Annual report pursuant to Section 13 and 15(d)

Derivatives (Details)

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Derivatives (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Interest rate risk on USD denominated long-term borrowings | Interest expense
      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedge Ineffectiveness $ (615) [1] $ (507) [1] $ (443) [1]
Interest rate risk on USD denominated long-term borrowings | Interest expense | Fair Value Hedging [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative (260) [1] 1,696 [1] 1,208 [1]
Hedged Item (355) [1],[2] (2,203) [1],[2] (1,651) [1],[2]
Interest rate risk on foreign currency denominated long-term borrowings | Interest expense
      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedge Ineffectiveness (197) [1] (213) [1] (308) [1]
Interest rate risk on foreign currency denominated long-term borrowings | Interest expense | Fair Value Hedging [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative (523) [1] 120 [1] (413) [1]
Hedged Item 326 [1],[2] (333) [1],[2] 105 [1],[2]
Commodity price risk on commodity inventory | Principal Transactions
      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedge Ineffectiveness    [1]   (1) [1]
Commodity price risk on commodity inventory | Principal Transactions | Fair Value Hedging [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative (6) [1] 16 [1] 19 [1]
Hedged Item 6 [1],[2] (16) [1],[2] (20) [1],[2]
Long-term borrowings | Fair Value Hedging [Member] | Designated as hedging instrument
      
Derivative Instruments, Gain (Loss) [Line Items]      
Trading Assets 5,706 6,940  
Trading Liabilities 664 841  
Long-term borrowings | Fair Value Hedging [Member] | Designated as hedging instrument | Trading assets
      
Derivative Instruments, Gain (Loss) [Line Items]      
Notional amount of hedging derivatives: 36,932 44,180  
Long-term borrowings | Fair Value Hedging [Member] | Designated as hedging instrument | Trading liabilities
      
Derivative Instruments, Gain (Loss) [Line Items]      
Notional amount of hedging derivatives: 9,676 11,092  
Commodity risk | Fair Value Hedging [Member] | Designated as hedging instrument
      
Derivative Instruments, Gain (Loss) [Line Items]      
Trading Assets 48 70  
Trading Liabilities 2 5  
Commodity risk | Fair Value Hedging [Member] | Designated as hedging instrument | Trading assets
      
Derivative Instruments, Gain (Loss) [Line Items]      
Notional amount of hedging derivatives: 124 152  
Commodity risk | Fair Value Hedging [Member] | Designated as hedging instrument | Trading liabilities
      
Derivative Instruments, Gain (Loss) [Line Items]      
Notional amount of hedging derivatives: $ 3 $ 6  
[1] Amounts are recorded in interest expense and other revenues for long-term borrowings and principal transactions for commodity inventory.
[2] Excludes the impact of the accretion of purchase accounting adjustments made to certain long-term borrowings in connection with the acquisition of Merrill Lynch by Bank of America.