%	15.08%
LONG-TERM LIABILITIES
Long-Term Debt	$25.13B	$21.65B	$20.87B
YoY Change	16.07%	11.48%	13.66%
Other Long-Term Liabilities	$719.8M	$782.6M	$807.2M
YoY Change	-8.02%	-5.81%	-3.56%
Total Long-Term Liabilities	$45.57B	$40.99B	$40.04B
YoY Change	11.19%	7.48%	3.93%
TOTAL LIABILITIES
Total Short-Term Liabilities	$10.30B	$8.649B	$8.426B
Total Long-Term Liabilities	$45.57B	$40.99B	$40.04B
Total Liabilities	$55.87B	$49.63B	$48.47B
YoY Change	12.56%	6.96%	5.71%
SHAREHOLDERS EQUITY
Retained Earnings	$9.901B	$9.325B	$9.294B
YoY Change	6.17%	8.1%	8.93%
Common Stock	$3.343B	$3.337B	$3.337B
YoY Change	0.18%	0.24%	0.25%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares	20.20M shares	20.20M shares	20.20M shares
Shareholders Equity	$19.63B	$19.03B	$19.02B
YoY Change
Total Liabilities & Shareholders Equity	$75.89B	$68.80B	$67.62B
YoY Change	10.3%	6.29%	5.71%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$152.7M	$364.8M	$579.7M
YoY Change	-58.14%	-9.21%	4.13%
Depreciation, Depletion And Amortization	$658.4M	$622.3M	$633.8M
YoY Change	5.8%	16.19%	14.88%
Cash From Operating Activities	$920.2M	$1.291B	$1.926B
YoY Change	-28.7%	12.6%	36.85%
INVESTING ACTIVITIES
Capital Expenditures	-$1.716B	-$1.643B	-$1.467B
YoY Change	4.46%	-15.68%	12.66%
Acquisitions
YoY Change
Other Investing Activities	-$71.10M	-$22.40M	$17.10M
YoY Change	217.41%	-257.75%	-171.85%
Cash From Investing Activities	-$1.787B	-$1.665B	-$1.450B
YoY Change	7.33%	-13.9%	9.34%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	809.5M	-119.1M	74.20M
YoY Change	-779.68%	-116.79%	13.8%
NET CHANGE
Cash From Operating Activities	920.2M	1.291B	1.926B
Cash From Investing Activities	-1.787B	-1.665B	-1.450B
Cash From Financing Activities	809.5M	-119.1M	74.20M
Net Change In Cash	-57.20M	-493.4M	550.2M
YoY Change	-88.41%	530.95%	275.56%
FREE CASH FLOW
Cash From Operating Activities	$920.2M	$1.291B	$1.926B
Capital Expenditures	-$1.716B	-$1.643B	-$1.467B
Free Cash Flow	$2.636B	$2.933B	$3.393B
YoY Change	-10.13%	-5.2%	25.22%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2019Q4	aep	Forward Equity Contract Payment Rate ForwardEquityContractPaymentRate	0.02725
CY2019	aep	Forward Equity Purchase Contract Date ForwardEquityPurchaseContractDate	2024
CY2019	aep	Kentucky Net Operating Loss Limitation Percent KentuckyNetOperatingLossLimitationPercent	0.8000
CY2019	aep	Kentucky Single Corporate Tax Rate KentuckySingleCorporateTaxRate	0.05
CY2019	aep	Periodwith No Changein Unrecognized Tax Benefits PeriodwithNoChangeinUnrecognizedTaxBenefits	P12M
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	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000004904
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
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.39
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.53
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.71
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	6.50
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	6.50
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	600000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	600000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	513450036	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	514373631	shares
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	46700000	USD
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CY2019	dei	Document Type DocumentType	10-K
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	1-3525
CY2019	dei	Entity Registrant Name EntityRegistrantName	AMERICAN ELECTRIC POWER CO INC.
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	NY
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	13-4922640
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	1 Riverside Plaza,
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Columbus,
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	OH
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	43215-2373
CY2019	dei	City Area Code CityAreaCode	(614)
CY2019	dei	Local Phone Number LocalPhoneNumber	716-1000
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CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
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CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
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CY2019Q4	us-gaap	Other Receivables OtherReceivables	27200000	USD
CY2018Q4	us-gaap	Other Receivables OtherReceivables	55200000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	43700000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	36800000	USD
CY2019Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	640700000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.89
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.90
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.89
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	495306238	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	493758277	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	492611067	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.88
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.90
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.88
CY2019	us-gaap	Profit Loss ProfitLoss	1919800000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1931300000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	1928900000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-79400000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	14600000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-2600000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	3500000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	5600000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	5300000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1100000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	57700000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-33000000.0	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	86500000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-27300000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-23700000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	88500000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1892500000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1907600000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	2017400000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-1300000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7500000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	16300000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1893800000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1900100000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2001100000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	17420100000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	12200000	USD
CY2017	us-gaap	Dividends Common Stock DividendsCommonStock	1191900000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	55800000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	92900000	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	150100000	USD
CY2019Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	60400000	USD
CY2018Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	141400000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	242100000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	208800000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	4077800000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	4113900000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	22762400000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	21699900000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	24808600000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	21531000000.0	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	22443400000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	21195400000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	4811500000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	4265000000.0	USD
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	4319800000	USD
CY2018Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	4393900000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	79145700000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	73085200000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	19007600000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	17986100000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	60138100000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	55099100000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3158800000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3310400000	USD
CY2019Q4	us-gaap	Securitized Regulatory Transition Assets Noncurrent SecuritizedRegulatoryTransitionAssetsNoncurrent	858100000	USD
CY2018Q4	us-gaap	Securitized Regulatory Transition Assets Noncurrent SecuritizedRegulatoryTransitionAssetsNoncurrent	920600000	USD
CY2019Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	2975700000	USD
