v2.4.0.6
Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Derivative Instruments And Hedging Activities [Line Items]    
Total derivatives $ 119,464 $ 172,869
Notional value of cash flow hedging relationships 11,500  
Fair Value of derivative assets 2,149 2,853
Fair Value of derivative liabilities 2,025 2,514
Designated As Hedging Instrument [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Notional value of derivatives designated as hedging instruments 5,107 17,675
Fair Value of derivative assets 128 362
Fair Value of derivative liabilities   13
Not Designated As Hedging Instrument [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Notional value of derivatives not designated as hedging instruments 114,357 155,194
Fair Value of derivative assets 2,021 2,491
Fair Value of derivative liabilities 2,025 2,501
Interest Rate Swaps [Member] | Designated As Hedging Instrument [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Notional value of fair value hedging relationships 5,107 5,535
Notional value of cash flow hedging relationships   11,500
Asset Derivatives in fair value hedging relationships 128 153
Asset Derivatives in cash flow hedging relationships   209
Liability Derivatives in fair value hedging relationships   1
Fair Value of derivative liabilities   1
Interest Rate Swaps [Member] | Not Designated As Hedging Instrument [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Notional value of derivatives not designated as hedging instruments 53,020 59,293 [1]
Fair Value of derivative assets 1,931 2,396 [1]
Fair Value of derivative liabilities 1,953 2,414 [1]
Interest Rate Swaps [Member] | Morgan Keegan [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Notional value of derivatives not designated as hedging instruments   4,200
Interest Rate Swaps [Member] | Morgan Keegan [Member] | Other Assets/Other Liabilities [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Amount in Other Assets/Other Liabilities   454
Interest Rate Options [Member] | Not Designated As Hedging Instrument [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Notional value of derivatives not designated as hedging instruments 3,838 4,018 [2]
Fair Value of derivative assets 34 41 [2]
Fair Value of derivative liabilities 4 28 [2]
Interest Rate Options [Member] | Morgan Keegan [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Notional value of derivatives not designated as hedging instruments   364
Interest Rate Options [Member] | Morgan Keegan [Member] | Other Assets/Other Liabilities [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Amount in Other Assets/Other Liabilities   23
Interest Rate Futures And Forward Commitments [Member] | Not Designated As Hedging Instrument [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Notional value of derivatives not designated as hedging instruments 55,697 90,607
Fair Value of derivative assets 8 11
Fair Value of derivative liabilities 22 23
Other Contracts [Member] | Not Designated As Hedging Instrument [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Notional value of derivatives not designated as hedging instruments 1,802 1,276
Fair Value of derivative assets 48 43
Fair Value of derivative liabilities 46 36
Forward Commitments [Member] | Designated As Hedging Instrument [Member]
   
Derivative Instruments And Hedging Activities [Line Items]    
Notional value of fair value hedging relationships   640
Liability Derivatives in fair value hedging relationships   $ 11
[1] Includes Morgan Keegan amounts of $4.2 billion in Notional Value and $454 million in Other Assets/Other Liabilities
[2] Includes Morgan Keegan amounts of $364 million in Notional Value and $23 million in Other Assets/Other Liabilities