Quarterly report pursuant to Section 13 or 15(d)

Fair Value Disclosures - Fair Value Option (Details)

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Fair Value Disclosures - Fair Value Option (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due $ 6   $ 6   $ 115
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 19   19   25
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status, Aggregated Difference 36   36   153
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]          
Receivables under securities borrowed transactions 1,954   1,954   961
Loans 1,301   1,301   3,077
Long-term borrowings 27,964   27,964   30,875
Receivables under resale agreements
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) (8) 5 30 (29)  
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]          
Receivables under resale agreements 99,001   99,001   93,715
Principal Amount Due Upon Maturity Assets 98,704   98,704   93,433
Difference, Assets 297   297   282
Investment securities
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) (3) (3) (3) 2  
Loans
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 25 (12) (16) 106  
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]          
Loans 2,472 [1]   2,472 [1]   4,063 [2]
Principal Amount Due Upon Maturity Assets 3,163 [1]   3,163 [1]   4,835 [2]
Difference, Assets (691) [1]   (691) [1]   (772) [2]
Loans | Trading Loans [Member]
          
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]          
Loans 904   904    
Loans | Margin Loans [Member]
          
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]          
Loans 267   267   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) (6)   (3)    
Payables under repurchase agreements
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 4 9 (16) (25)  
Short-term borrowings
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 11 12 (28) 19  
Other payables - interest and other
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 4 (18) 17 31  
Long-term borrowings
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 903 571 (29) (1,862)  
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]          
Long-term borrowings 27,964 [3],[4]   27,964 [3],[4]   30,875 [5],[6]
Principal Amount Due Upon Maturity Liabilities 28,629 [3],[4]   28,629 [3],[4]   32,151 [5],[6]
Difference, Liabilities (665) [3],[4]   (665) [3],[4]   (1,276) [5],[6]
Structured notes
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 46 36 12 2,200  
Receivables under securities borrowed transactions
          
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]          
Receivables under securities borrowed transactions 1,954   1,954   961
Principal Amount Due Upon Maturity Assets 1,980   1,980   892
Difference, Assets (26)   (26)   69
Structured liabilities
          
Difference Between Fair Values and Aggregate Contractual Principal Amounts [Abstract]          
Long-term borrowings 18,600 [4]   18,600 [4]   22,000 [6]
Principal Amount Due Upon Maturity Liabilities 19,000 [4]   19,000 [4]   22,700 [6]
Principal Transactions | Receivables under resale agreements
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) (8) 5 30 (29)  
Principal Transactions | Investment securities
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0 0 0 0  
Principal Transactions | Loans
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 11 3 26 29  
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   0    
Principal Transactions | Payables under repurchase agreements
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 4 9 (16) (25)  
Principal Transactions | Short-term borrowings
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 11 12 (28) 19  
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 0 0  
Principal Transactions | Long-term borrowings
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 903 592 (29) (1,841)  
Other Revenues | Receivables under resale agreements
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0 0 0 0  
Other Revenues | Investment securities
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) (3) (3) (3) 2  
Other Revenues | Loans
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 14 (15) (42) 77  
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) (6)   (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 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 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) 4 (18) 17 31  
Other Revenues | Long-term borrowings
          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ 0 $ (21) $ 0 $ (21)  
[1] Includes trading loans with a fair value of $904 million and margin loans with a fair value of $267 million.
[2] Includes trading loans with a fair value of $715 million and margin loans with a fair value of $271 million.
[3] Includes structured liabilities with a fair value of $18.6 billion and principal amount due upon maturity of $19.0 billion as of June 30, 2013.
[4] The majority of the difference between the fair value and principal amount due upon maturity at June 30, 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.
[5] Includes structured liabilities with a fair value of $22.0 billion and principal amount due upon maturity of $22.7 billion as of December 31, 2012.
[6] 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.