Annual report pursuant to Section 13 and 15(d)

Derivatives - Credit-related Contingent Features and Collateral (Details)

v2.4.0.6
Derivatives - Credit-related Contingent Features and Collateral (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Derivative [Line Items]    
Collateral Held, Cash and Securities $ 87,700,000,000 $ 86,100,000,000
Collateral Already Posted, Aggregate Fair Value 86,500,000,000 66,900,000,000
Colateral Not Yet Posted Aggregate Fair Value 5,000,000,000  
Unilateral Derivative Termination Contract [Member]
   
Derivative [Line Items]    
Collateral Already Posted, Aggregate Fair Value 1,000,000,000  
Derivative Liability, Fair Value, Amount Offset Against Collateral 947,000,000  
Unilateral Derivative Termination Contract For Rating Downgrade of Long-Term Senior Debt [Member]
   
Derivative [Line Items]    
Collateral Already Posted, Aggregate Fair Value 2,700,000,000  
Derivative Liability, Fair Value, Amount Offset Against Collateral 2,900,000,000  
Rating Agency Downgrade By One Notch [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value 1,600,000,000  
Rating Agency Downgrade By One Notch [Member] | Bank of America, N.A. [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value 1,200,000,000  
Rating Agency Downgrade By One Notch [Member] | Merrill Lynch [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value 375,000,000  
Rating Agency Downgrade by Two Notches [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value 1,100,000,000  
Rating Agency Downgrade by Two Notches [Member] | Unilateral Derivative Termination Contract For Rating Downgrade of Long-Term Senior Debt [Member]
   
Derivative [Line Items]    
Collateral Already Posted, Aggregate Fair Value 5,400,000,000  
Derivative Liability, Incremental Increase, Fair Value, Amount Offset Against Collateral 5,600,000,000  
Rating Agency Downgrade by Two Notches [Member] | Bank of America, N.A. [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value 871,000,000  
Rating Agency Downgrade by Two Notches [Member] | Merrill Lynch [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value $ 269,000,000