Company:  COMMONWEALTH EDISON CO (EXC)
Form Type:  10-Q
Filing Date:  7/24/2009 
CIK:  0000022606 
Address:  ONE FIRST NATIONAL PLZ 37TH FL
P O BOX 767 
City, State, Zip:  CHICAGO, Illinois 60690 
Telephone:  (312) 394-4321 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$46.81   		Change: 
0.42 (0.91%)  
Trade Time: 
Nov 20   		Market Cap: 
$30.87B
Description of Business
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  FORM 10-Q
    PART I. FINANCIAL INFORMATION
      Item 1. Financial Statements
        INCOME STATEMENT
        CASH FLOW
        BALANCE SHEET
        BALANCE SHEET
        STOCKHOLDERS EQUITY
        INCOME STATEMENT
        CASH FLOW
        BALANCE SHEET
        BALANCE SHEET
        STOCKHOLDERS EQUITY
        INCOME STATEMENT
        CASH FLOW
        BALANCE SHEET
        BALANCE SHEET
        STOCKHOLDERS EQUITY
        INCOME STATEMENT
        CASH FLOW
        BALANCE SHEET
        BALANCE SHEET
        STOCKHOLDERS EQUITY
        COMBINED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
          CASH FLOW
          INCOME STATEMENT
          INCOME STATEMENT
      Item 2. Management's Discussion and Analysis of Financial ...
      Item 3. Quantitative and Qualitative Disclosures About ...
      FINANCIAL STATEMENTS
        INCOME STATEMENT
      Item 4. Controls and Procedures
    PART II - OTHER INFORMATION
      Item 1. Legal Proceedings
      Item 1A. Risk Factors
      Item 4. Submission of Matters to a Vote of Security Holders
      Item 6. Exhibits
    SIGNATURES
  EXHIBIT 31.1
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.2
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.3
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.4
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.5
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.6
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.7
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.8
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 32.1
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.2
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.3
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.4
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.5
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.6
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.7
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.8
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
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