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Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Nonrecurring Basis) (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Commercial Loans Held For Sale    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets $ 15 $ 45
Residential Mortgagel Loans Held For Sale    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 91  
Automobile Loans Held For Sale    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 3  
Commercial and Industrial Loans    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 397 62
Commercial Mortgage Loans    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets $ 85 76
Commercial Leases    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets    
Commercial Construction Loans    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets   2
Residential mortgage loans    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets $ 55  
Servicing Rights    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 854 928
OREO Property    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 46 124
Bank premises and equipment    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 130 $ 15
Operating lease equipment    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets $ 57  
Minimum | Residential Mortgagel Loans Held For Sale    
Fair Value Inputs [Line Items]    
Interest rate risk factor (7.50%)  
Minimum | Residential mortgage loans    
Fair Value Inputs [Line Items]    
Interest rate risk factor (9.70%) (16.60%)
Credit risk factor 0.00% 0.00%
Minimum | Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 1.00% 0.00%
Discount rate   9.60%
OAS spread (bps) 430  
Maximum | Residential Mortgagel Loans Held For Sale    
Fair Value Inputs [Line Items]    
Interest rate risk factor 0.10%  
Maximum | Residential mortgage loans    
Fair Value Inputs [Line Items]    
Interest rate risk factor 20.00% 19.50%
Credit risk factor 85.50% 62.40%
Maximum | Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 100.00% 100.00%
Discount rate   13.20%
OAS spread (bps) 1750  
Weighted average | Commercial Loans Held For Sale    
Fair Value Inputs [Line Items]    
Discount rate 4.40% 10.00%
Weighted average | Residential Mortgagel Loans Held For Sale    
Fair Value Inputs [Line Items]    
Interest rate risk factor (1.60%)  
Credit risk factor 0.10%  
Weighted average | Automobile Loans Held For Sale    
Fair Value Inputs [Line Items]    
Discount rate 3.10%  
Weighted average | Residential mortgage loans    
Fair Value Inputs [Line Items]    
Interest rate risk factor 2.70% 4.60%
Credit risk factor 0.90% 2.10%
Weighted average | Fixed | Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 7.60% 11.10%
Discount rate   9.90%
OAS spread (bps) 930  
Weighted average | Adjustable | Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 32.70% 26.50%
Discount rate   11.80%
OAS spread (bps) 651