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Commitments, Guarantees and Contingencies (Tables)
6 Months Ended
Jun. 30, 2011
Commitments, Guarantees and Contingencies (Tables) [Abstract]  
Bank of America Settlement Impact on Financial Statement
  (in millions)
 Income Statement:   
  Other Operation Expense - Pretax Gain on Settlement$  51
  Income Tax Expense   73
 Net Loss After Tax$  (22)
     
 Cash Flow Statement:   
  Net Income - Loss on Settlement with BOA and Enron$  (22)
  Deferred Income Taxes    91
  Gain on Settlement with BOA and Enron   (51)
  Settlement of Litigation with BOA and Enron   (211)
  Accrued Taxes, Net   (18)
  Acquisition of Cushion Gas from BOA   (214)
 Cash Paid$  (425)
     
 Balance Sheet:   
  Deferred Charges and Other Noncurrent Assets - Gas Acquired$  214
  Deferred Credits and Other Noncurrent Liabilities - Gas Service Liability   187
  Accrued Taxes - Tax Benefit on Settlement with BOA and Enron    18
  Deferred Income Taxes - Deferred Tax Benefit on Gas Service Liability   66