CY2018Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	2474900000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	52500000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	52500000	USD
CY2019Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	266600000	USD
CY2018Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	254000000.0	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	957400000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	0	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	3407300000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	2577400000	USD
CY2019Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	11676400000	USD
CY2018Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	9589800000	USD
CY2019Q4	us-gaap	Assets Assets	75892300000	USD
CY2018Q4	us-gaap	Assets Assets	68802800000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	2085800000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	1874300000	USD
CY2019Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	710000000.0	USD
CY2018Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	750000000.0	USD
CY2019Q4	us-gaap	Short Term Bank Loans And Notes Payable ShortTermBankLoansAndNotesPayable	2128300000	USD
CY2018Q4	us-gaap	Short Term Bank Loans And Notes Payable ShortTermBankLoansAndNotesPayable	1160000000.0	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	2838300000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	1910000000.0	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1598700000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1698500000	USD
CY2019Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	114300000	USD
CY2018Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	55000000.0	USD
CY2019Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	366100000	USD
CY2018Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	412200000	USD
CY2019Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	1357800000	USD
CY2018Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	1218000000.0	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	243600000	USD
CY2018Q4	us-gaap	Interest Payable Current InterestPayableCurrent	231700000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	234100000	USD
CY2018Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	0	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	86600000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	58600000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1373800000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1190500000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	10299100000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	8648800000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	25126800000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	21648200000	USD
CY2019Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	261800000	USD
CY2018Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	263400000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	7588200000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	7086500000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	8457600000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	8540300000	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	2216600000	USD
CY2018Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	2287700000	USD
CY2019Q4	aep	Employee Benefits And Pension Obligations EmployeeBenefitsAndPensionObligations	466000000.0	USD
CY2018Q4	aep	Employee Benefits And Pension Obligations EmployeeBenefitsAndPensionObligations	377100000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	734600000	USD
CY2018Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	0	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	719800000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	782600000	USD
CY2019Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	45571400000	USD
CY2018Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	40985800000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	55870500000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	49634600000	USD
CY2019Q4	aep	Rate Matters RateMatters		USD
CY2018Q4	aep	Rate Matters RateMatters		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	65700000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	69400000	USD
CY2019Q4	aep	Mezzanine Equity MezzanineEquity	42900000	USD
CY2018Q4	aep	Mezzanine Equity MezzanineEquity	39400000	USD
CY2019Q4	aep	Total Mezzanine Equity TotalMezzanineEquity	108600000	USD
CY2018Q4	aep	Total Mezzanine Equity TotalMezzanineEquity	108800000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	3343400000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	3337400000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	6535600000	USD
CY2018Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	6486100000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	9900900000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	9325300000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-147700000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-120400000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	19632200000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	19028400000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	281000000.0	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	31000000.0	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	19913200000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	19059400000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	75892300000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	68802800000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1919800000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1931300000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	1928900000	USD
CY2019	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2514500000	USD
CY2018	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2286600000	USD
CY2017	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	1997200000	USD
CY2019	aep	Operating Lease Cost Rockport OperatingLeaseCostRockport	136500000	USD
CY2018	aep	Operating Lease Cost Rockport OperatingLeaseCostRockport	0	USD
CY2017	aep	Operating Lease Cost Rockport OperatingLeaseCostRockport	0	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-17800000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	104300000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	901500000	USD
CY2019	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	156400000	USD
CY2018	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	70600000	USD
CY2017	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	87100000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	168400000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	132500000	USD
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	93700000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	29200000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	66400000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	23300000	USD
CY2019	aep	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	89100000	USD
CY2018	aep	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	113800000	USD
CY2017	aep	Amortization Of Nuclear Fuel AmortizationOfNuclearFuel	129100000	USD
CY2019	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-24600000	USD
CY2018	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-42800000	USD
CY2017	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	27800000	USD
CY2019	us-gaap	Pension Contributions PensionContributions	0	USD
CY2018	us-gaap	Pension Contributions PensionContributions	0	USD
CY2017	us-gaap	Pension Contributions PensionContributions	93300000	USD
CY2019	us-gaap	Amortization Of Deferred Property Taxes AmortizationOfDeferredPropertyTaxes	-73800000	USD
CY2018	us-gaap	Amortization Of Deferred Property Taxes AmortizationOfDeferredPropertyTaxes	-59100000	USD
CY2017	us-gaap	Amortization Of Deferred Property Taxes AmortizationOfDeferredPropertyTaxes	-29500000	USD
CY2019	aep	Fuel Over Under Recovery Net FuelOverUnderRecoveryNet	-85200000	USD
CY2018	aep	Fuel Over Under Recovery Net FuelOverUnderRecoveryNet	-189700000	USD
CY2017	aep	Fuel Over Under Recovery Net FuelOverUnderRecoveryNet	-84400000	USD
CY2019	aep	Gainon Saleof Merchant Generation Assets GainonSaleofMerchantGenerationAssets	0	USD
CY2018	aep	Gainon Saleof Merchant Generation Assets GainonSaleofMerchantGenerationAssets	0	USD
CY2017	aep	Gainon Saleof Merchant Generation Assets GainonSaleofMerchantGenerationAssets	226400000	USD
CY2019	aep	Deferral Of Ohio Capacity Costs DeferralOfOhioCapacityCosts	34100000	USD
CY2018	aep	Deferral Of Ohio Capacity Costs DeferralOfOhioCapacityCosts	67700000	USD
CY2017	aep	Deferral Of Ohio Capacity Costs DeferralOfOhioCapacityCosts	83200000	USD
CY2019	aep	Provisionfor Refund Global Settlement ProvisionforRefundGlobalSettlement	-16500000	USD
CY2018	aep	Provisionfor Refund Global Settlement ProvisionforRefundGlobalSettlement	-5500000	USD
CY2017	aep	Provisionfor Refund Global Settlement ProvisionforRefundGlobalSettlement	-98200000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	97400000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-119800000	USD
