Name:	aee_AdjustmentsrelatedtoIncomeTaxBenefitfromShareBasedPayment
Namespace Prefix:	aee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Adjustments related to Income Tax Benefit from Share-Based payment per diluted share

No definition available.

Name:	aee_AdjustmentsrelatedtoIncomeTaxBenefitfromShareBasedpaymentperdilutedshare
Namespace Prefix:	aee_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Basis Of Presentation And Significant Accounting Policies [Line Items]

No definition available.

Name:	aee_BasisOfPresentationAndSignificantAccountingPoliciesLineItems
Namespace Prefix:	aee_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Cash impact for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

No definition available.

Name:	aee_ExcessTaxBenefitfromShareBasedCompensation
Namespace Prefix:	aee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585