$AEE
AMEREN CORP Stock $aee

$aee Overview Financials Valuation SEC Filings Company Website

2013 Form 10-K Financial Statement

#000100291014000054 Filed on March 03, 2014

Income Statement

Concept	2013	2012 Q4	2012 Q3
Revenue	$5.838B	$1.258B	$1.709B
YoY Change	0.99%	-2.93%	-8.9%
Cost Of Revenue	$1.028B	$318.0M	$300.0M
YoY Change	-17.89%	-2.75%	-20.63%
Gross Profit	$4.810B	$940.0M	$1.409B
YoY Change	6.2%	-24.86%	-25.45%
Gross Profit Margin	82.39%	74.72%	82.45%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$666.0M	$167.0M	$152.0M
YoY Change	5.21%	279.55%	-17.84%
% of Gross Profit	13.85%	17.77%	10.79%
Operating Expenses	$4.654B	$832.0M	$1.131B
YoY Change	1.33%	-24.5%	-34.17%
Operating Profit	$1.184B	$112.0M	$570.0M
YoY Change	-0.34%	23.08%	15.38%
Interest Expense	$398.0M	-$90.00M	$99.00M
YoY Change	1.53%	-15.89%	-12.39%
% of Operating Profit	33.61%	-80.36%	17.37%
Other Income/Expense, Net	$43.00M	$1.000M	$11.00M
YoY Change	30.3%	-50.0%	-15.38%
Pretax Income	$829.0M	$19.00M	$490.0M
YoY Change	0.0%	-55.81%	8.89%
Income Tax	$311.0M	$9.000M	$179.0M
% Of Pretax Income	37.52%	47.37%	36.53%
Net Earnings	$289.0M	-$1.156B	$374.0M
YoY Change	-129.67%	-4724.0%	31.23%
Net Earnings / Revenue	4.95%	-91.89%	21.88%
Basic Earnings Per Share	$1.19	-$4.76	$1.54
Diluted Earnings Per Share	$1.18	-$4.76	$1.54
COMMON SHARES
Basic Shares Outstanding	242.6M shares	242.6M shares	242.6M shares
Diluted Shares Outstanding	244.5M shares		242.9M shares

Balance Sheet

Concept	2013	2012 Q4	2012 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$30.00M	$184.0M	$298.0M
YoY Change	-83.7%	-27.84%	-42.91%
Cash & Equivalents	$30.00M	$209.0M	$273.0M
Short-Term Investments
Other Short-Term Assets	$816.0M	$98.00M	$98.00M
YoY Change	-66.24%	-35.1%	-86.04%
Inventory	$526.0M	$570.0M	$756.0M
Prepaid Expenses
Receivables	$404.0M	$354.0M	$523.0M
Other Receivables	$196.0M	$71.00M	$82.00M
Total Short-Term Assets	$1.972B	$3.596B	$2.406B
YoY Change	-45.16%	-37.32%	-10.22%
LONG-TERM ASSETS
Property, Plant & Equipment	$16.21B	$15.35B	$17.83B
YoY Change	5.58%	3.37%	-0.22%
Goodwill		$411.0M	$411.0M
YoY Change		0.0%
Intangibles		$14.00M	$14.00M
YoY Change		100.0%
Long-Term Investments	$494.0M	$408.0M	$407.0M
YoY Change	21.08%	14.29%	23.33%
Other Assets	$1.938B	$667.0M	$772.0M
YoY Change	-20.99%	-12.24%	-62.45%
Total Long-Term Assets	$19.07B	$18.63B	$21.09B
YoY Change	2.34%	3.6%	2.01%
TOTAL ASSETS
Total Short-Term Assets	$1.972B	$3.596B	$2.406B
Total Long-Term Assets	$19.07B	$18.63B	$21.09B
Total Assets	$21.04B	$22.23B	$23.50B
YoY Change	-5.34%	-6.29%	0.61%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$806.0M	$533.0M	$458.0M
YoY Change	51.22%	-23.09%	11.71%
Accrued Expenses	$86.00M	$89.00M	$145.0M
YoY Change	-3.37%	-11.88%	-8.81%
Deferred Revenue
YoY Change
Short-Term Debt	$368.0M		$5.000M
YoY Change			-98.57%
Long-Term Debt Due	$534.0M	$355.0M	$206.0M
YoY Change	50.42%	98.32%	15.73%
Total Short-Term Liabilities	$2.461B	$2.686B	$1.546B
YoY Change	-8.38%	-20.37%	-16.34%
LONG-TERM LIABILITIES
Long-Term Debt	$5.504B	$5.802B	$6.781B
YoY Change	-5.14%	-0.87%	1.48%
Other Long-Term Liabilities	$3.078B	$643.0M	$563.0M
YoY Change	-17.24%	51.65%	-82.91%
Total Long-Term Liabilities	$8.582B	$6.445B	$7.344B
YoY Change	-9.86%	2.68%	-26.38%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.461B	$2.686B	$1.546B
Total Long-Term Liabilities	$8.582B	$6.445B	$7.344B
Total Liabilities	$14.50B	$9.131B	$8.890B
YoY Change	-7.15%	-5.38%	-42.12%
SHAREHOLDERS EQUITY
Retained Earnings		$1.006B	$2.259B
YoY Change		-57.53%
Common Stock		$2.000M	$2.000M
YoY Change		0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$6.544B	$6.616B	$7.874B
YoY Change
Total Liabilities & Shareholders Equity	$21.04B	$22.23B	$23.50B
YoY Change	-5.34%	-6.29%	0.61%

Cashflow Statement

Concept	2013	2012 Q4	2012 Q3
OPERATING ACTIVITIES
Net Income	$289.0M	-$1.156B	$374.0M
YoY Change	-129.67%	-4724.0%	31.23%
Depreciation, Depletion And Amortization	$666.0M	$167.0M	$152.0M
YoY Change	5.21%	279.55%	-17.84%
Cash From Operating Activities	$1.693B	$378.0M	$551.0M
YoY Change	0.18%	20.77%	-17.27%
INVESTING ACTIVITIES
Capital Expenditures	$1.379B	-$336.0M	-$281.0M
YoY Change	29.73%	140.0%	6.84%
Acquisitions
YoY Change
Other Investing Activities	-$1.000M	-$12.00M	-$68.00M
YoY Change	-95.0%	-92.36%	-1233.33%
Cash From Investing Activities	-$1.723B	-$348.0M	-$349.0M
YoY Change	31.53%	17.17%	35.8%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$0.00
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$149.0M	-119.0M	-2.000M
YoY Change	-65.02%	-57.95%	-99.25%
NET CHANGE
Cash From Operating Activities	$1.693B	378.0M	551.0M
Cash From Investing Activities	-$1.723B	-348.0M	-349.0M
Cash From Financing Activities	-$149.0M	-119.0M	-2.000M
Net Change In Cash	-$179.0M	-89.00M	200.0M
YoY Change	289.13%	-66.67%	38.89%
FREE CASH FLOW
Cash From Operating Activities	$1.693B	$378.0M	$551.0M
Capital Expenditures	$1.379B	-$336.0M	-$281.0M
Free Cash Flow	$314.0M	$714.0M	$832.0M
YoY Change	-49.92%	57.62%	-10.44%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2013	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.04
CY2013	aee	Comprehensive Income Loss From Continuing Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	548000000	USD
CY2013Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	806000000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	354000000	USD
CY2013Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	404000000	USD
CY2012Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	70000000	USD
CY2013Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	63000000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8346000000	USD
CY2013Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8644000000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	3000000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-8000000	USD
CY2013Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	122000000	USD
CY2012Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	155000000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	5616000000	USD
CY2013Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	5632000000	USD
CY2013	us-gaap	Adjustment For Amortization AdjustmentForAmortization	71000000	USD
CY2012	us-gaap	Adjustment For Amortization AdjustmentForAmortization	83000000	USD
CY2011	us-gaap	Adjustment For Amortization AdjustmentForAmortization	61000000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	22000000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20000000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13000000	USD
CY2013Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	18000000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	17000000	USD
CY2011	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	16000000	USD
CY2012	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	20000000	USD
CY2013	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	24000000	USD
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	700000	shares
CY2013	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100000	shares
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2013	us-gaap	Asset Impairment Charges AssetImpairmentCharges		USD
CY2012	us-gaap	Asset Impairment Charges AssetImpairmentCharges		USD
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	349000000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	331000000	USD
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CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	18000000	USD
CY2013	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	19000000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred		USD
CY2013	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	1000000	USD
CY2013	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	1000000	USD
CY2013	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	2000000	USD
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CY2012Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	435000000	USD
CY2013Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	165000000	USD
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CY2013Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	297000000	USD
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	281000000	USD
CY2013	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	4000000	USD
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CY2013	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations		USD
CY2012	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations		USD
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CY2012Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	61000000	USD
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CY2013Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
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CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	242600000	shares
CY2013Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	242600000	shares
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CY2013Q4	us-gaap	Common Stock Value CommonStockValue	2000000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	2000000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	486000000	USD
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CY2013	us-gaap	Concentration Risk Credit Risk Financial Instrument Maximum Exposure ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure	13000000	USD
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CY2012	us-gaap	Cost Of Goods Sold Depreciation Depletion And Amortization CostOfGoodsSoldDepreciationDepletionAndAmortization	673000000	USD
CY2013	us-gaap	Cost Of Goods Sold Depreciation Depletion And Amortization CostOfGoodsSoldDepreciationDepletionAndAmortization	706000000	USD