CY2017	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	423900000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-116100000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-247800000	USD
CY2017	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-28500000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-145900000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	129000000.0	USD
CY2017	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	181700000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	12200000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	4536600000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	4945700000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	248200000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-20700000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-17900000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	5800000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	36600000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-58000000.0	USD
CY2019	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	138900000	USD
CY2018	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	153200000	USD
CY2017	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	91900000	USD
CY2019	aep	Operating Lease Payments Rockport OperatingLeasePaymentsRockport	147700000	USD
CY2018	aep	Operating Lease Payments Rockport OperatingLeasePaymentsRockport	0	USD
CY2017	aep	Operating Lease Payments Rockport OperatingLeasePaymentsRockport	0	USD
CY2019	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-70700000	USD
CY2018	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-10500000	USD
CY2017	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	60700000	USD
CY2019	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-189000000.0	USD
CY2018	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	149800000	USD
CY2017	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-181800000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4270100000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	5223200000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4270400000	USD
CY2019	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	6051400000	USD
CY2018	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	6310900000	USD
CY2017	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	5691300000	USD
CY2019	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1576000000.0	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	2067800000	USD
CY2017	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	2314700000	USD
CY2019	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	1494200000	USD
CY2018	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	2010000000.0	USD
CY2017	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	2256300000	USD
CY2019	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	92300000	USD
CY2018	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	46100000	USD
CY2017	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	108000000.0	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	918400000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	0	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	0	USD
CY2019	aep	Proceeds From Sale Of Merchant Generation Assets ProceedsFromSaleOfMerchantGenerationAssets	0	USD
CY2018	aep	Proceeds From Sale Of Merchant Generation Assets ProceedsFromSaleOfMerchantGenerationAssets	0	USD
CY2017	aep	Proceeds From Sale Of Merchant Generation Assets ProceedsFromSaleOfMerchantGenerationAssets	2159600000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	600000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-61200000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-41700000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-7144500000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-6353600000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3656400000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	65300000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	73600000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	3854100000	USD
CY2019	us-gaap	Proceeds From Short Term Debt Maturing In More Than Three Months ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths	0	USD
CY2018	us-gaap	Proceeds From Short Term Debt Maturing In More Than Three Months ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths	205600000	USD
CY2017	us-gaap	Proceeds From Short Term Debt Maturing In More Than Three Months ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths	0	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	928300000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	271400000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-74400000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1220800000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2782000000.0	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	3087900000	USD
CY2019	us-gaap	Repayments Of Short Term Debt Maturing In More Than Three Months RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths	0	USD
CY2018	us-gaap	Repayments Of Short Term Debt Maturing In More Than Three Months RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths	205600000	USD
CY2017	us-gaap	Repayments Of Short Term Debt Maturing In More Than Three Months RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths	0	USD
CY2019	aep	Make Whole Premiumon Extinguishmentof Longterm Debt MakeWholePremiumonExtinguishmentofLongtermDebt	5000000.0	USD
CY2018	aep	Make Whole Premiumon Extinguishmentof Longterm Debt MakeWholePremiumonExtinguishmentofLongtermDebt	13500000	USD
CY2017	aep	Make Whole Premiumon Extinguishmentof Longterm Debt MakeWholePremiumonExtinguishmentofLongtermDebt	46100000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	70700000	USD
CY2018	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	65100000	USD
CY2017	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	67300000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1350000000.0	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1255500000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1191900000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-20800000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-12700000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3600000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2862900000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1161900000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-604900000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-11500000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	31500000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	9100000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	444100000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	412600000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	403500000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	432600000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	444100000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	412600000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	185800000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	432600000	USD
CY2019	us-gaap	Basis Of Accounting BasisOfAccounting	<div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;font-weight:bold;">ORGANIZATION</span></div><div style="line-height:120%;text-align:justify;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">The Registrants engage in the generation, transmission and distribution of electric power. The Registrant Subsidiaries that conduct most of these activities are regulated by the FERC under the Federal Power Act and the Energy Policy Act of 2005 and maintain accounts in accordance with the FERC and other regulatory guidelines. Most of these companies are subject to further regulation with regard to rates and other matters by state regulatory commissions.</span></div><div style="line-height:120%;text-align:justify;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">AEP provides competitive electric and gas supply for residential, commercial and industrial customers in deregulated electricity markets and also provides energy management solutions throughout the United States, including energy efficiency services through its independent retail electric supplier.</span></div><div style="line-height:120%;text-align:justify;font-size:9pt;"><span style="font-family:inherit;font-size:9pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">The Registrants also engage in wholesale electricity, natural gas and other commodity marketing and risk management activities in the United States and provide various energy-related services. In addition, AEP operates competitive wind and solar farms. I&M provides barging services to both affiliated and nonaffiliated companies. SWEPCo, through consolidated and nonconsolidated affiliates, conducts lignite mining operations to fuel certain of its generation facilities. </span></div>
