Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities (Details)

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Securitizations and Other Variable Interest Entities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Variable Interest Entity [Line Items]    
Investment securities $ 13,087 $ 13,625
Total Assets 577,586 602,928
Loans and Leases Receivable, Net of Deferred Income 20,162 19,602
Other Assets 17,235 17,464
Long-term Debt 90,106 92,249
Total Liabilities 513,265 538,528
Prime [Member] | Unconsolidated VIEs
    
Variable Interest Entity [Line Items]    
Maximum loss exposure 18 [1] 20 [1]
Prime [Member] | Unconsolidated VIEs | Senior securities held [Member]
    
Variable Interest Entity [Line Items]    
Trading assets 12 11
Investment securities 0 1
Prime [Member] | Unconsolidated VIEs | Subordinate securities held [Member]
    
Variable Interest Entity [Line Items]    
Trading assets 0 0
Residual interests held 6 8
Total Assets 18 [2] 20 [2]
Principal balance outstanding 651 [3] 457 [3]
Prime [Member] | Variable Interest Entity, Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Maximum loss exposure 0 [1] 0 [1]
Total Assets 0 0
Loans and Leases Receivable, Net of Deferred Income 0 0
Other Assets 0 0
Long-term Debt 0 0
Total Liabilities 0 0
Subprime [Member] | Unconsolidated VIEs
    
Variable Interest Entity [Line Items]    
Maximum loss exposure 84 [1] 55 [1]
Subprime [Member] | Unconsolidated VIEs | Senior securities held [Member]
    
Variable Interest Entity [Line Items]    
Trading assets 32 4
Investment securities 0 0
Subprime [Member] | Unconsolidated VIEs | Subordinate securities held [Member]
    
Variable Interest Entity [Line Items]    
Trading assets 9 3
Residual interests held 0 4
Total Assets 41 [2] 11 [2]
Principal balance outstanding 5,815 [3] 6,455 [3]
Subprime [Member] | Variable Interest Entity, Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Maximum loss exposure 0 [1] 9 [1]
Total Assets 0 197
Loans and Leases Receivable, Net of Deferred Income 0 185
Other Assets 0 12
Long-term Debt 0 188
Total Liabilities 0 188
Commercial Mortgage [Member] | Unconsolidated VIEs
    
Variable Interest Entity [Line Items]    
Maximum loss exposure 91 [1] 102 [1]
Commercial Mortgage [Member] | Unconsolidated VIEs | Senior securities held [Member]
    
Variable Interest Entity [Line Items]    
Trading assets 4 5
Investment securities 0 0
Commercial Mortgage [Member] | Unconsolidated VIEs | Subordinate securities held [Member]
    
Variable Interest Entity [Line Items]    
Trading assets 2 2
Residual interests held 37 38
Total Assets 43 [2] 45 [2]
Principal balance outstanding 16,888 [3] 17,258 [3]
Commercial Mortgage [Member] | Variable Interest Entity, Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Maximum loss exposure 0 [1] 0 [1]
Total Assets 0 0
Loans and Leases Receivable, Net of Deferred Income 0 0
Other Assets 0 0
Long-term Debt 0 0
Total Liabilities $ 0 $ 0
[1] Maximum loss exposure excludes liabilities for representations and warranties.
[2] Substantially all of the securities were in Level 2 in the fair value hierarchy.
[3] Principal balance outstanding includes those loans that Merrill Lynch transferred and with which it has continuing involvement.