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
Jun. 30, 2013
Dec. 31, 2012
Variable Interest Entity [Line Items]    
Investment securities $ 14,077 $ 13,625
Total Assets 572,908 602,928
Loans and Leases Receivable, Net of Deferred Income 20,264 19,602
Other Assets 16,586 17,464
Long-term Debt 81,551 92,249
Total Liabilities 507,598 538,528
Prime [Member] | Unconsolidated VIEs
    
Variable Interest Entity [Line Items]    
Maximum loss exposure 5 [1] 20 [1]
Prime [Member] | Unconsolidated VIEs | Senior securities held [Member]
    
Variable Interest Entity [Line Items]    
Trading assets 0 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 5 8
Total Assets 5 [2] 20 [2]
Principal balance outstanding 305 [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 67 [1] 55 [1]
Subprime [Member] | Unconsolidated VIEs | Senior securities held [Member]
    
Variable Interest Entity [Line Items]    
Trading assets 12 4
Investment securities 0 0
Subprime [Member] | Unconsolidated VIEs | Subordinate securities held [Member]
    
Variable Interest Entity [Line Items]    
Trading assets 12 3
Residual interests held 0 4
Total Assets 24 [2] 11 [2]
Principal balance outstanding 5,368 [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 78 [1] 102 [1]
Commercial Mortgage [Member] | Unconsolidated VIEs | Senior securities held [Member]
    
Variable Interest Entity [Line Items]    
Trading assets 5 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 36 38
Total Assets 43 [2] 45 [2]
Principal balance outstanding 19,195 [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.