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;font-style:italic;font-weight:bold;">Use of Estimates</span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">The preparation of these financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. These estimates include, but are not limited to, inventory valuation, allowance for doubtful accounts, goodwill, intangible and long-lived asset impairment, unbilled electricity revenue, valuation of long-term energy contracts, the effects of regulation, long-lived asset recovery, storm costs, the effects of contingencies and certain assumptions made in accounting for pension and postretirement benefits. The estimates and assumptions used are based upon management’s evaluation of the relevant facts and circumstances as of the date of the financial statements. Actual results could ultimately differ from those estimates.</span></div>
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	246800000	USD
CY2019	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;">The Registrant Subsidiaries monitor credit levels and the financial condition of their customers on a continuous basis to minimize credit risk. The regulatory commissions allow recovery in rates for a reasonable level of bad debt costs. Management believes adequate provisions for credit loss have been made in the accompanying Registrant Subsidiary financial statements.</span></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><span style="font-family:inherit;font-size:11pt;"><br/></span></div>
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	234100000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	210000000.0	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	444100000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.89
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1921100000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1923800000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1912600000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	493700000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	492800000	shares
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.90
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	491800000	shares
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.89
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	495300000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.88
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	493800000	shares
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.90
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	492600000	shares
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.88
CY2019	us-gaap	Depreciation Depreciation	2203700000	USD
CY2019	aep	Amortizationof Certain Securitized Assets AmortizationofCertainSecuritizedAssets	280700000	USD
CY2019	aep	Amortizationof Regulatory Assetsand Liabilities AmortizationofRegulatoryAssetsandLiabilities	30100000	USD
CY2019	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2514500000	USD
CY2018	us-gaap	Depreciation Depreciation	1965000000.0	USD
CY2018	aep	Amortizationof Certain Securitized Assets AmortizationofCertainSecuritizedAssets	287900000	USD
CY2018	aep	Amortizationof Regulatory Assetsand Liabilities AmortizationofRegulatoryAssetsandLiabilities	33700000	USD
CY2018	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2286600000	USD
CY2017	us-gaap	Depreciation Depreciation	1709100000	USD
CY2017	aep	Amortizationof Certain Securitized Assets AmortizationofCertainSecuritizedAssets	275900000	USD
CY2017	aep	Amortizationof Regulatory Assetsand Liabilities AmortizationofRegulatoryAssetsandLiabilities	12200000	USD
CY2017	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	1997200000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	1022500000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	939300000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	858300000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	6100000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-24700000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1100000	USD
CY2019	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	87500000	USD
CY2018	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	55600000	USD
CY2017	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	60700000	USD
CY2019	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	1341100000	USD
CY2018	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	1120400000	USD
CY2017	us-gaap	Construction In Progress Expenditures Incurred But Not Yet Paid ConstructionInProgressExpendituresIncurredButNotYetPaid	1330800000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	0	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	0	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	71800000	USD
CY2019	aep	Acquisition Of Nuclear Fuel Included In Current Liabilities AcquisitionOfNuclearFuelIncludedInCurrentLiabilities	100000	USD
CY2018	aep	Acquisition Of Nuclear Fuel Included In Current Liabilities AcquisitionOfNuclearFuelIncludedInCurrentLiabilities	4000000.0	USD
CY2017	aep	Acquisition Of Nuclear Fuel Included In Current Liabilities AcquisitionOfNuclearFuelIncludedInCurrentLiabilities	0	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	0	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	84000000.0	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	0	USD
CY2019	aep	Expected Reimbursement For Spent Nuclear Fuel Dry Cask Storage ExpectedReimbursementForSpentNuclearFuelDryCaskStorage	300000	USD
CY2018	aep	Expected Reimbursement For Spent Nuclear Fuel Dry Cask Storage ExpectedReimbursementForSpentNuclearFuelDryCaskStorage	2200000	USD
CY2017	aep	Expected Reimbursement For Spent Nuclear Fuel Dry Cask Storage ExpectedReimbursementForSpentNuclearFuelDryCaskStorage	2600000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	32400000	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	0	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	0	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-120400000	USD
CY2019	aep	Other Comprehensive Income Unrealized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossArisingDuringPeriodNetOfTax	-69700000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	53700000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	42400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-27300000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-147700000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-67800000	USD
CY2018	aep	Other Comprehensive Income Unrealized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossArisingDuringPeriodNetOfTax	6600000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-38300000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-30300000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-23700000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-120400000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-156300000	USD
CY2017	aep	Other Comprehensive Income Unrealized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossArisingDuringPeriodNetOfTax	71200000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	26400000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	17300000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	88500000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-67800000	USD
CY2019Q4	aep	Shareof Net Investmentin Dolet Hills Power Station ShareofNetInvestmentinDoletHillsPowerStation	157000000	USD
CY2019Q4	aep	Dolet Hills Lignite Company Unbilled Fixed Costs DoletHillsLigniteCompanyUnbilledFixedCosts	106000000	USD
CY2019Q4	aep	Oxbow Unbilled Fixed Costs OxbowUnbilledFixedCosts	22000000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	92900000	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	150100000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3158800000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3310400000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	86600000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	58600000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	8457600000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	8540300000	USD
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
CY2019Q4	us-gaap	Recorded Unconditional Purchase Obligation Due Within One Year RecordedUnconditionalPurchaseObligationDueWithinOneYear	1274800000	USD
CY2019Q4	aep	Recorded Unconditional Purchase Obligation Due Within Two To Three Year RecordedUnconditionalPurchaseObligationDueWithinTwoToThreeYear	1458200000	USD
CY2019Q4	aep	Recorded Unconditional Purchase Obligation Due Within Four To Five Year RecordedUnconditionalPurchaseObligationDueWithinFourToFiveYear	507900000	USD
CY2019Q4	us-gaap	Recorded Unconditional Purchase Obligation Due After Fifth Year RecordedUnconditionalPurchaseObligationDueAfterFifthYear	1191400000	USD
CY2019Q4	us-gaap	Recorded Unconditional Purchase Obligation RecordedUnconditionalPurchaseObligation	4432300000	USD
CY2019	us-gaap	Payments For Environmental Liabilities PaymentsForEnvironmentalLiabilities	7500000	USD
CY2019	aep	Matching Contributions Provided Percentage MatchingContributionsProvidedPercentage	1
