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Fair Value of Financial Instruments (Details 3) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes        
No transfers during the three and six months ended June 30, 2013 and 2013 (Level 1 to Level 2) $ 0 $ 0    
No transfers during the three and six months ended June 30, 2013 and 2013 (Level 2 to Level 1) 0 0    
Fair Value, Inputs, Level 3 [Member]
       
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 108,000,000   95,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 17,000,000      
Total gains/(losses) - realized/unrealized:        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 (6,000,000)      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases (21,000,000)      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Contracts Acquired 3,000,000      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 18,000,000      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 2,000,000      
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end 19,000,000      
Fair Value, Inputs, Level 3 [Member] | Debt Securities
       
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 18,000,000 13,000,000 16,000,000 12,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0    
Total gains/(losses) - realized/unrealized:        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Contracts Acquired 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 2,000,000 1,000,000    
Included in nuclear decommissioning obligations   0    
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end 0 0    
Fair Value, Inputs, Level 3 [Member] | Other Financial Instrument [Member]
       
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 11,000,000 50,000,000 10,000,000 47,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1,000,000 0    
Total gains/(losses) - realized/unrealized:        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Contracts Acquired 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Included in nuclear decommissioning obligations   3,000,000    
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end 0 0    
Fair Value, Inputs, Level 3 [Member] | Trust Fund Investments
       
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 56,000,000 5,000,000 56,000,000 (12,000,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 (27,000,000)    
Total gains/(losses) - realized/unrealized:        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0 30,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 (1,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Contracts Acquired 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 15,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Included in nuclear decommissioning obligations   0    
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end 0 (21,000,000)    
Fair Value, Inputs, Level 3 [Member] | Derivative [Member]
       
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 23,000,000 68,000,000 13,000,000 47,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 16,000,000 (27,000,000)    
Total gains/(losses) - realized/unrealized:        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 (6,000,000) 30,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases (21,000,000) (1,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Contracts Acquired 3,000,000      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 18,000,000 15,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 1,000,000    
Included in nuclear decommissioning obligations   3,000,000    
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end $ 19,000,000 $ (21,000,000)