CY2011	us-gaap	Cost Of Goods Sold Depreciation Depletion And Amortization CostOfGoodsSoldDepreciationDepletionAndAmortization	643000000	USD
CY2011	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	570000000	USD
CY2012	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	472000000	USD
CY2013	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	526000000	USD
CY2013	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	502000000	USD
CY2012	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	780000000	USD
CY2011	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	952000000	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-118000000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-6000000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	40000000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	10000000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-2000000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	19000000	USD
CY2012Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	107000000	USD
CY2013Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	105000000	USD
CY2012Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	408000000	USD
CY2013Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	494000000	USD
CY2013Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	494000000	USD
CY2012Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	406000000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	204000000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	213000000	USD
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	368000000	USD
CY2011	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	262000000	USD
CY2013	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	410000000	USD
CY2012	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	257000000	USD
CY2013	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-6000000	USD
CY2012	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-7000000	USD
CY2011	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-6000000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	60000000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	48000000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	55000000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	170000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	106000000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	323000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	273000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	6000000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	6000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7000000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3016000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3060000000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	-28000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	-28000000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3186000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3166000000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	-250000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	-478000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3769000000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3550000000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	73000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	76000000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	1143000000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	461000000	USD
CY2013	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	19000000	USD
CY2012	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	633000000	USD
CY2013	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	666000000	USD
CY2011	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	602000000	USD
CY2012Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	7000000	USD
CY2013Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	3000000	USD
CY2012Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	226000000	USD
CY2013Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	145000000	USD
CY2011	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	145000000	USD
CY2013	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-210000000	USD
CY2012	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-2483000000	USD
CY2012	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-987000000	USD
CY2011	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	56000000	USD
CY2013	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	13000000	USD
CY2013Q4	us-gaap	Disposal Group Including Discontinued Operation Accounts Notes And Loans Receivable Net DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet	5000000	USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Accounts Notes And Loans Receivable Net DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet	102000000	USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Accounts Payable DisposalGroupIncludingDiscontinuedOperationAccountsPayable	141000000	USD
CY2013Q4	us-gaap	Disposal Group Including Discontinued Operation Accounts Payable DisposalGroupIncludingDiscontinuedOperationAccountsPayable	5000000	USD
CY2011Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	7000000	USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	25000000	USD
CY2013Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents		USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Assets DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssets	395000000	USD
CY2013Q4	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Assets DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssets	13000000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	56000000	USD
CY2013	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	39000000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	64000000	USD
CY2013Q4	us-gaap	Disposal Group Including Discontinued Operation Inventory DisposalGroupIncludingDiscontinuedOperationInventory	5000000	USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Inventory DisposalGroupIncludingDiscontinuedOperationInventory	135000000	USD
CY2013	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	1207000000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	1150000000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	3474000000	USD
CY2013	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-170000000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-2427000000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	208000000	USD
CY2013Q4	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets		USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	104000000	USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Other Current Liabilities DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities	28000000	USD
CY2013Q4	us-gaap	Disposal Group Including Discontinued Operation Other Current Liabilities DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities		USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	1047000000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	1358000000	USD
CY2013	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	1037000000	USD
CY2012Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	-7000000	USD
CY2013Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent		USD
CY2011Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent		USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.15
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-4.01
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.19
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-4.76
CY2013Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.39
CY2013Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.15
CY2013Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.25
CY2013Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.60
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.54
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.66
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.87
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.18
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-4.01
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.15
CY2013Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.60
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-4.76
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.54
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.66
CY2013Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.87
CY2013Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.15
CY2013Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.24
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.37
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.37
CY2013	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.38
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Deductions EffectiveIncomeTaxRateReconciliationDeductions	-0.01
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Deductions EffectiveIncomeTaxRateReconciliationDeductions
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	-0.01
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	-0.01
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.04
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.05
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.01
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	-0.01
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.01
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.01
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.01
CY2013	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	4832000000	USD
CY2011	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	5147000000	USD