CY2019	aep	Eligible Compensation Contribution By Employee Percentage EligibleCompensationContributionByEmployeePercentage	0.01
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	115300000	USD
CY2019	aep	Second Matching Contributions Provided Percentage SecondMatchingContributionsProvidedPercentage	0.70
CY2019	aep	Second Eligible Compensation Contribution By Employee Percentage SecondEligibleCompensationContributionByEmployeePercentage	0.05
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	76400000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	71800000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	74600000	USD
CY2019Q4	us-gaap	Multiemployer Plans Withdrawal Obligation MultiemployerPlansWithdrawalObligation	20000000	USD
CY2018Q4	us-gaap	Multiemployer Plans Withdrawal Obligation MultiemployerPlansWithdrawalObligation	15000000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	15561400000	USD
CY2019	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	0	USD
CY2019	us-gaap	Revenues Revenues	15561400000	USD
CY2019	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	156400000	USD
CY2019	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2514500000	USD
CY2019	us-gaap	Interest Expense InterestExpense	1072500000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-12900000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	72100000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1919800000	USD
CY2019	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	6969800000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	79145700000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	19007600000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	60138100000	USD
CY2019Q4	us-gaap	Assets Assets	75892300000	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	1356600000	USD
CY2019Q4	aep	Affiliated Long Term Debt Current AffiliatedLongTermDebtCurrent	0	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1598700000	USD
CY2019Q4	aep	Affiliated Long Term Debt Noncurrent AffiliatedLongTermDebtNoncurrent	0	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	25126800000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	26725500000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	16195700000	USD
CY2018	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	0	USD
CY2018	us-gaap	Revenues Revenues	16195700000	USD
CY2018	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	70600000	USD
CY2018	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	2286600000	USD
CY2018	us-gaap	Interest Expense InterestExpense	984400000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	73100000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1931300000	USD
CY2018	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	6325500000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	73085200000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	17986100000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	55099100000	USD
CY2018Q4	us-gaap	Assets Assets	68802800000	USD
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	846200000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1698500000	USD
CY2018Q4	aep	Affiliated Long Term Debt Noncurrent AffiliatedLongTermDebtNoncurrent	0	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	21648200000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	23346700000	USD
CY2017	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	15424900000	USD
CY2017	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	0	USD
CY2017	us-gaap	Revenues Revenues	15424900000	USD
CY2017	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	87100000	USD
CY2017	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	1997200000	USD
CY2017	us-gaap	Interest Expense InterestExpense	895000000.0	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	969700000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	82400000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	1928900000	USD
CY2017	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	5698100000	USD
CY2017Q4	us-gaap	Assets Assets	64729100000	USD
CY2019Q4	us-gaap	Securities Received As Collateral SecuritiesReceivedAsCollateral	5000000	USD
CY2018Q4	us-gaap	Securities Received As Collateral SecuritiesReceivedAsCollateral	18000000	USD
CY2019Q4	us-gaap	Obligation To Return Securities Received As Collateral ObligationToReturnSecuritiesReceivedAsCollateral	39000000	USD
CY2018Q4	us-gaap	Obligation To Return Securities Received As Collateral ObligationToReturnSecuritiesReceivedAsCollateral	4000000	USD
CY2019	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	125000000.0	USD
CY2018	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	291300000	USD
CY2017	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	136000000.0	USD
CY2019Q4	aep	Carrying Amountof Hedged Asset Liability CarryingAmountofHedgedAssetLiability	-510800000	USD
CY2018Q4	aep	Carrying Amountof Hedged Asset Liability CarryingAmountofHedgedAssetLiability	-478300000	USD
CY2019Q4	aep	Cumulative Fair Value Hedging Adjustmentinthe Carrying Amountofthe Hedged Asset Liability CumulativeFairValueHedgingAdjustmentintheCarryingAmountoftheHedgedAssetLiability	-14500000	USD
CY2018Q4	aep	Cumulative Fair Value Hedging Adjustmentinthe Carrying Amountofthe Hedged Asset Liability CumulativeFairValueHedgingAdjustmentintheCarryingAmountoftheHedgedAssetLiability	17400000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	31900000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-11300000	USD
CY2017	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-4800000	USD
CY2019	aep	Gain Loss On Fair Value Portion Of Long Term Debt GainLossOnFairValuePortionOfLongTermDebt	-31900000	USD
CY2018	aep	Gain Loss On Fair Value Portion Of Long Term Debt GainLossOnFairValuePortionOfLongTermDebt	11300000	USD
CY2017	aep	Gain Loss On Fair Value Portion Of Long Term Debt GainLossOnFairValuePortionOfLongTermDebt	4800000	USD
CY2019Q4	aep	Fair Value Of Derivative Liabilities Subject To Cross Default Provisions FairValueOfDerivativeLiabilitiesSubjectToCrossDefaultProvisions	267300000	USD
CY2019Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	3700000	USD
CY2019Q4	us-gaap	Assets Needed For Immediate Settlement Aggregate Fair Value AssetsNeededForImmediateSettlementAggregateFairValue	246700000	USD
CY2018Q4	aep	Fair Value Of Derivative Liabilities Subject To Cross Default Provisions FairValueOfDerivativeLiabilitiesSubjectToCrossDefaultProvisions	225500000	USD
CY2018Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	1800000	USD
CY2018Q4	us-gaap	Assets Needed For Immediate Settlement Aggregate Fair Value AssetsNeededForImmediateSettlementAggregateFairValue	181000000.0	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	26725500000	USD
CY2019Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	30172000000.0	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	23346700000	USD
CY2018Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	24093900000	USD
CY2019Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	367100000	USD
CY2019Q4	us-gaap	Investment Owned Unrecognized Unrealized Appreciation InvestmentOwnedUnrecognizedUnrealizedAppreciation	21400000	USD
CY2019Q4	us-gaap	Investment Owned Unrecognized Unrealized Depreciation InvestmentOwnedUnrecognizedUnrealizedDepreciation	0	USD
CY2019Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	388500000	USD
CY2018Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	355000000.0	USD
CY2018Q4	us-gaap	Investment Owned Unrecognized Unrealized Appreciation InvestmentOwnedUnrecognizedUnrealizedAppreciation	16400000	USD
CY2018Q4	us-gaap	Investment Owned Unrecognized Unrealized Depreciation InvestmentOwnedUnrecognizedUnrealizedDepreciation	2300000	USD
CY2018Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	369100000	USD
CY2019	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	21200000	USD
CY2018	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	0	USD
CY2017	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	0	USD
CY2019	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	45000000.0	USD
CY2018	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	3100000	USD
CY2017	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	14200000	USD
CY2019	aep	Gross Realized Gains On Investment Sales On Short Term Investment GrossRealizedGainsOnInvestmentSalesOnShortTermInvestment	0	USD
CY2018	aep	Gross Realized Gains On Investment Sales On Short Term Investment GrossRealizedGainsOnInvestmentSalesOnShortTermInvestment	0	USD
CY2017	aep	Gross Realized Gains On Investment Sales On Short Term Investment GrossRealizedGainsOnInvestmentSalesOnShortTermInvestment	0	USD
CY2019	aep	Gross Realized Losses On Investment Sales On Short Term Investment GrossRealizedLossesOnInvestmentSalesOnShortTermInvestment	400000	USD
CY2018	aep	Gross Realized Losses On Investment Sales On Short Term Investment GrossRealizedLossesOnInvestmentSalesOnShortTermInvestment	0	USD
CY2017	aep	Gross Realized Losses On Investment Sales On Short Term Investment GrossRealizedLossesOnInvestmentSalesOnShortTermInvestment	0	USD
