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Significant Accounting Policies (Details Textuals) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Line Items]      
Other Nonoperating Income $ 201,000,000 $ 173,000,000 $ 117,000,000
Receivables Due Date 21 days    
Threshold Period Past Due for Write-off of Trade Accounts Receivable 150 days    
Specific Review of Probable Future Collections Based on Receivable Balances in Excess of Pre Specified Days 30 days    
Unbilled Revenues included in Customer Accounts Receivable 1,542,000,000 1,336,000,000  
Accrued Expense Related to Fermi 2 Refueling Outages 26,000,000 12,000,000  
Period Expenses Related To Fermi 2 Refueling Outages Are Accrued 18 months    
Amortization of Intangible Assets 14,000,000 6,000,000 5,000,000
Excise Sales Tax Net Impact on Statement of Operations 0    
Charitable Contributions to a Foundation 18,000,000 21,000,000 21,000,000
Minimum [Member]
     
Significant Accounting Policies [Line Items]      
Notes Receivable Considered Delinquent Period 60 days    
Finite Lived Asset Useful Life 1 year    
Maximum [Member]
     
Significant Accounting Policies [Line Items]      
Notes Receivable Considered Delinquent Period 120 days    
Finite Lived Asset Useful Life 28 years    
Unbilled Revenues [Member]
     
Significant Accounting Policies [Line Items]      
Unbilled Revenues included in Customer Accounts Receivable 815,000,000 686,000,000  
Public Utilities, Inventory, Natural Gas [Member]
     
Significant Accounting Policies [Line Items]      
LIFO Inventory Amount 4,000,000 37,000,000  
Excess of Replacement Costs over Stated LIFO Value 170,000,000 113,000,000  
Power and Industrial Projects [Member]
     
Significant Accounting Policies [Line Items]      
Other Nonoperating Income $ 81,000,000 $ 63,000,000 $ 15,000,000