Quarterly report pursuant to Section 13 or 15(d)

Fair Value Disclosures - Fair Value Option (Details)

v2.4.0.6
Fair Value Disclosures - Fair Value Option (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due $ 19   $ 115
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 26   25
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status, Aggregated Difference 49   153
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]      
Receivables under securities borrowed transactions 1,282   961
Loans 2,093   3,077
Long-term borrowings 33,568   30,875
Receivables under resale agreements
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 38 (34)  
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]      
Receivables under resale agreements 89,969   93,715
Principal Amount Due Upon Maturity Assets 89,608   93,433
Difference, Assets 361   282
Investment securities
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0 5  
Loans
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (41) 118  
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]      
Loans 3,108 [1]   4,063 [2]
Principal Amount Due Upon Maturity Assets 3,802 [1]   4,835 [2]
Difference, Assets (694) [1]   (772) [2]
Loans | Trading Loans [Member]
      
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]      
Loans 742    
Loans | Margin Loans [Member]
      
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]      
Loans 273   271
Loans | Loans Held for Sale [Member]
      
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]      
Loans     715
Fair Value Option, Other Eligible Items [Member]
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 3    
Payables under repurchase agreements
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (20) (34)  
Short-term borrowings
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (39) 7  
Other payables - interest and other
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 13 49  
Long-term borrowings
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (932) (2,433)  
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]      
Long-term borrowings 33,568 [3]   30,875 [4]
Principal Amount Due Upon Maturity Liabilities 34,023 [3]   32,151 [4]
Difference, Liabilities (455) [3]   (1,276) [4]
Structured notes
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0 2,100  
Receivables under securities borrowed transactions
      
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]      
Receivables under securities borrowed transactions 1,282   961
Principal Amount Due Upon Maturity Assets 1,272   892
Difference, Assets 10   69
Principal Transactions | Receivables under resale agreements
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 38 (34)  
Principal Transactions | Investment securities
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0 0  
Principal Transactions | Loans
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 15 26  
Principal Transactions | Fair Value Option, Other Eligible Items [Member]
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0    
Principal Transactions | Payables under repurchase agreements
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (20) (34)  
Principal Transactions | Short-term borrowings
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (39) 7  
Principal Transactions | Other payables - interest and other
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0 0  
Principal Transactions | Long-term borrowings
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (932) (2,433)  
Other Revenues | Receivables under resale agreements
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0 0  
Other Revenues | Investment securities
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0 5  
Other Revenues | Loans
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (56) 92  
Other Revenues | Fair Value Option, Other Eligible Items [Member]
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 3    
Other Revenues | Payables under repurchase agreements
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0 0  
Other Revenues | Short-term borrowings
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0 0  
Other Revenues | Other payables - interest and other
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 13 49  
Other Revenues | Long-term borrowings
      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ 0 $ 0  
[1] Includes trading loans with a fair value of $742 million and margin loans with a fair value of $273 million.
[2] Includes trading loans with a fair value of $715 million and margin loans with a fair value of $271 million.
[3] The majority of the difference between the fair value and principal amount due upon maturity at March 31, 2013 relates to the impact of changes in Merrill Lynch's credit spreads, as well as the fair value of the embedded derivative, where applicable.
[4] The difference between the fair value and principal amount due upon maturity at December 31, 2012 relates to the impact of changes in Merrill Lynch's credit spreads, as well as the fair value of the embedded derivative, where applicable.