-Network: (11 - Statement - Statement Of Income Alternative)

-Income Statement [Abstract] {ID1}

-Statement [Table] {ID2}

-Statement [Line Items] {ID3}

-Operating Revenues: {ID4}

Electric {ID5}

Gas {ID6}

Total operating revenues {ID7}

-Operating Expenses: {ID8}

Fuel {ID9}

Coal contract settlement {ID10}

Purchased power {ID11}

Gas purchased for resale {ID12}

Other operations and maintenance {ID13}

Depreciation and amortization {ID14}

Taxes other than income taxes {ID15}

Total operating expenses {ID16}

Operating Income {ID17}

-Other Income and Expenses: {ID18}

Miscellaneous income {ID19}

Miscellaneous expense {ID20}

Total other income {ID21}

Interest Charges {ID22}

Income Before Income Taxes {ID23}

Income Taxes {ID24}

Net Income {ID25}

Less: Net Income Attributable to Noncontrolling Interests {ID26}

Net Income Attributable to Ameren Corporation {ID27}

Earnings per Common Share - Basic and Diluted {ID28}

Dividends per Common Share {ID29}

Average Common Shares Outstanding {ID30}

-Network: (12 - Statement - Statement Of Financial Position Classified)

-Statement of Financial Position [Abstract] {ID31}

-Statement [Table] {ID32}

-Statement [Line Items] {ID33}

-ASSETS {ID34}

-Current Assets: {ID35}

Cash and cash equivalents {ID36}

Accounts receivable - trade (less allowance for doubtful accounts of $35 and $28, respectively) {ID37}

Unbilled revenue {ID38}

Miscellaneous accounts and notes receivable {ID39}

Materials and supplies {ID40}

Mark-to-market derivative assets {ID41}

Other current assets {ID42}

Total current assets {ID43}

Property and Plant, Net {ID44}

-Investments and Other Assets: {ID45}

Nuclear decommissioning trust fund {ID46}

Goodwill {ID47}

Intangible assets {ID48}

Regulatory assets {ID49}

Other assets {ID50}

Total investments and other assets {ID51}

TOTAL ASSETS {ID52}

-LIABILITIES AND EQUITY {ID53}

-Current Liabilities: {ID54}

Current maturities of long-term debt {ID55}

Short-term debt {ID56}

Accounts and wages payable {ID57}

Taxes accrued {ID58}

Interest accrued {ID59}

Mark-to-market derivative liabilities {ID60}

Other current liabilities {ID61}

Total current liabilities {ID62}

Long-term Debt, Net {ID63}

-Deferred Credits and Other Liabilities: {ID64}

Accumulated deferred income taxes, net {ID65}

Accumulated deferred investment tax credits {ID66}

Regulatory liabilities {ID67}

Asset retirement obligations {ID68}

Pension and other postretirement benefits {ID69}

Other deferred credits and liabilities {ID70}

Total deferred credits and other liabilities {ID71}

Commitments and Contingencies (Notes 2, 8, 9 and 10) {ID72}

-Ameren Corporation Stockholders' Equity: {ID73}

Common stock, $.01 par value, 400.0 shares authorized - shares outstanding of 214.2 and 212.3, respectively {ID74}

Other paid-in capital, principally premium on common stock {ID75}

Retained earnings {ID76}

Accumulated other comprehensive income (loss) {ID77}

Total Ameren Corporation stockholders' equity {ID78}

Noncontrolling Interests {ID79}

Total equity {ID80}

TOTAL LIABILITIES AND EQUITY {ID81}

-Network: (13 - Statement - Statement Of Financial Position Classified (Parenthetical))

-Statement of Financial Position [Abstract] {ID82}

-Statement [Table] {ID83}

-Statement [Line Items] {ID84}

Accounts receivable - trade, allowance for doubtful accounts {ID85}

Common stock, par value {ID86}

Common stock, shares authorized {ID87}

Common stock, shares outstanding {ID88}

-Network: (14 - Statement - Statement Of Cash Flows Indirect)

