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Fair Value Measurements (Details 5) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Fair Value Measurements        
Mortgage servicing rights $ 1,224 $ 1,279 $ 1,101 $ 1,022
Derivative assets 44 48    
Derivative liabilities 21 20    
Recurring basis | Level Two
       
Fair Value Measurements        
Mortgage loans held for sale 556 785    
Recurring basis | Level Two | Forward delivery commitments
       
Fair Value Measurements        
Derivative assets 6 26    
Derivative liabilities 4 10    
Recurring basis | Level Two | Option contracts
       
Fair Value Measurements        
Derivative assets   2    
Recurring basis | Level Two | MSR-related agreements
       
Fair Value Measurements        
Derivative assets 8 4    
Recurring basis | Level Two | Interest rate contracts
       
Fair Value Measurements        
Derivative assets 2 2    
Recurring basis | Level Three
       
Fair Value Measurements        
Mortgage loans held for sale 49 49    
Mortgage servicing rights 1,224 1,279    
Recurring basis | Level Three | Interest rate lock commitments
       
Fair Value Measurements        
Derivative assets 21 23    
Derivative liabilities 1 1    
Recurring basis | Level Three | Convertible note-related agreements
       
Fair Value Measurements        
Derivative assets 16 16    
Derivative liabilities 16 16    
Recurring basis | Cash Collateral and Netting | Forward delivery commitments
       
Fair Value Measurements        
Derivative assets (1) (21)    
Derivative liabilities (3) (8)    
Recurring basis | Cash Collateral and Netting | MSR-related agreements
       
Fair Value Measurements        
Derivative assets (8) (4)    
Derivative liabilities 3 1    
Recurring basis | Total
       
Fair Value Measurements        
Mortgage loans held for sale 605 834    
Mortgage servicing rights 1,224 1,279    
Recurring basis | Total | Interest rate lock commitments
       
Fair Value Measurements        
Derivative assets 21 23    
Derivative liabilities 1 1    
Recurring basis | Total | Forward delivery commitments
       
Fair Value Measurements        
Derivative assets 5 5    
Derivative liabilities 1 2    
Recurring basis | Total | Option contracts
       
Fair Value Measurements        
Derivative assets   2    
Recurring basis | Total | MSR-related agreements
       
Fair Value Measurements        
Derivative liabilities 3 1    
Recurring basis | Total | Interest rate contracts
       
Fair Value Measurements        
Derivative assets 2 2    
Recurring basis | Total | Convertible note-related agreements
       
Fair Value Measurements        
Derivative assets 16 16    
Derivative liabilities $ 16 $ 16