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Supplemental Cash Flow Information
 6 Months Ended
Jun. 30, 2011
Supplemental Cash Flow Information [Abstract]  
SUPPLEMENTAL CASH FLOW INFORMATION
NOTE 13 — SUPPLEMENTAL CASH FLOW INFORMATION
The following table details the changes in assets and liabilities that are reported in the Consolidated Statements of Cash Flows, and supplementary non-cash information:
                 
    Six Months Ended  
    June 30  
(in Millions)   2011     2010  
Changes in Assets and Liabilities, Exclusive of Changes Shown Separately
               
Accounts receivable, net
  $ 65     $ 260  
Inventories
    (23 )     (34 )
Accrued/prepaid pensions
    (187 )     (99 )
Accounts payable
    27       7  
Income taxes receivable/payable
    242       40  
Derivative assets and liabilities
    (20 )     (62 )
Gas inventory equalization
    109       68  
Postretirement obligation
    (55 )     17  
Other assets
    202       98  
Other liabilities
    (94 )     (38 )
 
           
 
  $ 266     $ 257  
 
           
 
               
Noncash financing activities:
               
Common stock issued for employee benefit plans
  $ 1     $ 136