CY2012	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	4857000000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Cash Flow Effect Cash Used To Settle Awards EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards	4000000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Cash Flow Effect Cash Used To Settle Awards EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards	11000000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Cash Flow Effect Cash Used To Settle Awards EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards	11000000	USD
CY2013Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	20000000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P20M
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	8000000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	5000000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	8000000	USD
CY2012Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	198000000	USD
CY2013Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	144000000	USD
CY2012Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	131000000	USD
CY2013Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	127000000	USD
CY2012	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	193000000	USD
CY2011	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	194000000	USD
CY2013	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	213000000	USD
CY2011Q2	us-gaap	Former Gain Contingency Recognized In Current Period FormerGainContingencyRecognizedInCurrentPeriod	11000000	USD
CY2012	us-gaap	Fuel Costs FuelCosts	714000000	USD
CY2013	us-gaap	Fuel Costs FuelCosts	845000000	USD
CY2011	us-gaap	Fuel Costs FuelCosts	866000000	USD
CY2013	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	1006000000	USD
CY2011	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	1001000000	USD
CY2012	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	924000000	USD
CY2013Q4	us-gaap	Goodwill Goodwill	411000000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	411000000	USD
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-223000000	USD
CY2012Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	304000000	USD
CY2013Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	299000000	USD
CY2012	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	516000000	USD
CY2013	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	512000000	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	431000000	USD
CY2013Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	54000000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	38000000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	164000000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	302000000	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	12000000	USD
CY2013Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	305000000	USD
CY2013Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	48000000	USD
CY2013Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	105000000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	6000000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	6000000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	6000000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	691000000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	829000000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	829000000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	518000000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	437000000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	522000000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.11
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.13
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.79
CY2013Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.19
CY2013Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.22
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.67
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.05
CY2013Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.44
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.25
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.16
CY2013Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.26
CY2012	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.13
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.79
CY2013	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.10
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.05
CY2013Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.44
CY2013Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.19
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.25
CY2013Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.22
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.16
CY2013Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.25
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.67
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-1496000000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	89000000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	-6000000	USD
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest		USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	1000000	USD
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-223000000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	88000000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-1490000000	USD
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1168000000	USD
CY2013Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	11000000	USD
CY2013Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	199000000	USD
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-72000000	USD
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-47000000	USD
CY2013Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	3000000	USD
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	441000000	USD
CY2013Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	10000000	USD
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.92
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-6.14
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.36
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.29
CY2013Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.05
CY2013Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.01
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-4.81
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-1.82
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.20
CY2013Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.04
CY2013Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.82
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.36
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.92
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-6.14
CY2013Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.04
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-1.82
CY2013Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.82
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-4.81
CY2013Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.01
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.20
CY2013Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.05
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.29
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	254000000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	307000000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	311000000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	33000000	USD
CY2013	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	32000000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-59000000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	33000000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	13000000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	36000000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1000000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-61000000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	8000000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-28000000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	81000000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-34000000	USD
CY2013	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-195000000	USD
CY2011	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-5000000	USD
CY2012	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-4000000	USD
CY2013	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	-41000000	USD
CY2011	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	-36000000	USD
CY2012	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	-41000000	USD
CY2011	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-100000000	USD
CY2012	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-23000000	USD
CY2013	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-28000000	USD
CY2013	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-60000000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	28000000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	29000000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2000000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	6000000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-85000000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	65000000	USD
CY2013	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	60000000	USD
CY2011	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-200000000	USD
CY2012	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-30000000	USD
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	400000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	600000	shares
