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Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets:    
Available For Sale Securities $ 14,419 [1] $ 14,363 [1]
Trading securities 218 207
Residential mortgage loans held for sale 2,560 2,856
Residential mortgage loans 81 [2] 76 [2]
Derivative assets 1,848 1,972
Total assets 19,126 19,474
Liabilities:    
Derivative liabilities 866 915
Short positions 6 10
Total liabilities 872 925
US Treasury and Government
   
Assets:    
Available For Sale Securities 41 41
Trading securities   1
US Government Agencies Debt Securities
   
Assets:    
Available For Sale Securities 1,899 1,911
Trading securities 11 6
US States and Political Subdivisions Debt Securities
   
Assets:    
Available For Sale Securities 212 212
Trading securities 25 17
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
   
Assets:    
Available For Sale Securities 8,844 8,730
Trading securities 4 7
Other Debt Securities
   
Assets:    
Available For Sale Securities 3,201 3,277
Trading securities 9 15
Equity Securities, Other
   
Assets:    
Available For Sale Securities 222 [1] 192 [1]
Trading securities 169 161
Interest Rate Contract
   
Assets:    
Derivative assets 1,330 1,507
Liabilities:    
Derivative liabilities 561 617
Foreign Exchange Contract
   
Assets:    
Derivative assets 233 201
Liabilities:    
Derivative liabilities 198 183
Equity Contract
   
Assets:    
Derivative assets 211 177
Liabilities:    
Derivative liabilities 37 33
Commodity Contract
   
Assets:    
Derivative assets 74 87
Liabilities:    
Derivative liabilities 70 82
Fair Value, Inputs, Level 1
   
Assets:    
Available For Sale Securities 134 [1] 120 [1]
Trading securities 169 162
Derivative assets 8 2
Total assets 311 284
Liabilities:    
Derivative liabilities 22 14
Short positions 6 8
Total liabilities 28 22
Fair Value, Inputs, Level 1 | US Treasury and Government
   
Assets:    
Available For Sale Securities 41 41
Trading securities   1
Fair Value, Inputs, Level 1 | Equity Securities, Other
   
Assets:    
Available For Sale Securities 93 [1] 79 [1]
Trading securities 169 161
Fair Value, Inputs, Level 1 | Interest Rate Contract
   
Assets:    
Derivative assets 8 2
Liabilities:    
Derivative liabilities 22 14
Fair Value, Inputs, Level 2
   
Assets:    
Available For Sale Securities 14,285 [1] 14,243 [1]
Trading securities 48 44
Residential mortgage loans held for sale 2,560 2,856
Derivative assets 1,578 1,733
Total assets 18,471 18,876
Liabilities:    
Derivative liabilities 804 865
Short positions   2
Total liabilities 804 867
Fair Value, Inputs, Level 2 | US Government Agencies Debt Securities
   
Assets:    
Available For Sale Securities 1,899 1,911
Trading securities 11 6
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities
   
Assets:    
Available For Sale Securities 212 212
Trading securities 24 16
Fair Value, Inputs, Level 2 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
   
Assets:    
Available For Sale Securities 8,844 8,730
Trading securities 4 7
Fair Value, Inputs, Level 2 | Other Debt Securities
   
Assets:    
Available For Sale Securities 3,201 3,277
Trading securities 9 15
Fair Value, Inputs, Level 2 | Equity Securities, Other
   
Assets:    
Available For Sale Securities 129 [1] 113 [1]
Fair Value, Inputs, Level 2 | Interest Rate Contract
   
Assets:    
Derivative assets 1,271 1,445
Liabilities:    
Derivative liabilities 536 600
Fair Value, Inputs, Level 2 | Foreign Exchange Contract
   
Assets:    
Derivative assets 233 201
Liabilities:    
Derivative liabilities 198 183
Fair Value, Inputs, Level 2 | Commodity Contract
   
Assets:    
Derivative assets 74 87
Liabilities:    
Derivative liabilities 70 82
Fair Value, Inputs, Level 3
   
Assets:    
Trading securities 1 1
Residential mortgage loans 81 [2] 76 [2]
Derivative assets 262 237
Total assets 344 314
Liabilities:    
Derivative liabilities 40 36
Total liabilities 40 36
Fair Value, Inputs, Level 3 | US States and Political Subdivisions Debt Securities
   
Assets:    
Trading securities 1 1
Fair Value, Inputs, Level 3 | Interest Rate Contract
   
Assets:    
Derivative assets 51 60
Liabilities:    
Derivative liabilities 3 3
Fair Value, Inputs, Level 3 | Equity Contract
   
Assets:    
Derivative assets 211 177
Liabilities:    
Derivative liabilities $ 37 $ 33
[1] Excludes FHLB and FRB restricted stock totaling $497 and $347, respectively, at March 31, 2013 and December 31, 2012.
[2] Includes residential mortgage loans originated as held for sale and subsequently transferred to held for investment. During the three months ended March 31, 2013 and the year ended December 31, 2012, no assets or liabilities were transferred between Level 1 and Level 2