Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Derivatives - Credit-related Contingent Features and Collateral (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Collateral Held, Cash and Securities $ 79,300,000,000 $ 85,600,000,000
Collateral Already Posted, Aggregate Fair Value 63,400,000,000 74,100,000,000
Collateral Not Yet Posted Aggregate Fair Value 2,100,000,000  
Unilateral Derivative Termination Contract [Member]
   
Derivative [Line Items]    
Collateral Already Posted, Aggregate Fair Value 345,000,000  
Derivative Liability, Fair Value, Amount Offset Against Collateral 393,000,000  
Unilateral Derivative Termination Contract For Rating Downgrade of Long-Term Senior Debt [Member]
   
Derivative [Line Items]    
Collateral Already Posted, Aggregate Fair Value 2,100,000,000  
Derivative Liability, Fair Value, Amount Offset Against Collateral 2,700,000,000  
Rating Agency Downgrade By One Notch [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value 3,000,000,000  
Rating Agency Downgrade by Two Notches [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value 5,400,000,000  
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 1,200,000,000  
Derivative Liability, Incremental Increase, Fair Value, Amount Offset Against Collateral 1,800,000,000  
Bank of America, N.A. [Member]
   
Derivative [Line Items]    
Collateral Not Yet Posted Aggregate Fair Value 1,300,000,000  
Bank of America, N.A. [Member] | Rating Agency Downgrade By One Notch [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value 2,600,000,000  
Bank of America, N.A. [Member] | Rating Agency Downgrade by Two Notches [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value 1,300,000,000  
Merrill Lynch [Member]
   
Derivative [Line Items]    
Collateral Not Yet Posted Aggregate Fair Value 800,000,000  
Merrill Lynch [Member] | Rating Agency Downgrade By One Notch [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value 400,000,000  
Merrill Lynch [Member] | Rating Agency Downgrade by Two Notches [Member]
   
Derivative [Line Items]    
Additional Collateral, Aggregate Fair Value $ 4,100,000,000