CY2013	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1900000	shares
CY2012Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	14000000	USD
CY2013Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	22000000	USD
CY2012	us-gaap	Interest Expense InterestExpense	392000000	USD
CY2011	us-gaap	Interest Expense InterestExpense	387000000	USD
CY2013	us-gaap	Interest Expense InterestExpense	398000000	USD
CY2013Q4	us-gaap	Interest Payable Current InterestPayableCurrent	86000000	USD
CY2012	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	28000000	USD
CY2013	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	27000000	USD
CY2011	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	28000000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	433000000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	453000000	USD
CY2013	us-gaap	Interest Paid Net InterestPaidNet	393000000	USD
CY2012Q4	us-gaap	Interest Payable Current InterestPayableCurrent	89000000	USD
CY2012Q4	us-gaap	Inventory Net InventoryNet	570000000	USD
CY2013Q4	us-gaap	Inventory Net InventoryNet	526000000	USD
CY2013Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	11000000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	22230000000	USD
CY2013Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	21042000000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2686000000	USD
CY2013Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2461000000	USD
CY2012Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	1193000000	USD
CY2013Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	45000000	USD
CY2013Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	6391000000	USD
CY2012Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	6975000000	USD
CY2012Q2	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	39000000	USD
CY2013Q4	us-gaap	Long Term Debt LongTermDebt	6048000000	USD
CY2012Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	355000000	USD
CY2013Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	534000000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	3478000000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	534000000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	840000000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	681000000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	395000000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	120000000	USD
CY2013Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5504000000	USD
CY2012Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5802000000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	151000000	USD
CY2013Q4	us-gaap	Minority Interest MinorityInterest	142000000	USD
CY2012	us-gaap	Operating Expenses OperatingExpenses	4593000000	USD
CY2013	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:13px;text-indent:24px;font-size:10pt;"><font style="font-family:Arial Narrow;font-size:10pt;">Ameren, headquartered in St. Louis, Missouri, is a public utility holding company under PUHCA 2005, administered by FERC. Ameren’s primary assets are its equity interests in its subsidiaries. Ameren’s subsidiaries are separate, independent legal entities with separate businesses, assets, and liabilities. Dividends on Ameren’s common stock and the payment of other expenses by Ameren depend on distributions made to it by its subsidiaries. Ameren’s principal subsidiaries are listed below. </font></div><table cellpadding="0" cellspacing="0" style="padding-top:13px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><font style="font-family:Arial Narrow;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:Arial Narrow;font-size:10pt;">Union Electric Company, doing business as Ameren Missouri, operates a rate-regulated electric generation, transmission, and distribution business, and a rate-regulated natural gas transmission and distribution business in Missouri. Ameren Missouri was incorporated in Missouri in 1922 and is successor to a number of companies, the oldest of which was organized in 1881. It is the largest electric utility in the state of Missouri. It supplies electric and natural gas service to a </font><font style="font-family:Arial Narrow;font-size:10pt;color:#000000;text-decoration:none;">24,000</font><font style="font-family:Arial Narrow;font-size:10pt;">-square-mile area in central and eastern Missouri. This area has an estimated population of </font><font style="font-family:Arial Narrow;font-size:10pt;color:#000000;text-decoration:none;">2.8 million</font><font style="font-family:Arial Narrow;font-size:10pt;"> and includes the Greater St. Louis area. Ameren Missouri supplies electric service to </font><font style="font-family:Arial Narrow;font-size:10pt;color:#000000;text-decoration:none;">1.2 million</font><font style="font-family:Arial Narrow;font-size:10pt;"> customers and natural gas service to </font><font style="font-family:Arial Narrow;font-size:10pt;color:#000000;text-decoration:none;">127,000</font><font style="font-family:Arial Narrow;font-size:10pt;"> customers.</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><font style="font-family:Arial Narrow;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:Arial Narrow;font-size:10pt;">Ameren Illinois Company, doing business as Ameren Illinois, operates a rate-regulated electric and natural gas transmission and distribution business in Illinois. Ameren Illinois was created by the merger of CILCO and IP with and into CIPS in 2010. CIPS was incorporated in Illinois in 1923 and is the successor to a number of companies, the oldest of which was organized in 1902. Ameren Illinois supplies electric and natural gas utility service to portions of central and southern Illinois having an estimated population of </font><font style="font-family:Arial Narrow;font-size:10pt;color:#000000;text-decoration:none;">3.1 million</font><font style="font-family:Arial Narrow;font-size:10pt;"> in an area of </font><font style="font-family:Arial Narrow;font-size:10pt;color:#000000;text-decoration:none;">40,000</font><font style="font-family:Arial Narrow;font-size:10pt;"> square miles. Ameren Illinois supplies electric service to </font><font style="font-family:Arial Narrow;font-size:10pt;color:#000000;text-decoration:none;">1.2 million</font><font style="font-family:Arial Narrow;font-size:10pt;"> customers and natural gas service to </font><font style="font-family:Arial Narrow;font-size:10pt;color:#000000;text-decoration:none;">767,000</font><font style="font-family:Arial Narrow;font-size:10pt;"> customers.</font></div></td></tr></table><div style="line-height:120%;padding-top:13px;text-indent:24px;font-size:10pt;"><font style="font-family:Arial Narrow;font-size:10pt;">Ameren has various other subsidiaries responsible for activities such as the provision of shared services. Ameren also has a subsidiary, ATXI, that operates a FERC rate-regulated electric transmission business and is developing the Illinois Rivers project.</font></div><div style="line-height:120%;padding-top:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:Arial Narrow;font-size:10pt;"></font></div></div>
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-426000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-149000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1120000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-426000000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	1033000000	USD
CY2013Q3	us-gaap	Net Income Loss NetIncomeLoss	302000000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	-1156000000	USD
CY2013Q1	us-gaap	Net Income Loss NetIncomeLoss	-145000000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	211000000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	-403000000	USD
CY2013	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2011	us-gaap	Operating Expenses OperatingExpenses	5115000000	USD
CY2013	us-gaap	Operating Expenses OperatingExpenses	4654000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-1020000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-149000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1723000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1048000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1310000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1153000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-949000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1440000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1690000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1693000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1878000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1499000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1636000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1404000000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	519000000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	-974000000	USD
CY2013	us-gaap	Net Income Loss NetIncomeLoss	289000000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	374000000	USD
CY2013Q2	us-gaap	Net Income Loss NetIncomeLoss	95000000	USD
CY2013Q4	us-gaap	Net Income Loss NetIncomeLoss	37000000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	1184000000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	1188000000	USD
CY2013Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	185000000	USD
CY2013Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	171000000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	112000000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	159000000	USD
CY2013Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	261000000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	570000000	USD
