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Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Nonrecurring Basis) (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Commercial Loans Held For Sale    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets $ 14 $ 25
Residential Mortgagel Loans Held For Sale    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 96  
Automobile Loans Held For Sale    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 2  
Credit Card Held For Sale    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 4  
Commercial and Industrial Loans    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 290 387
Commercial Mortgage Loans | Commercial    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 112 49
Commercial construction loans | Commercial    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 9 4
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 756 933
OREO Property    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 64 77
Bank premises and equipment    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets 79 $ 4
Operating lease equipment    
Fair Value Inputs [Line Items]    
Fair value measurements nonrecurring assets $ 53  
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 (8.00%) (11.00%)
Minimum | Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 1.00%  
Discount rate   9.60%
OAS spread (bps) 304  
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 16.30% 18.50%
Credit risk factor 80.50% 58.60%
Maximum | Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 100.00% 100.00%
Discount rate   13.20%
OAS spread (bps) 1525  
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 4.00% 4.50%
Credit risk factor 0.90% 1.70%
Weighted average | Fixed | Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 11.70% 10.80%
Discount rate   9.90%
OAS spread (bps) 706  
Weighted average | Adjustable | Servicing Rights    
Fair Value Inputs [Line Items]    
Prepayment speed 32.70% 26.00%
Discount rate   11.80%
OAS spread (bps) 668