v2.4.0.6
Variable Interest Entities and Securitization Activities (Non-Consolidated VIEs) (Details) (Non-Consolidated VIEs, USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Mortgage and Asset-Backed Securities
    
Carrying value of exposure to loss - Assets $ 251,689 [1] $ 231,110 [2]
Maximum exposure to loss 22,500 16,780
Carrying value of exposure to loss - Liabilities 11 13
Mortgage and Asset-Backed Securities | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 22,436 16,570
Mortgage and Asset-Backed Securities | Debt and Equity Interests
    
Maximum exposure to loss 22,280 [3] 16,469 [4]
Mortgage and Asset-Backed Securities | Debt and Equity Interests | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 22,280 [3] 16,469 [4]
Mortgage and Asset-Backed Securities | Derivative and Other Contracts
    
Maximum exposure to loss 154 103
Carrying value of exposure to loss - Liabilities 11 13
Mortgage and Asset-Backed Securities | Derivative and Other Contracts | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 156 101
Mortgage and Asset-Backed Securities | Commitments, Guarantees and Other
    
Maximum exposure to loss 66 208
Carrying value of exposure to loss - Liabilities 0 0
Mortgage and Asset-Backed Securities | Residential Mortgage
    
Carrying value of exposure to loss - Assets 1,000 600
Mortgage and Asset-Backed Securities | Commercial Mortgage
    
Carrying value of exposure to loss - Assets 1,500 1,100
Mortgage and Asset-Backed Securities | Other Consumer and Commercial Loans
    
Carrying value of exposure to loss - Assets 5,000 1,300
Mortgage and Asset-Backed Securities | U.S. Agency Collateralized Mortgage Obligations
    
Carrying value of exposure to loss - Assets 14,800 13,500
Mortgage and Asset-Backed Securities | Variable Interest Entity Assets | Residential Mortgage
    
Carrying value of exposure to loss - Assets 18,300 9,100
Mortgage and Asset-Backed Securities | Variable Interest Entity Assets | Commercial Mortgage
    
Carrying value of exposure to loss - Assets 53,800 81,700
Mortgage and Asset-Backed Securities | Variable Interest Entity Assets | Other Consumer and Commercial Loans
    
Carrying value of exposure to loss - Assets 53,300 18,700
Mortgage and Asset-Backed Securities | Variable Interest Entity Assets | U.S. Agency Collateralized Mortgage Obligations
    
Carrying value of exposure to loss - Assets 126,300 121,600
Collateralized Debt Obligations
    
Carrying value of exposure to loss - Assets 13,178 [1] 7,593 [2]
Maximum exposure to loss 1,224 1,334
Carrying value of exposure to loss - Liabilities 2 159
Collateralized Debt Obligations | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 1,181 1,148
Collateralized Debt Obligations | Debt and Equity Interests
    
Maximum exposure to loss 1,173 [3] 491 [4]
Collateralized Debt Obligations | Debt and Equity Interests | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 1,173 [3] 491 [4]
Collateralized Debt Obligations | Derivative and Other Contracts
    
Maximum exposure to loss 51 843
Carrying value of exposure to loss - Liabilities 2 159
Collateralized Debt Obligations | Derivative and Other Contracts | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 8 657
Collateralized Debt Obligations | Commitments, Guarantees and Other
    
Maximum exposure to loss 0 0
Carrying value of exposure to loss - Liabilities 0 0
Municipal Tender Option Bonds
    
Carrying value of exposure to loss - Assets 3,390 [1] 6,833 [2]
Maximum exposure to loss 2,158 4,342
Carrying value of exposure to loss - Liabilities 0 0
Municipal Tender Option Bonds | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 4 225
Municipal Tender Option Bonds | Debt and Equity Interests
    
Maximum exposure to loss 0 [3] 201 [4]
Municipal Tender Option Bonds | Debt and Equity Interests | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 0 [3] 201 [4]
Municipal Tender Option Bonds | Derivative and Other Contracts
    
Maximum exposure to loss 2,158 4,141
Carrying value of exposure to loss - Liabilities 0 0
Municipal Tender Option Bonds | Derivative and Other Contracts | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 4 24
Municipal Tender Option Bonds | Commitments, Guarantees and Other
    
Maximum exposure to loss 0 0
Carrying value of exposure to loss - Liabilities 0 0
Other Structured Financings
    
Carrying value of exposure to loss - Assets 1,811 [1] 1,944 [2]
Maximum exposure to loss 1,732 1,782
Carrying value of exposure to loss - Liabilities 12 14
Other Structured Financings | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 663 640
Other Structured Financings | Debt and Equity Interests
    
Maximum exposure to loss 1,053 [3] 978 [4]
Other Structured Financings | Debt and Equity Interests | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 663 [3] 640 [4]
Other Structured Financings | Derivative and Other Contracts
    
Maximum exposure to loss 0 0
Carrying value of exposure to loss - Liabilities 0 0
Other Structured Financings | Derivative and Other Contracts | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 0 0
Other Structured Financings | Commitments, Guarantees and Other
    
Maximum exposure to loss 679 804
Carrying value of exposure to loss - Liabilities 12 14
Other
    
Carrying value of exposure to loss - Assets 14,029 [1] 20,997 [2]
Maximum exposure to loss 4,333 4,183
Carrying value of exposure to loss - Liabilities 172 290
Other | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 3,561 2,751
Other | Debt and Equity Interests
    
Maximum exposure to loss 3,387 [3] 2,413 [4]
Other | Debt and Equity Interests | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 3,387 [3] 2,413 [4]
Other | Derivative and Other Contracts
    
Maximum exposure to loss 562 1,209
Carrying value of exposure to loss - Liabilities 172 114
Other | Derivative and Other Contracts | Carrying Value of Exposure to Loss
    
Carrying value of exposure to loss - Assets 174 338
Other | Commitments, Guarantees and Other
    
Maximum exposure to loss 384 561
Carrying value of exposure to loss - Liabilities $ 0 $ 176
[1] Mortgage and asset-backed securitizations include VIE assets as follows: $18.3 billion of residential mortgages; $53.8 billion of commercial mortgages; $126.3 billion of U.S. agency collateralized mortgage obligations; and $53.3 billion of other consumer or commercial loans.
[2] Mortgage and asset-backed securitizations include VIE assets as follows: $9.1 billion of residential mortgages; $81.7 billion of commercial mortgages; $121.6 billion of U.S. agency collateralized mortgage obligations; and $18.7 billion of other consumer or commercial loans. Prior-period amounts were adjusted to conform to the current period’s presentation.
[3] Mortgage and asset-backed securitizations include VIE debt and equity interests as follows: $1.0 billion of residential mortgages; $1.5 billion of commercial mortgages; $14.8 billion of U.S. agency collateralized mortgage obligations; and $5.0 billion of other consumer or commercial loans.
[4] Mortgage and asset-backed securitizations include VIE debt and equity interests as follows: $0.6 billion of residential mortgages; $1.1 billion of commercial mortgages; $13.5 billion of U.S. agency collateralized mortgage obligations; and $1.3 billion of other consumer or commercial loans. Prior-period amounts were adjusted to conform to the current period’s presentation.