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Derivative Instruments and Hedging Activities - Fair Value and Notional Amounts of Derivative Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Notional or contractual amount $ 60,797 $ 57,812
Derivatives at Fair Value - Assets 1,144 1,848
Derivatives at Fair Value - Liabilities 638 400
Derivatives Designated as Accounting Hedges [Member]
   
Derivative [Line Items]    
Notional or contractual amount 34,630 34,139
Derivatives at Fair Value - Assets 507 1,154
Derivatives at Fair Value - Liabilities 321 54
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Contracts [Member]
   
Derivative [Line Items]    
Notional or contractual amount 30,101 28,927
Derivatives at Fair Value - Assets 365 1,136
Derivatives at Fair Value - Liabilities 319 14
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Contracts [Member] | Fair Value Interest Rate Contracts [Member]
   
Derivative [Line Items]    
Notional or contractual amount 15,576 15,902
Derivatives at Fair Value - Assets 360 1,020
Derivatives at Fair Value - Liabilities 137 0
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Contracts [Member] | Cash Flow Interest Rate Contracts [Member]
   
Derivative [Line Items]    
Notional or contractual amount 14,525 13,025
Derivatives at Fair Value - Assets 5 116
Derivatives at Fair Value - Liabilities 182 14
Derivatives Designated as Accounting Hedges [Member] | Foreign Exchange Contracts [Member]
   
Derivative [Line Items]    
Notional or contractual amount 4,529 5,212
Derivatives at Fair Value - Assets 142 18
Derivatives at Fair Value - Liabilities 2 40
Derivatives Designated as Accounting Hedges [Member] | Foreign Exchange Contracts [Member] | Cash Flow Foreign Exchange Contracts [Member]
   
Derivative [Line Items]    
Notional or contractual amount 4,529 5,212
Derivatives at Fair Value - Assets 142 18
Derivatives at Fair Value - Liabilities 2 40
Derivatives not Designated as Accounting Hedges [Member]
   
Derivative [Line Items]    
Notional or contractual amount 26,167 23,673
Derivatives at Fair Value - Assets 637 694
Derivatives at Fair Value - Liabilities 317 346
Derivatives not Designated as Accounting Hedges [Member] | Interest Rate Contracts [Member]
   
Derivative [Line Items]    
Notional or contractual amount 23,757 21,600
Derivatives at Fair Value - Assets 438 536
Derivatives at Fair Value - Liabilities 236 297
Derivatives not Designated as Accounting Hedges [Member] | Interest Rate Contracts [Member] | MSRs [Member]
   
Derivative [Line Items]    
Notional or contractual amount 224 147
Derivatives at Fair Value - Assets 0 12
Derivatives at Fair Value - Liabilities 3 2
Derivatives not Designated as Accounting Hedges [Member] | Interest Rate Contracts [Member] | Customer Accommodation [Member]
   
Derivative [Line Items]    
Notional or contractual amount 21,209 18,900
Derivatives at Fair Value - Assets 403 479
Derivatives at Fair Value - Liabilities 209 273
Derivatives not Designated as Accounting Hedges [Member] | Interest Rate Contracts [Member] | Other Interest Rate Exposures [Member]
   
Derivative [Line Items]    
Notional or contractual amount 2,324 2,553
Derivatives at Fair Value - Assets 35 45
Derivatives at Fair Value - Liabilities 24 22
Derivatives not Designated as Accounting Hedges [Member] | Foreign Exchange Contracts [Member]
   
Derivative [Line Items]    
Notional or contractual amount 1,337 1,372
Derivatives at Fair Value - Assets 186 158
Derivatives at Fair Value - Liabilities 67 46
Derivatives not Designated as Accounting Hedges [Member] | Other Contracts [Member]
   
Derivative [Line Items]    
Notional or contractual amount 1,073 701
Derivatives at Fair Value - Assets 13 0
Derivatives at Fair Value - Liabilities $ 14 $ 3