v2.4.0.8
Derivative Instruments (Textuals) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net $ 0 $ 2 $ (2)
Derivative Instruments (Textuals) [Abstract]      
Maximum length of time hedging using interest rate derivative instruments 10 years    
Derivative, Net Liability Position, Aggregate Fair Value 8    
Collateral Already Posted, Aggregate Fair Value 1    
Additional Collateral, Aggregate Fair Value 0    
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net 12   91
Unrealized losses associated with interest rate swap breakage costs 3 11 44
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 43    
Losses from interest rate contracts reclassified from OCI into earnings     15
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments 0 (14) (145)
Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments, Unrealized   14  
Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments, Realized   142  
Interest Rate Swap [Member]
      
Derivatives, Fair Value [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net     (1)
Interest Rate Swap [Member]
      
Derivative Instruments (Textuals) [Abstract]      
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments   156  
Parent [Member]
      
Derivative Instruments (Textuals) [Abstract]      
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax (148) (222) (158)
Noncontrolling Interest [Member]
      
Derivative Instruments (Textuals) [Abstract]      
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax $ (11) $ (20) $ (14)