-Statement of Cash Flows [Abstract] {ID89}

-Statement [Table] {ID90}

-Statement [Line Items] {ID91}

-Cash Flows From Operating Activities: {ID92}

Net income {ID93}

-Adjustments to reconcile net income to net cash provided by operating activities: {ID94}

Gain on sales of emission allowances {ID95}

Net mark-to-market gain on derivatives {ID96}

Coal contract settlement {ID97}

Depreciation and amortization {ID98}

Amortization of nuclear fuel {ID99}

Amortization of debt issuance costs and premium/discounts {ID100}

Deferred income taxes and investment tax credits, net {ID101}

Other {ID102}

-Changes in assets and liabilities: {ID103}

Receivables {ID104}

Materials and supplies {ID105}

Accounts and wages payable {ID106}

Taxes accrued {ID107}

Assets, other {ID108}

Liabilities, other {ID109}

Pension and other postretirement benefits {ID110}

Counterparty collateral, net {ID111}

Taum Sauk costs, net of insurance recoveries {ID112}

Net cash provided by operating activities {ID113}

-Cash Flows From Investing Activities: {ID114}

Capital expenditures {ID115}

Nuclear fuel expenditures {ID116}

Purchases of securities - nuclear decommissioning trust fund {ID117}

Sales of securities - nuclear decommissioning trust fund {ID118}

Purchases of emission allowances {ID119}

Sales of emission allowances {ID120}

Other {ID121}

Net cash used in investing activities {ID122}

-Cash Flows From Financing Activities: {ID123}

Dividends on common stock {ID124}

Debt issuance costs {ID125}

Dividends paid to noncontrolling interest holders {ID126}

Short-term debt, net {ID127}

Redemptions, repurchases, and maturities of long-term debt {ID128}

-Issuances: {ID129}

Common stock {ID130}

Long-term debt {ID131}

Net cash provided by financing activities {ID132}

Net change in cash and cash equivalents {ID133}

Cash and cash equivalents at beginning of year {ID134}

Cash and cash equivalents at end of period {ID135}

-Network: (15 - Disclosure - Notes to Financial Statements)

-Notes to Financial Statements [Abstract] {ID136}

NOTE 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES {ID137}

NOTE 2 - RATE AND REGULATORY MATTERS {ID138}

NOTE 3 - SHORT-TERM BORROWINGS AND LIQUIDITY {ID139}

NOTE 4 - LONG-TERM DEBT AND EQUITY FINANCINGS {ID140}

NOTE 5 - OTHER INCOME AND EXPENSES {ID141}

NOTE 6 - DERIVATIVE FINANCIAL INSTRUMENTS {ID142}

NOTE 7 - FAIR VALUE MEASUREMENTS {ID143}

NOTE 8 - RELATED PARTY TRANSACTIONS {ID144}

NOTE 9 - COMMITMENTS AND CONTINGENCIES {ID145}

NOTE 10 - CALLAWAY NUCLEAR PLANT {ID146}

NOTE 11 - OTHER COMPREHENSIVE INCOME {ID147}

NOTE 12 - RETIREMENT BENEFITS {ID148}

NOTE 13 - SEGMENT INFORMATION {ID149}

NOTE 14 - GOODWILL IMPAIRMENT {ID150}

-Network: (16 - Disclosure - Document Information)

-Document Information [Text Block] {ID151}

Document Type {ID152}

Amendment Flag {ID153}

Amendment Description {ID154}

Document Period End Date {ID155}

-Network: (17 - Disclosure - Entity Information)

-Entity [Text Block] {ID156}

Trading Symbol {ID157}

Entity Registrant Name {ID158}

Entity Central Index Key {ID159}

Current Fiscal Year End Date {ID160}

Entity Well-known Seasoned Issuer {ID161}

Entity Current Reporting Status {ID162}

Entity Voluntary Filers {ID163}

Entity Filer Category {ID164}

Entity Common Stock, Shares Outstanding {ID165}

Entity Public Float {ID166}

AMEREN CORP XBRL Taxonomy Presentation Networks