CY2013Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	567000000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	347000000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	117000000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	14000000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	13000000	USD
CY2011	us-gaap	Other Income OtherIncome	3000000	USD
CY2012	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	4000000	USD
CY2011	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	3000000	USD
CY2013	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	3000000	USD
CY2013Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	194000000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	13000000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	13000000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	51000000	USD
CY2012Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	200000000	USD
CY2013Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	408000000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	98000000	USD
CY2013Q4	us-gaap	Other Assets Current OtherAssetsCurrent	85000000	USD
CY2013Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	698000000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	667000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	8000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-30000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	19000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-14000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	16000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-6000000	USD
CY2013	us-gaap	Other Income OtherIncome	2000000	USD
CY2012	us-gaap	Other Income OtherIncome	2000000	USD
CY2012Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	168000000	USD
CY2013Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	622000000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	643000000	USD
CY2013	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-23000000	USD
CY2011	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1000000	USD
CY2012	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	7000000	USD
CY2012	us-gaap	Other Noninterest Expense OtherNoninterestExpense	13000000	USD
CY2011	us-gaap	Other Noninterest Expense OtherNoninterestExpense	15000000	USD
CY2013	us-gaap	Other Noninterest Expense OtherNoninterestExpense	14000000	USD
CY2013	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	26000000	USD
CY2012	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	37000000	USD
CY2011	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	23000000	USD
CY2012	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	70000000	USD
CY2011	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	68000000	USD
CY2013	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	69000000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	45000000	USD
CY2013	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	43000000	USD
CY2012	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	33000000	USD
CY2013Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	196000000	USD
CY2012Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	71000000	USD
CY2013	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	2000000	USD
CY2012	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	16000000	USD
CY2011	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	0	USD
CY2011	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	62000000	USD
CY2012	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	91000000	USD
CY2013	us-gaap	Payments For Nuclear Fuel PaymentsForNuclearFuel	45000000	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2000000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-15000000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2000000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	382000000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	388000000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	375000000	USD
CY2013	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	6000000	USD
CY2012	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	6000000	USD
CY2011	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	6000000	USD
CY2012	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	403000000	USD
CY2011	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	220000000	USD
CY2013	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	214000000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	881000000	USD
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1379000000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1063000000	USD
CY2013Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	461000000	USD
CY2012Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	1143000000	USD
CY2012Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	1138000000	USD
CY2013Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	466000000	USD
CY2013Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	105.50
CY2013Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2013Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2013Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue	142000000	USD
CY2013Q4	us-gaap	Preferred Stock Value PreferredStockValue	142000000	USD
CY2012	us-gaap	Proceeds From Advances For Construction ProceedsFromAdvancesForConstruction	4000000	USD
CY2011	us-gaap	Proceeds From Advances For Construction ProceedsFromAdvancesForConstruction	5000000	USD
CY2013	us-gaap	Proceeds From Advances For Construction ProceedsFromAdvancesForConstruction	1000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	65000000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock		USD
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock		USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	278000000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	882000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt		USD
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	368000000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-148000000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-481000000	USD
CY2013	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	196000000	USD
CY2012	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	384000000	USD
CY2011	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	199000000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	-974000000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	526000000	USD
CY2013	us-gaap	Profit Loss ProfitLoss	295000000	USD
CY2013Q2	us-gaap	Profit Loss ProfitLoss	96000000	USD
CY2013Q1	us-gaap	Profit Loss ProfitLoss	-143000000	USD
CY2012Q1	us-gaap	Profit Loss ProfitLoss	-403000000	USD
CY2013Q3	us-gaap	Profit Loss ProfitLoss	304000000	USD
CY2012Q2	us-gaap	Profit Loss ProfitLoss	210000000	USD
CY2012Q3	us-gaap	Profit Loss ProfitLoss	374000000	USD
CY2013Q4	us-gaap	Profit Loss ProfitLoss	38000000	USD
CY2012Q4	us-gaap	Profit Loss ProfitLoss	-1155000000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	22796000000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	23701000000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	16205000000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	15348000000	USD
CY2013	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	37000000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	34000000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	36000000	USD
CY2013Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	255000000	USD
CY2012Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	241000000	USD
CY2011	us-gaap	Public Utilities Property Plant And Equipment Amount Of Indirect Disallowance Of Costs Of Recently Completed Plants PublicUtilitiesPropertyPlantAndEquipmentAmountOfIndirectDisallowanceOfCostsOfRecentlyCompletedPlants	89000000	USD
CY2012	us-gaap	Public Utilities Property Plant And Equipment Amount Of Indirect Disallowance Of Costs Of Recently Completed Plants PublicUtilitiesPropertyPlantAndEquipmentAmountOfIndirectDisallowanceOfCostsOfRecentlyCompletedPlants		USD
CY2013	us-gaap	Public Utilities Property Plant And Equipment Amount Of Indirect Disallowance Of Costs Of Recently Completed Plants PublicUtilitiesPropertyPlantAndEquipmentAmountOfIndirectDisallowanceOfCostsOfRecentlyCompletedPlants		USD
CY2012Q4	us-gaap	Regulated Entity Other Assets Noncurrent RegulatedEntityOtherAssetsNoncurrent	3286000000	USD
CY2013Q4	us-gaap	Regulated Entity Other Assets Noncurrent RegulatedEntityOtherAssetsNoncurrent	2865000000	USD
CY2013Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	156000000	USD
CY2012Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	247000000	USD
CY2013Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1240000000	USD
CY2012Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1786000000	USD
CY2012Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	100000000	USD
CY2013Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	216000000	USD
CY2012Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1589000000	USD
CY2013Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1705000000	USD
CY2013	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	399000000	USD
CY2011	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	155000000	USD
CY2012	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	760000000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1006000000	USD
CY2013Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	907000000	USD
CY2013	us-gaap	Revenues Revenues	5838000000	USD
CY2012	us-gaap	Revenues Revenues	5781000000	USD
CY2011	us-gaap	Revenues Revenues	6148000000	USD
CY2013Q4	us-gaap	Revenues Revenues	1322000000	USD
CY2012Q3	us-gaap	Revenues Revenues	1709000000	USD
CY2012Q2	us-gaap	Revenues Revenues	1402000000	USD
CY2013Q1	us-gaap	Revenues Revenues	1475000000	USD