CY2019Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	2975700000	USD
CY2018Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	2474900000	USD
CY2019Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	388500000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	439400000	USD
CY2019Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	2975700000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	3803600000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	376100000	USD
CY2018Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	369100000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	416800000	USD
CY2018Q4	aep	Spent Nuclear Fuel And Decommissioning Trusts SpentNuclearFuelAndDecommissioningTrusts	2474900000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	3260800000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	318400000	USD
CY2018Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	131200000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	15800000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Change In Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	-100000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Other Comprehensive Income Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss	-15100000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases Sales Issues Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements	-117600000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	-600000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	35600000	USD
CY2019	aep	Changes In Fair Value Allocated To Regulated Jurisdiction ChangesInFairValueAllocatedToRegulatedJurisdiction	60700000	USD
CY2019Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	109900000	USD
CY2017Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	40300000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	148900000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Change In Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	9800000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Other Comprehensive Income Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss	15700000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases Sales Issues Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements	-214000000.0	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	15800000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	-1600000	USD
CY2018	aep	Changes In Fair Value Allocated To Regulated Jurisdiction ChangesInFairValueAllocatedToRegulatedJurisdiction	116300000	USD
CY2018Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	131200000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	115300000	USD
CY2016Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	2500000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	37300000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Change In Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	33600000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Other Comprehensive Income Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss	-18800000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases Sales Issues Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements	-50600000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	16200000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	-10100000	USD
CY2017	aep	Changes In Fair Value Allocated To Regulated Jurisdiction ChangesInFairValueAllocatedToRegulatedJurisdiction	30200000	USD
CY2017Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	40300000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-7400000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-77100000	USD
CY2019	us-gaap	Investment Tax Credit InvestmentTaxCredit	5500000	USD
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-79000000.0	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4400000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	59300000	USD
CY2019	aep	Deferred Stateand Local Investment Tax Credits DeferredStateandLocalInvestmentTaxCredits	2400000	USD
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	66100000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-12900000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-31700000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	112800000	USD
CY2018	us-gaap	Investment Tax Credit InvestmentTaxCredit	9200000	USD
CY2018	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	90300000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	30800000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-8500000	USD
CY2018	aep	Deferred Stateand Local Investment Tax Credits DeferredStateandLocalInvestmentTaxCredits	2700000	USD
CY2018	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	25000000.0	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-4000000.0	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	856600000	USD
CY2017	us-gaap	Investment Tax Credit InvestmentTaxCredit	48600000	USD
CY2017	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	901200000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	16000000.0	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	44900000	USD
CY2017	aep	Deferred Stateand Local Investment Tax Credits DeferredStateandLocalInvestmentTaxCredits	7600000	USD
CY2017	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	68500000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	969700000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1919800000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1931300000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	1928900000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-12900000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	115300000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	969700000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1903900000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2043900000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2898600000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	399800000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	429200000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	1014500000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	23100000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	24400000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	60200000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	13000000.0	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	20200000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	18800000	USD
CY2019	aep	Increase Decrease In Income Taxes Due To Energy Production Credits IncreaseDecreaseInIncomeTaxesDueToEnergyProductionCredits	-59000000.0	USD
CY2018	aep	Increase Decrease In Income Taxes Due To Energy Production Credits IncreaseDecreaseInIncomeTaxesDueToEnergyProductionCredits	-10300000	USD
CY2017	aep	Increase Decrease In Income Taxes Due To Energy Production Credits IncreaseDecreaseInIncomeTaxesDueToEnergyProductionCredits	0	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Settlements State And Local IncomeTaxReconciliationTaxSettlementsStateAndLocal	52200000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Settlements State And Local IncomeTaxReconciliationTaxSettlementsStateAndLocal	19700000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Settlements State And Local IncomeTaxReconciliationTaxSettlementsStateAndLocal	54700000	USD
CY2019	aep	Increase Decrease In Income Taxes Due To Removal Costs IncreaseDecreaseInIncomeTaxesDueToRemovalCosts	-20700000	USD
CY2018	aep	Increase Decrease In Income Taxes Due To Removal Costs IncreaseDecreaseInIncomeTaxesDueToRemovalCosts	-19800000	USD
CY2017	aep	Increase Decrease In Income Taxes Due To Removal Costs IncreaseDecreaseInIncomeTaxesDueToRemovalCosts	-32700000	USD
CY2019	aep	Increase Decrease In Income Taxes Afudc IncreaseDecreaseInIncomeTaxesAfudc	-37100000	USD
CY2018	aep	Increase Decrease In Income Taxes Afudc IncreaseDecreaseInIncomeTaxesAfudc	-29400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	3246100000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2750800000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	10834300000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	9837300000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	7588200000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	7086500000	USD
CY2019Q4	aep	Deferred Tax Assets Liabilities Net Property Related Temporary Differences DeferredTaxAssetsLiabilitiesNetPropertyRelatedTemporaryDifferences	6602900000	USD
CY2018Q4	aep	Deferred Tax Assets Liabilities Net Property Related Temporary Differences DeferredTaxAssetsLiabilitiesNetPropertyRelatedTemporaryDifferences	6224800000	USD
CY2019Q4	aep	Amounts Due From Customers For Future Federal Income Taxes AmountsDueFromCustomersForFutureFederalIncomeTaxes	-1173500000	USD
CY2017	aep	Increase Decrease In Income Taxes Afudc IncreaseDecreaseInIncomeTaxesAfudc	-37400000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-1800000	USD
CY2019	aep	Tax Reform Adjustments TaxReformAdjustments	0	USD
CY2018	aep	Tax Reform Adjustments TaxReformAdjustments	-10900000	USD
