v2.4.0.6
Mortgage Banking Activities Textuals (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mortgage Banking Activities (Textual) [Abstract]        
Cumulative effect of fair value election for certain residential mortgage servicing rights $ 2,000,000      
Amortization (233,000,000) (264,000,000) (228,000,000)  
Fair Value of amortized MSRs 1,400,000,000 1,756,000,000 1,812,000,000 1,261,000,000
Retained earnings [Member]
       
Mortgage Banking Activities (Textual) [Abstract]        
Cumulative effect of fair value election for certain residential mortgage servicing rights 2,000,000      
Liability For Mortgage Loans Repurchase Losses [Member]
       
Mortgage Banking Activities (Textual) [Abstract]        
Loss Contingency, Range of Possible Loss, Portion Not Accrued 2,400,000,000      
Residential Mortgage Servicing [Member]
       
Mortgage Banking Activities (Textual) [Abstract]        
Amortization   (50,000,000) (5,000,000)  
Residential Mortgage Servicing [Member] | Election of fair value option [Member]
       
Mortgage Banking Activities (Textual) [Abstract]        
Residential MSRs transferred from amortized MSRs 315,000,000      
Amortized [Member]
       
Mortgage Banking Activities (Textual) [Abstract]        
Amortization (233,000,000) (264,000,000) (228,000,000)  
Amortized [Member] | Commercial Mortgage Servicing [Member]
       
Mortgage Banking Activities (Textual) [Abstract]        
Fair Value of amortized MSRs 1,400,000,000 1,440,000,000 1,371,000,000  
Amortized [Member] | Residential Mortgage Servicing [Member]
       
Mortgage Banking Activities (Textual) [Abstract]        
Residential MSRs transferred to MSRs carried at Fair Value, Gross 350,000,000      
Residential MSRs transferred to MSRs carried at Fair Value, Net 313,000,000      
Balance of amortized MSRs   350,000,000 400,000,000  
Fair Value of amortized MSRs   $ 316,000,000 $ 441,000,000