CY2013Q3	us-gaap	Revenues Revenues	1638000000	USD
CY2013Q2	us-gaap	Revenues Revenues	1403000000	USD
CY2012Q1	us-gaap	Revenues Revenues	1412000000	USD
CY2012Q4	us-gaap	Revenues Revenues	1258000000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	17000000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	29000000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	27000000	USD
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	4000000	shares
CY2012Q4	us-gaap	Short Term Borrowings ShortTermBorrowings		USD
CY2013Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	368000000	USD
CY2013	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues		shares
CY2012	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	0	shares
CY2011	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	2200000	shares
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	6616000000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	6544000000	USD
CY2013Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6686000000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6767000000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8068000000	USD
CY2012Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	109000000	USD
CY2013Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	118000000	USD
CY2013	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	458000000	USD
CY2012	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	443000000	USD
CY2011	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	433000000	USD
CY2013Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	55000000	USD
CY2012Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	49000000	USD
CY2013Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	304000000	USD
CY2012Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	291000000	USD
CY2014Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	48000000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	90000000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	246000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	148000000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	156000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	103000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	13000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	125000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	143000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	10000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities		USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	17000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	17000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	69000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	22000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	5000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	7000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	5000000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	6000000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	1000000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	17000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	-1000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	5000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	11000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	-1000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1000000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	54000000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1000000	USD
CY2013Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	313000000	USD
CY2013Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	1519000000	USD
CY2013Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	888000000	USD
CY2013Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	1195000000	USD
CY2013Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	993000000	USD
CY2013Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	6349000000	USD
CY2011	aee	Comprehensive Income Loss From Continuing Operations Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxAttributableToNoncontrollingInterest	6000000	USD
CY2013	aee	Comprehensive Income Loss From Continuing Operations Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxAttributableToNoncontrollingInterest	6000000	USD
CY2013Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	1441000000	USD
CY2013	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	1617000000	USD
CY2012	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	1511000000	USD
CY2011	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	1562000000	USD
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	242100000	shares
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	244500000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	243000000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	242600000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	242600000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	241500000	shares
CY2013Q4	aee	Accumulated Depreciation Capital Lease AccumulatedDepreciationCapitalLease	56000000	USD
CY2012Q4	aee	Accumulated Depreciation Capital Lease AccumulatedDepreciationCapitalLease	52000000	USD
CY2013	aee	Actual Return In Excess Of Or Less Than Expected Return Percentage ActualReturnInExcessOfOrLessThanExpectedReturnPercentage	0.25
CY2013	aee	Aggregate Maximum Assessment Per Incident Under Price Andersen Liability Provisions Of Atomic Energy Act AggregateMaximumAssessmentPerIncidentUnderPriceAndersenLiabilityProvisionsOfAtomicEnergyAct	128000000	USD
CY2013	aee	Aggregate Nuclear Power Industry Insurance Policy Limit For Losses From Terrorist Attacks Within Twelve Month Period AggregateNuclearPowerIndustryInsurancePolicyLimitForLossesFromTerroristAttacksWithinTwelveMonthPeriod	3240000000	USD
CY2013	aee	Amount Gain Loss On Derivative Instruments That Qualify For Regulatory Deferral Net AmountGainLossOnDerivativeInstrumentsThatQualifyForRegulatoryDeferralNet	56000000	USD
CY2012	aee	Amount Gain Loss On Derivative Instruments That Qualify For Regulatory Deferral Net AmountGainLossOnDerivativeInstrumentsThatQualifyForRegulatoryDeferralNet	-112000000	USD
CY2013	aee	Amount Of Additional Weekly Indemnity Coverage Commencing After Initial Indemnity Coverage AmountOfAdditionalWeeklyIndemnityCoverageCommencingAfterInitialIndemnityCoverage	3600000	USD
CY2013	aee	Amount Of Coverage In Excess Of Primary Property Liability Coverage AmountOfCoverageInExcessOfPrimaryPropertyLiabilityCoverage	2250000000.00	USD
CY2013	aee	Amount Of Secondary Weekly Indemnity Coverage For Prolonged Nuclear Plant Outage In Excess Of Primary Indemnity Coverage AmountOfSecondaryWeeklyIndemnityCoverageForProlongedNuclearPlantOutageInExcessOfPrimaryIndemnityCoverage	900000	USD
CY2013	aee	Amount Of Weekly Indemnity Coverage Commencing Eight Weeks After Power Outage AmountOfWeeklyIndemnityCoverageCommencingEightWeeksAfterPowerOutage	4500000	USD
CY2013	aee	Amount Of Weekly Indemnity Coverage Thereafter Not Exceeding Policy Limit AmountOfWeeklyIndemnityCoverageThereafterNotExceedingPolicyLimit	490000000	USD
CY2012	aee	Annual Decommissioning Costs Included In Costs Of Service AnnualDecommissioningCostsIncludedInCostsOfService	7000000	USD
CY2011	aee	Annual Decommissioning Costs Included In Costs Of Service AnnualDecommissioningCostsIncludedInCostsOfService	7000000	USD
CY2013Q4	aee	Annual Obligation For Real Estate Leases And Railroad Licenses AnnualObligationForRealEstateLeasesAndRailroadLicenses	2000000	USD
CY2013Q4	aee	Capital And Operating Lease Obligations Due CapitalAndOperatingLeaseObligationsDue	416000000	USD
CY2013Q4	aee	Capital And Operating Lease Obligations Due Current CapitalAndOperatingLeaseObligationsDueCurrent	19000000	USD
CY2013Q4	aee	Capital And Operating Lease Obligations Due In Year Four CapitalAndOperatingLeaseObligationsDueInYearFour	19000000	USD
CY2013Q4	aee	Capital And Operating Lease Obligations Due In Year One CapitalAndOperatingLeaseObligationsDueInYearOne	19000000	USD
CY2013Q4	aee	Capital And Operating Lease Obligations Due In Year Three CapitalAndOperatingLeaseObligationsDueInYearThree	19000000	USD
CY2013Q4	aee	Capital And Operating Lease Obligations Due In Year Two CapitalAndOperatingLeaseObligationsDueInYearTwo	19000000	USD
CY2013Q4	aee	Capital And Operating Lease Obligations Due Thereafter CapitalAndOperatingLeaseObligationsDueThereafter	321000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Interest Included In Payments Current CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsCurrent	27000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Interest Included In Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsDueInFiveYears	26000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Interest Included In Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsDueInFourYears	27000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Interest Included In Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsDueInThreeYears	27000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Interest Included In Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsDueInTwoYears	27000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Interest Included In Payments Thereafter CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsThereafter	123000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments Current CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsCurrent	5000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInFiveYears	6000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInFourYears	6000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInThreeYears	6000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsDueInTwoYears	6000000	USD