CY2017	aep	Tax Reform Adjustments TaxReformAdjustments	-26700000	USD
CY2019	aep	Increase Decrease In Income Taxes Due To Tax Reserve Adjustments IncreaseDecreaseInIncomeTaxesDueToTaxReserveAdjustments	0	USD
CY2018	aep	Increase Decrease In Income Taxes Due To Tax Reserve Adjustments IncreaseDecreaseInIncomeTaxesDueToTaxReserveAdjustments	0	USD
CY2017	aep	Increase Decrease In Income Taxes Due To Tax Reserve Adjustments IncreaseDecreaseInIncomeTaxesDueToTaxReserveAdjustments	-35800000	USD
CY2019	aep	Tax Reform Excess Adit Reversal TaxReformExcessADITReversal	-353200000	USD
CY2018	aep	Tax Reform Excess Adit Reversal TaxReformExcessADITReversal	-257200000	USD
CY2017	aep	Tax Reform Excess Adit Reversal TaxReformExcessADITReversal	0	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-5000000.0	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-10200000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-6500000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-12900000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	115300000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	969700000	USD
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.007
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.056
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.335
CY2018Q4	aep	Amounts Due From Customers For Future Federal Income Taxes AmountsDueFromCustomersForFutureFederalIncomeTaxes	-1329700000	USD
CY2019Q4	aep	Deferred State Income Taxes DeferredStateIncomeTaxes	1112400000	USD
CY2018Q4	aep	Deferred State Income Taxes DeferredStateIncomeTaxes	1072500000	USD
CY2019Q4	aep	Deferred Tax Assets Liabilities Securitized Transition Assets DeferredTaxAssetsLiabilitiesSecuritizedTransitionAssets	178700000	USD
CY2018Q4	aep	Deferred Tax Assets Liabilities Securitized Transition Assets DeferredTaxAssetsLiabilitiesSecuritizedTransitionAssets	186600000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	371100000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	454100000	USD
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CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	-453700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	77600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	78300000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	247200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	113700000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	446600000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	300500000	USD
CY2019Q4	aep	All Other Net AllOtherNet	0	USD
CY2018Q4	aep	All Other Net AllOtherNet	-84000000.0	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	7588200000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	7086500000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14600000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	8800000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2100000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2800000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	24100000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	86600000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	100000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	71000000.0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1100000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14600000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	98800000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4500000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	28000000.0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3400000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	-7900000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	86600000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	16400000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	70700000	USD
CY2019	aep	Noncash Acquisitions Under Operating Leases NoncashAcquisitionsUnderOperatingLeases	125000000.0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	20300000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	11600000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	10500000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	286000000.0	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	70800000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	16400000	USD
CY2019	aep	Total Lease Rental Costs TotalLeaseRentalCosts	373200000	USD
CY2018	us-gaap	Operating Lease Cost OperatingLeaseCost	245000000.0	USD
CY2018	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	62400000	USD
CY2018	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	16400000	USD
CY2018	aep	Total Lease Rental Costs TotalLeaseRentalCosts	323800000	USD
CY2017	us-gaap	Operating Lease Cost OperatingLeaseCost	231300000	USD
CY2017	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	66300000	USD
CY2017	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	16700000	USD
CY2017	aep	Total Lease Rental Costs TotalLeaseRentalCosts	314300000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y2M23D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P5Y10M6D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0360
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0598
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	284700000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	303100000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	306800000	USD
CY2018Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	278800000	USD
CY2018Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	289000000.0	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	734600000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	234100000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	968700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	72700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	64900000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	56400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	49600000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	57400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling After Year Five FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive	64400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	365400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	58600000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	306800000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	269900000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	253600000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	245600000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	74800000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	62000000.0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	169700000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	1075600000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	106900000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	968700000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	70800000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	60200000	USD
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CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	43800000	USD
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CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	90200000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	352200000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	63200000	USD
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CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	259600000	USD
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CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	20205046	shares
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CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	20204160	shares
CY2019	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	923595	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	514373631	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	20204160	shares
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CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1598700000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	2022700000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	3014600000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	739900000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	706500000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	18863100000	USD
CY2019Q4	us-gaap	Unsecured Debt UnsecuredDebt	21180700000	USD
CY2018Q4	us-gaap	Unsecured Debt UnsecuredDebt	18903300000	USD
CY2019Q4	us-gaap	Longterm Pollution Control Bond Current And Noncurrent LongtermPollutionControlBondCurrentAndNoncurrent	1998800000	USD
CY2018Q4	us-gaap	Longterm Pollution Control Bond Current And Noncurrent LongtermPollutionControlBondCurrentAndNoncurrent	1643800000	USD
CY2019Q4	us-gaap	Other Notes Payable OtherNotesPayable	234300000	USD
CY2018Q4	us-gaap	Other Notes Payable OtherNotesPayable	204700000	USD
CY2019Q4	us-gaap	Secured Debt SecuredDebt	1025100000	USD
CY2018Q4	us-gaap	Secured Debt SecuredDebt	1111400000	USD
