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Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Assets:    
Available For Sale Securities $ 14,520 [1] $ 14,546
Trading securities 177 294
Residential mortgage loans held for sale 2,751 1,892
Residential mortgage loans 65 [2] 46 [2]
Derivative assets 2,356 2,074
Total assets 19,869 18,852
Liabilities:    
Derivative liabilities 1,344 1,314
Short positions 6 2
Total liabilities 1,350 1,316
US Treasury and Government
   
Assets:    
Available For Sale Securities 171 230
Trading securities   1
US Government Agencies Debt Securities
   
Assets:    
Available For Sale Securities 1,962 1,645
US States and Political Subdivisions Debt Securities
   
Assets:    
Available For Sale Securities 101 172
Trading securities 9 21
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
   
Assets:    
Available For Sale Securities 10,284 10,973
Trading securities 11 8
Other Debt Securities
   
Assets:    
Available For Sale Securities 1,812 1,342
Trading securities 13 120
Equity Securities, Other
   
Assets:    
Available For Sale Securities 190 [1] 184
Trading securities 144 144
Interest Rate Contract
   
Assets:    
Derivative assets 1,815 1,551
Liabilities:    
Derivative liabilities 858 871
Foreign Exchange Contract
   
Assets:    
Derivative assets 294 343
Liabilities:    
Derivative liabilities 275 323
Equity Contract
   
Assets:    
Derivative assets 113 81
Liabilities:    
Derivative liabilities 81 28
Commodity Contract
   
Assets:    
Derivative assets 134 99
Liabilities:    
Derivative liabilities 130 92
Fair Value, Inputs, Level 1
   
Assets:    
Available For Sale Securities 356 [1] 410
Trading securities 144 48
Derivative assets 8 90
Total assets 508 548
Liabilities:    
Derivative liabilities 54 14
Short positions 2 1
Total liabilities 56 15
Fair Value, Inputs, Level 1 | US Treasury and Government
   
Assets:    
Available For Sale Securities 171 230
Trading securities   1
Fair Value, Inputs, Level 1 | Equity Securities, Other
   
Assets:    
Available For Sale Securities 185 [1] 180
Trading securities 144 47
Fair Value, Inputs, Level 1 | Interest Rate Contract
   
Assets:    
Derivative assets 8 90
Liabilities:    
Derivative liabilities 54 14
Fair Value, Inputs, Level 2
   
Assets:    
Available For Sale Securities 14,164 14,136
Trading securities 32 240
Residential mortgage loans held for sale 2,751 1,892
Derivative assets 2,201 1,890
Total assets 19,148 18,158
Liabilities:    
Derivative liabilities 1,207 1,261
Short positions 4 1
Total liabilities 1,211 1,262
Fair Value, Inputs, Level 2 | US Government Agencies Debt Securities
   
Assets:    
Available For Sale Securities 1,962 1,645
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities
   
Assets:    
Available For Sale Securities 101 172
Trading securities 8 20
Fair Value, Inputs, Level 2 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
   
Assets:    
Available For Sale Securities 10,284 10,973
Trading securities 11 8
Fair Value, Inputs, Level 2 | Other Debt Securities
   
Assets:    
Available For Sale Securities 1,812 1,342
Trading securities 13 115
Fair Value, Inputs, Level 2 | Equity Securities, Other
   
Assets:    
Available For Sale Securities 5 4
Trading securities   97
Fair Value, Inputs, Level 2 | Interest Rate Contract
   
Assets:    
Derivative assets 1,773 1,448
Liabilities:    
Derivative liabilities 802 846
Fair Value, Inputs, Level 2 | Foreign Exchange Contract
   
Assets:    
Derivative assets 294 343
Liabilities:    
Derivative liabilities 275 323
Fair Value, Inputs, Level 2 | Commodity Contract
   
Assets:    
Derivative assets 134 99
Liabilities:    
Derivative liabilities 130 92
Fair Value, Inputs, Level 3
   
Assets:    
Trading securities 1 6
Residential mortgage loans 65 [2] 46 [2]
Derivative assets 147 94
Total assets 213 146
Liabilities:    
Derivative liabilities 83 39
Total liabilities 83 39
Fair Value, Inputs, Level 3 | US States and Political Subdivisions Debt Securities
   
Assets:    
Trading securities   1
Fair Value, Inputs, Level 3 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
   
Assets:    
Trading securities 1  
Fair Value, Inputs, Level 3 | Other Debt Securities
   
Assets:    
Trading securities   5
Fair Value, Inputs, Level 3 | Interest Rate Contract
   
Assets:    
Derivative assets 34 13
Liabilities:    
Derivative liabilities 2 11
Fair Value, Inputs, Level 3 | Equity Contract
   
Assets:    
Derivative assets 113 81
Liabilities:    
Derivative liabilities $ 81 $ 28
[1] Excludes FHLB and FRB restricted stock totaling $497 and $345, respectively, at December 31, 2011, $524 and $344, respectively, at December 31, 2010.
[2] Includes residential mortgage loans originated as held for sale and subsequently transferred to held for investment