CY2013Q4	aee	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments Thereafter CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsThereafter	270000000	USD
CY2013	aee	Maximum Annual Payment In Calendar Year Per Reactor Incident Under Price Andersen Liability Provisions Of Atomic Energy Act MaximumAnnualPaymentInCalendarYearPerReactorIncidentUnderPriceAndersenLiabilityProvisionsOfAtomicEnergyAct	19000000	USD
CY2013	aee	Maximum Annual Payment Per Incident At Licensed Commercia Lnuclear Reactor MaximumAnnualPaymentPerIncidentAtLicensedCommerciaLnuclearReactor	19000000	USD
CY2012	aee	Generator Advances For Construction Refunded Net Of Receipts GeneratorAdvancesForConstructionRefundedNetOfReceipts		USD
CY2012	aee	Comprehensive Income Loss From Continuing Operations Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxAttributableToNoncontrollingInterest	6000000	USD
CY2011	aee	Comprehensive Income Loss From Continuing Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	418000000	USD
CY2012Q4	aee	Disposal Group Including Discontinued Operation Derivative Liabilities Current DisposalGroupIncludingDiscontinuedOperationDerivativeLiabilitiesCurrent	63000000	USD
CY2012Q4	aee	Disposal Group Including Discontinued Operation Long Term Debt Current DisposalGroupIncludingDiscontinuedOperationLongTermDebtCurrent	824000000	USD
CY2013Q4	aee	Disposal Group Including Discontinued Operation Long Term Debt Current DisposalGroupIncludingDiscontinuedOperationLongTermDebtCurrent		USD
CY2012Q4	aee	Disposal Group Including Discontinued Operation Noncontrolling Interest DisposalGroupIncludingDiscontinuedOperationNoncontrollingInterest	8000000	USD
CY2012	aee	Comprehensive Income Loss From Continuing Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	514000000	USD
CY2012	aee	Comprehensive Income Loss From Continuing Operations Net Of Tax Portion Attributable To Parent ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxPortionAttributableToParent	508000000	USD
CY2011	aee	Comprehensive Income Loss From Continuing Operations Net Of Tax Portion Attributable To Parent ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxPortionAttributableToParent	412000000	USD
CY2013	aee	Comprehensive Income Loss From Continuing Operations Net Of Tax Portion Attributable To Parent ComprehensiveIncomeLossFromContinuingOperationsNetOfTaxPortionAttributableToParent	542000000	USD
CY2013	aee	Comprehensive Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	1000000	USD
CY2011	aee	Comprehensive Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	-5000000	USD
CY2012	aee	Comprehensive Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	2000000	USD
CY2012	aee	Comprehensive Income Loss From Discontinued Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-1438000000	USD
CY2011	aee	Comprehensive Income Loss From Discontinued Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	69000000	USD
CY2013	aee	Comprehensive Income Loss From Discontinued Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-241000000	USD
CY2012	aee	Comprehensive Income Loss From Discontinued Operations Net Of Tax Portion Attributable To Parent ComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxPortionAttributableToParent	-1440000000	USD
CY2011	aee	Comprehensive Income Loss From Discontinued Operations Net Of Tax Portion Attributable To Parent ComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxPortionAttributableToParent	74000000	USD
CY2013	aee	Comprehensive Income Loss From Discontinued Operations Net Of Tax Portion Attributable To Parent ComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxPortionAttributableToParent	-242000000	USD
CY2013	aee	Debt Default Provision Excess DebtDefaultProvisionExcess	25000000	USD
CY2013Q4	aee	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Changein Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationChangeinDiscountRate	0.0075
CY2013Q4	aee	Defined Benefit Plan Estimated Future Employer Contributions Over Next Five Years DefinedBenefitPlanEstimatedFutureEmployerContributionsOverNextFiveYears	270000000	USD
CY2013	aee	Defined Benefit Plan Expected Return On Plan Assets Period DefinedBenefitPlanExpectedReturnOnPlanAssetsPeriod	P4Y
CY2013	aee	Defined Benefit Plan Future Amortization Of Prior Service Cost Credit Period DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCreditPeriod	P10Y
CY2013	aee	Defined Benefit Plan Number Of High Quality Bonds Used To Determine Yield Curve DefinedBenefitPlanNumberOfHighQualityBondsUsedToDetermineYieldCurve	500	bond
CY2013Q4	aee	Department Of Energy Investing Funding Support Number Of Small Modular Reactor Designs DepartmentOfEnergyInvestingFundingSupportNumberOfSmallModularReactorDesigns	2
CY2012Q4	aee	Department Of Energy Investing Funding Support Number Of Small Modular Reactor Designs Awarded DepartmentOfEnergyInvestingFundingSupportNumberOfSmallModularReactorDesignsAwarded	1
CY2013	aee	Department Of Energy Investing Funding Support Period DepartmentOfEnergyInvestingFundingSupportPeriod	P5Y
CY2012Q4	aee	Derivative Liabilities Current Carrying Amount DerivativeLiabilitiesCurrentCarryingAmount	92000000	USD
CY2013Q4	aee	Derivative Liabilities Current Carrying Amount DerivativeLiabilitiesCurrentCarryingAmount	52000000	USD
CY2013Q4	aee	Derivative Potential Loss DerivativePotentialLoss	6000000	USD
CY2012Q4	aee	Derivative Potential Loss DerivativePotentialLoss	15000000	USD
CY2013Q4	aee	Guarantees Outstanding GuaranteesOutstanding	190000000	USD
CY2013	aee	Disclosure Of Accrued Capital Expenditures Excluded From Statements Of Cash Flow DisclosureOfAccruedCapitalExpendituresExcludedFromStatementsOfCashFlow	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-left:4px;padding-top:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:Arial Narrow;font-size:10pt;">The following table provides accrued capital and nuclear fuel expenditures at </font><font style="font-family:Arial Narrow;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2013</font><font style="font-family:Arial Narrow;font-size:10pt;">, </font><font style="font-family:Arial Narrow;font-size:10pt;color:#000000;text-decoration:none;">2012</font><font style="font-family:Arial Narrow;font-size:10pt;">, and </font><font style="font-family:Arial Narrow;font-size:10pt;color:#000000;text-decoration:none;">2011</font><font style="font-family:Arial Narrow;font-size:10pt;">, which represent noncash investing activity excluded from the accompanying statements of cash flows:</font></div><div style="line-height:100%;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:93.0672268907563%;border-collapse:collapse;text-align:left;"><tr><td colspan="12" rowspan="1"></td></tr><tr><td width="53%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="13%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="13%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td><td width="13%" rowspan="1" colspan="1"></td><td width="1%" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:2px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:2px solid #000000;" rowspan="1"><div style="font-family:Arial Narrow;text-align:center;font-size:10pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Ameren</font><font style="font-family:Arial Narrow;font-size:10pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:6pt">(a)</sup></font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:2px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:2px solid #000000;" rowspan="1"><div style="font-family:Arial Narrow;text-align:center;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Ameren</font></div><div style="font-family:Arial Narrow;text-align:center;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Missouri</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:2px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:2px solid #000000;" rowspan="1"><div style="font-family:Arial Narrow;text-align:center;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Ameren</font></div><div style="font-family:Arial Narrow;text-align:center;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Illinois</font></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">Accrued capital expenditures:</font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">2013</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">175</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">74</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">86</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">2012</font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">107</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">63</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">37</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">2011</font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">97</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">73</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">18</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">Accrued nuclear fuel expenditures:</font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">2013</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">8</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">8</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">(b)</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">2012</font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">8</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">8</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">(b)</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:top;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">2011</font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">36</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">36</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">(b)</font></div></td><td style="vertical-align:bottom;border-bottom:2px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr></table></div><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><table cellpadding="0" cellspacing="0" style="padding-top:5px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:8pt;padding-left:0px;"><font style="font-family:Arial Narrow;font-size:8pt;">(a)</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">Includes amounts for Ameren registrant and nonregistrant subsidiaries.</font></div></td></tr></table></div>