CY2019Q4	us-gaap	Spent Nuclear Fuel Obligation Noncurrent SpentNuclearFuelObligationNoncurrent	279800000	USD
CY2018Q4	us-gaap	Spent Nuclear Fuel Obligation Noncurrent SpentNuclearFuelObligationNoncurrent	273600000	USD
CY2019Q4	us-gaap	Junior Subordinated Notes JuniorSubordinatedNotes	787800000	USD
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CY2019Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	1219000000.0	USD
CY2018Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	1209900000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	26725500000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	26945500000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	220000000.0	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	26725500000	USD
CY2019Q4	aep	Auction Rate Tax Exempt Long Term Debt Outstanding AuctionRateTaxExemptLongTermDebtOutstanding	35000000	USD
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CY2019Q4	us-gaap	Commercial Paper CommercialPaper	2110000000.0	USD
CY2018Q4	us-gaap	Commercial Paper CommercialPaper	1160000000.0	USD
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CY2018Q4	us-gaap	Notes Payable NotesPayable	0	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	2838300000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	1910000000.0	USD
CY2019	aep	Net Uncollectible Accounts Receivable Written Off NetUncollectibleAccountsReceivableWrittenOff	26600000	USD
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CY2019Q4	us-gaap	Principal Amount Outstanding On Loans Held For Sale Or Securitization PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization	710000000.0	USD
CY2018Q4	us-gaap	Principal Amount Outstanding On Loans Held For Sale Or Securitization PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization	750000000.0	USD
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CY2019Q4	aep	Bad Debt Reserves Related To Securitized Sale Of Accounts Receivable BadDebtReservesRelatedToSecuritizedSaleOfAccountsReceivable	32100000	USD
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CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	10000000	shares
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CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	60138100000	USD
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CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	93700000	USD
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CY2019Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	1730000000	USD
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CY2019Q4	us-gaap	Asset Retirement Obligation Legally Restricted Assets Fair Value AssetRetirementObligationLegallyRestrictedAssetsFairValue	2650000000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation Legally Restricted Assets Fair Value AssetRetirementObligationLegallyRestrictedAssetsFairValue	2160000000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	2355500000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	102500000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	12000000.0	USD
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CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	67000000.0	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	2418900000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	2005700000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	87000000.0	USD
CY2018	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	342300000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	2355500000	USD
CY2019Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	1730000000	USD
CY2018Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	1660000000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	168400000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	132500000	USD
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	93700000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	73600000	USD
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	48600000	USD
CY2019Q4	us-gaap	Jointly Owned Utility Plant Gross Ownership Amount Of Plant In Service JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService	3019300000	USD
CY2019Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress	19100000	USD
CY2019Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Plant Accumulated Depreciation JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation	1051900000	USD
CY2018Q4	us-gaap	Jointly Owned Utility Plant Gross Ownership Amount Of Plant In Service JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService	3015900000	USD
CY2018Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress	24600000	USD
CY2018Q4	us-gaap	Jointly Owned Utility Plant Ownership Amount Of Plant Accumulated Depreciation JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation	984200000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.07
CY2018Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.17
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.74
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	88700000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	52500000	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018Q4	us-gaap	Goodwill Goodwill	52500000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q4	us-gaap	Goodwill Goodwill	52500000	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	456700000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	454400000	USD
CY2018Q2	us-gaap	Revenues Revenues	4013200000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	757000000.0	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	530100000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	528400000	USD
CY2018Q3	us-gaap	Revenues Revenues	4333100000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	668600000	USD
CY2019	us-gaap	Revenues Revenues	15561400000	USD
CY2018	us-gaap	Revenues Revenues	16195700000	USD
CY2019Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1497900000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	577600000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	363400000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.92
CY2019Q1	us-gaap	Revenues Revenues	4056800000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	788400000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	574100000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	572800000	USD
CY2019Q2	us-gaap	Revenues Revenues	3573600000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	551000000.0	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	459100000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	461300000	USD
CY2019Q3	us-gaap	Revenues Revenues	4315000000.0	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	958200000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	733900000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	733500000	USD
CY2019Q4	us-gaap	Revenues Revenues	3616000000.0	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	294700000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	152700000	USD
CY2019Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	153500000	USD
CY2018Q1	us-gaap	Revenues Revenues	4048300000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	706000000.0	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.49
CY2019Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.31
CY2018Q3	us-gaap	Profit Loss ProfitLoss	579700000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	577600000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.16
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.93
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.48
CY2018Q4	us-gaap	Revenues Revenues	3801100000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	551100000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	364800000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	363400000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	572800000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	461300000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.31
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	454400000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	528400000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	733500000	USD
CY2019Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	153500000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.16
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.93
CY2018Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.92
CY2018Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.07
CY2018Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.17
CY2018Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.74

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$AEP
AMERICAN ELECTRIC POWER CO INC Stock $aep

2019 Q4 Form 10-K Financial Statement

#000000490420000007 Filed on February 20, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AEP AMERICAN ELECTRIC POWER CO INC Stock $aep

2019 Q4 Form 10-K Financial Statement

#000000490420000007 Filed on February 20, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AEP
AMERICAN ELECTRIC POWER CO INC Stock $aep