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Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets:    
Residential mortgage loans held for sale $ 2,856 $ 2,751
Derivative assets 1,972 2,356
Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 14,363 [1] 14,520
Trading securities 207 177
Residential mortgage loans held for sale 2,856 2,751
Residential mortgage loans 76 [2] 65 [2]
Derivative assets 1,972 2,356
Total assets 19,474 19,869
Liabilities:    
Derivative liabilities 915 1,344
Short positions 10 6
Total liabilities 925 1,350
US Treasury and Government | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 41 171
Trading securities 1  
US Government Agencies Debt Securities | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 1,911 1,962
Trading securities 6  
US States and Political Subdivisions Debt Securities | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 212 101
Trading securities 17 9
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 8,730 10,284
Trading securities 7 11
Other Debt Securities | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 3,277 1,812
Trading securities 15 13
Equity Securities, Other | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 192 [1] 190
Trading securities 161 144
Interest Rate Contract | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Derivative assets 1,507 1,815
Liabilities:    
Derivative liabilities 617 858
Foreign Exchange Contract | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Derivative assets 201 294
Liabilities:    
Derivative liabilities 183 275
Equity Contract | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Derivative assets 177 113
Liabilities:    
Derivative liabilities 33 81
Commodity Contract | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Derivative assets 87 134
Liabilities:    
Derivative liabilities 82 130
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 120 [1] 356
Trading securities 162 144
Derivative assets 2 8
Total assets 284 508
Liabilities:    
Derivative liabilities 14 54
Short positions 8 2
Total liabilities 22 56
Fair Value, Inputs, Level 1 | US Treasury and Government | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 41 171
Fair Value, Inputs, Level 1 | Equity Securities, Other | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 79 [1] 185
Trading securities 161 144
Fair Value, Inputs, Level 1 | Interest Rate Contract | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Derivative assets 2 8
Liabilities:    
Derivative liabilities 14 54
Fair Value, Inputs, Level 1 | Trading Securities | US Treasury and Government | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Trading securities 1  
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 14,243 14,164
Trading securities 44 32
Residential mortgage loans held for sale 2,856 2,751
Derivative assets 1,733 2,201
Total assets 18,876 19,148
Liabilities:    
Derivative liabilities 865 1,207
Short positions 2 4
Total liabilities 867 1,211
Fair Value, Inputs, Level 2 | US Government Agencies Debt Securities | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 1,911 1,962
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 212 101
Trading securities 16 8
Fair Value, Inputs, Level 2 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 8,730 10,284
Trading securities 7 11
Fair Value, Inputs, Level 2 | Other Debt Securities | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 3,277 1,812
Trading securities 15 13
Fair Value, Inputs, Level 2 | Equity Securities, Other | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Available For Sale Securities 113 5
Fair Value, Inputs, Level 2 | Interest Rate Contract
   
Assets:    
Derivative assets   1,773
Fair Value, Inputs, Level 2 | Interest Rate Contract | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Derivative assets 1,445  
Liabilities:    
Derivative liabilities 600 802
Fair Value, Inputs, Level 2 | Foreign Exchange Contract | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Derivative assets 201 294
Liabilities:    
Derivative liabilities 183 275
Fair Value, Inputs, Level 2 | Commodity Contract | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Derivative assets 87 134
Liabilities:    
Derivative liabilities 82 130
Fair Value, Inputs, Level 2 | Trading Securities | US Government Agencies Debt Securities | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Trading securities 6  
Fair Value, Inputs, Level 3
   
Assets:    
Residential mortgage loans held for sale 83  
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Trading securities 1 1
Residential mortgage loans 76 [2] 65 [2]
Derivative assets 237 147
Total assets 314 213
Liabilities:    
Derivative liabilities 36 83
Total liabilities 36 83
Fair Value, Inputs, Level 3 | US States and Political Subdivisions Debt Securities | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Trading securities   1
Fair Value, Inputs, Level 3 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Trading securities 1  
Fair Value, Inputs, Level 3 | Interest Rate Contract | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Derivative assets 60 34
Liabilities:    
Derivative liabilities 3 2
Fair Value, Inputs, Level 3 | Equity Contract | Fair Value, Measurements, Recurring [Member]
   
Assets:    
Derivative assets 177 113
Liabilities:    
Derivative liabilities $ 33 $ 81
[1] Excludes FHLB and FRB restricted stock totaling $497 and $347, respectively, at December 31, 2012 and $497 and $345, respectively, at December 31, 2011.
[2] Includes residential mortgage loans originated as held for sale and subsequently transferred to held for investment