CY2013Q4	aee	Disposal Group Including Discontinued Operation Accumulated Other Comprehensive Gain Loss DisposalGroupIncludingDiscontinuedOperationAccumulatedOtherComprehensiveGainLoss		USD
CY2012Q4	aee	Disposal Group Including Discontinued Operation Accumulated Other Comprehensive Gain Loss DisposalGroupIncludingDiscontinuedOperationAccumulatedOtherComprehensiveGainLoss	19000000	USD
CY2012Q4	aee	Disposal Group Including Discontinued Operation Asset Retirement Obligations Current DisposalGroupIncludingDiscontinuedOperationAssetRetirementObligationsCurrent	97000000	USD
CY2013Q4	aee	Disposal Group Including Discontinued Operation Asset Retirement Obligations Current DisposalGroupIncludingDiscontinuedOperationAssetRetirementObligationsCurrent	40000000	USD
CY2012Q4	aee	Disposal Group Including Discontinued Operation Derivative Assets Current DisposalGroupIncludingDiscontinuedOperationDerivativeAssetsCurrent	102000000	USD
CY2013Q4	aee	Disposal Group Including Discontinued Operation Derivative Assets Current DisposalGroupIncludingDiscontinuedOperationDerivativeAssetsCurrent		USD
CY2013Q4	aee	Disposal Group Including Discontinued Operation Derivative Liabilities Current DisposalGroupIncludingDiscontinuedOperationDerivativeLiabilitiesCurrent		USD
CY2013Q4	aee	Insurance Aggregate Maximum Coverage InsuranceAggregateMaximumCoverage	13616000000	USD
CY2013Q4	aee	Insurance Maximum Coverage Per Incident InsuranceMaximumCoveragePerIncident	128000000	USD
CY2013Q4	aee	Disposal Group Including Discontinued Operation Noncontrolling Interest DisposalGroupIncludingDiscontinuedOperationNoncontrollingInterest		USD
CY2012	aee	Disposal Group Including Discontinued Operation Other Income Loss DisposalGroupIncludingDiscontinuedOperationOtherIncomeLoss		USD
CY2011	aee	Disposal Group Including Discontinued Operation Other Income Loss DisposalGroupIncludingDiscontinuedOperationOtherIncomeLoss	1000000	USD
CY2013	aee	Disposal Group Including Discontinued Operation Other Income Loss DisposalGroupIncludingDiscontinuedOperationOtherIncomeLoss	-1000000	USD
CY2013Q4	aee	Disposal Group Including Discontinued Operation Pension And Other Postretirement Benefit Current DisposalGroupIncludingDiscontinuedOperationPensionAndOtherPostretirementBenefitCurrent		USD
CY2012Q4	aee	Disposal Group Including Discontinued Operation Pension And Other Postretirement Benefit Current DisposalGroupIncludingDiscontinuedOperationPensionAndOtherPostretirementBenefitCurrent	40000000	USD
CY2013Q4	aee	Disposal Group Including Discontinued Operation Property Plant And Equipment Net Current DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNetCurrent	142000000	USD
CY2012Q4	aee	Disposal Group Including Discontinued Operation Property Plant And Equipment Net Current DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNetCurrent	748000000	USD
CY2013	aee	Donations Donations	12000000	USD
CY2011	aee	Donations Donations	8000000	USD
CY2012	aee	Donations Donations	24000000	USD
CY2013	aee	Estimated Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities EstimatedUnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	20000000	USD
CY2013	aee	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityTransfersNet	1000000	USD
CY2012	aee	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityTransfersNet	182000000	USD
CY2011	aee	Generator Advances For Construction Refunded Net Of Receipts GeneratorAdvancesForConstructionRefundedNetOfReceipts	-73000000	USD
CY2013	aee	Generator Advances For Construction Refunded Net Of Receipts GeneratorAdvancesForConstructionRefundedNetOfReceipts	-1000000	USD
CY2013	aee	Missouri Public Service Commission Requirement To File Updated Cost Study And Funding Analysis For Decommissioning Energy Center Period MissouriPublicServiceCommissionRequirementToFileUpdatedCostStudyAndFundingAnalysisForDecommissioningEnergyCenterPeriod	P3Y
CY2013	aee	Number Of Additional Weeks After Initial Indemnity Coverage For Power Outage NumberOfAdditionalWeeksAfterInitialIndemnityCoverageForPowerOutage	P71W
CY2013Q4	aee	Number Of Combustion Turbine Electric Generation Equipment Under Capital Lease Agreements NumberOfCombustionTurbineElectricGenerationEquipmentUnderCapitalLeaseAgreements	2	equipment
CY2012Q4	aee	Number Of Combustion Turbine Electric Generation Equipment Under Capital Lease Agreements NumberOfCombustionTurbineElectricGenerationEquipmentUnderCapitalLeaseAgreements	2	equipment
CY2013	aee	Numberofweeksofcoverageafterthefirsteightweeksofanoutage Numberofweeksofcoverageafterthefirsteightweeksofanoutage	P52W
CY2013	aee	Nwf Fee Number Of Mills NwfFeeNumberOfMills	1	mill
CY2013	aee	Other Comprehensive Income Loss Discontinued Operations Tax OtherComprehensiveIncomeLossDiscontinuedOperationsTax	-10000000	USD
CY2012	aee	Other Comprehensive Income Loss Discontinued Operations Tax OtherComprehensiveIncomeLossDiscontinuedOperationsTax	40000000	USD
CY2011	aee	Other Comprehensive Income Loss Discontinued Operations Tax OtherComprehensiveIncomeLossDiscontinuedOperationsTax	-14000000	USD
CY2012	aee	Other Comprehensive Income Loss From Discontinued Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	58000000	USD
CY2011	aee	Other Comprehensive Income Loss From Discontinued Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-20000000	USD
CY2013	aee	Other Comprehensive Income Loss From Discontinued Operations Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossFromDiscontinuedOperationsNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-18000000	USD
CY2013	aee	Tax Credit Carryforward Change In Valuation Allowance TaxCreditCarryforwardChangeInValuationAllowance	2000000	USD
CY2012	aee	Tax Credit Carryforward Change In Valuation Allowance TaxCreditCarryforwardChangeInValuationAllowance	1000000	USD
CY2013	aee	Tax Grants Received Related To Renewable Energy Properties TaxGrantsReceivedRelatedToRenewableEnergyProperties		USD
CY2012	aee	Tax Grants Received Related To Renewable Energy Properties TaxGrantsReceivedRelatedToRenewableEnergyProperties	18000000	USD
CY2011	aee	Tax Grants Received Related To Renewable Energy Properties TaxGrantsReceivedRelatedToRenewableEnergyProperties		USD
CY2013	dei	Amendment Flag AmendmentFlag	false
CY2013	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2011	aee	Payment Of Accrued Interest PaymentOfAccruedInterest	1000000	USD
CY2012	aee	Premium Related To Debt Redemptions PremiumRelatedToDebtRedemptions	-138000000	USD
CY2011	aee	Premium Related To Debt Redemptions PremiumRelatedToDebtRedemptions		USD
CY2013	aee	Premium Related To Debt Redemptions PremiumRelatedToDebtRedemptions		USD
CY2013Q4	aee	Property Plant And Equipment Net Before Construction Work In Progress PropertyPlantAndEquipmentNetBeforeConstructionWorkInProgress	15057000000	USD
CY2012Q4	aee	Property Plant And Equipment Net Before Construction Work In Progress PropertyPlantAndEquipmentNetBeforeConstructionWorkInProgress	14450000000	USD
CY2013Q4	aee	Property Plant And Equipment Number Of Capital Lease Agreements PropertyPlantAndEquipmentNumberOfCapitalLeaseAgreements	2	equipment
CY2012Q4	aee	Property Plant And Equipment Number Of Capital Lease Agreements PropertyPlantAndEquipmentNumberOfCapitalLeaseAgreements	2
CY2012Q4	aee	Receivables Payables And Accrued Income Net ReceivablesPayablesAndAccruedIncomeNet	2000000	USD
CY2013	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2013	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2013	aee	Sub Limit Of Amount Of Coverage In Excess Of Primary Property Liability Coverage For Non Nuclear Events SubLimitOfAmountOfCoverageInExcessOfPrimaryPropertyLiabilityCoverageForNonNuclearEvents	1700000000	USD
CY2013	dei	Document Period End Date DocumentPeriodEndDate	2013-12-31
CY2013	dei	Document Type DocumentType	10-K
CY2013	dei	Entity Central Index Key EntityCentralIndexKey	0001002910
CY2014Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	242634671	shares
CY2013	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2013	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2013Q2	dei	Entity Public Float EntityPublicFloat	8356338069	USD
CY2013	dei	Entity Registrant Name EntityRegistrantName	AMEREN CORP
CY2013	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2013	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2013	dei	Trading Symbol TradingSymbol	AEE

Files In Submission

Name	View Source	Status
0001002910-14-000054-index-headers.html	Edgar Link	pending
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0001002910-14-000054.txt	Edgar Link	pending
0001002910-14-000054-xbrl.zip	Edgar Link	pending
aee-20131231.xml	Edgar Link	completed
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aee-20131231_cal.xml	Edgar Link	unprocessable
aee-20131231_def.xml	Edgar Link	unprocessable
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$AEE
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2013 Form 10-K Financial Statement

#000100291014000054 Filed on March 03, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AEE AMEREN CORP Stock $aee

2013 Form 10-K Financial Statement

#000100291014000054 Filed on March 03, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AEE
AMEREN CORP Stock $aee