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Significant Continuing Involvement - Unconsolidated VIEs (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Variable Interest Entity [Line Items]    
Total VIE assets $ 1,452,380 $ 1,442,219
Debt and equity interests [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 38,703 42,766
Maximum exposure to loss 38,703 42,766
Debt and equity interests [Member] | Conforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 5,389 5,527
Maximum exposure to loss 5,389 5,527
Debt and equity interests [Member] | Other/Nonconforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 2,766 2,997
Maximum exposure to loss 2,766 2,997
Debt and equity interests [Member] | Commercial [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 5,568 5,506
Maximum exposure to loss 5,568 5,506
Debt and equity interests [Member] | Collateralized Debt Obligations Debt Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 1,233 1,436
Maximum exposure to loss 1,233 1,436
Debt and equity interests [Member] | Collateralized Debt Obligations Loans [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 9,722 9,689
Maximum exposure to loss 9,722 9,689
Debt and equity interests [Member] | Asset-based finance structures [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 4,102 6,556
Maximum exposure to loss 4,102 6,556
Debt and equity interests [Member] | Tax Credit Structures [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 3,759 3,614
Maximum exposure to loss 3,759 3,614
Debt and equity interests [Member] | Collateralized loan obligations [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 2,619 2,804
Maximum exposure to loss 2,619 2,804
Debt and equity interests [Member] | Investment funds [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 1,457 1,416
Maximum exposure to loss 1,457 1,416
Debt and equity interests [Member] | Other securitizations and transactions [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 2,088 3,221
Maximum exposure to loss 2,088 3,221
Servicing assets [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 13,821 13,261
Maximum exposure to loss 13,821 13,261
Servicing assets [Member] | Conforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 12,711 12,115
Maximum exposure to loss 12,711 12,115
Servicing assets [Member] | Other/Nonconforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 456 495
Maximum exposure to loss 456 495
Servicing assets [Member] | Commercial [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 617 608
Maximum exposure to loss 617 608
Servicing assets [Member] | Collateralized Debt Obligations Debt Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Servicing assets [Member] | Collateralized Debt Obligations Loans [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Servicing assets [Member] | Asset-based finance structures [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Servicing assets [Member] | Tax Credit Structures [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Servicing assets [Member] | Collateralized loan obligations [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Servicing assets [Member] | Investment funds [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Servicing assets [Member] | Other securitizations and transactions [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 37 43
Maximum exposure to loss 37 43
Variable Interest Entity Derivatives [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 1,250 1,426
Maximum exposure to loss 4,100 4,434
Variable Interest Entity Derivatives [Member] | Conforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Variable Interest Entity Derivatives [Member] | Other/Nonconforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 2 6
Maximum exposure to loss 2 6
Variable Interest Entity Derivatives [Member] | Commercial [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 266 261
Maximum exposure to loss 491 488
Variable Interest Entity Derivatives [Member] | Collateralized Debt Obligations Debt Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 766 844
Maximum exposure to loss 2,689 2,850
Variable Interest Entity Derivatives [Member] | Collateralized Debt Obligations Loans [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Variable Interest Entity Derivatives [Member] | Asset-based finance structures [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) (98) (118)
Maximum exposure to loss 98 118
Variable Interest Entity Derivatives [Member] | Tax Credit Structures [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Variable Interest Entity Derivatives [Member] | Collateralized loan obligations [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 58 56
Maximum exposure to loss 58 56
Variable Interest Entity Derivatives [Member] | Investment funds [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Variable Interest Entity Derivatives [Member] | Other securitizations and transactions [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 256 377
Maximum exposure to loss 762 916
Other commitments and guarantees [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) (2,265) (2,170)
Maximum exposure to loss 6,692 7,432
Other commitments and guarantees [Member] | Conforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) (975) (928)
Maximum exposure to loss 3,487 4,248
Other commitments and guarantees [Member] | Other/Nonconforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) (2) (107)
Maximum exposure to loss 265 233
Other commitments and guarantees [Member] | Commercial [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Other commitments and guarantees [Member] | Collateralized Debt Obligations Debt Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 1 7
Other commitments and guarantees [Member] | Collateralized Debt Obligations Loans [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 0 0
Other commitments and guarantees [Member] | Asset-based finance structures [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 2,216 2,175
Other commitments and guarantees [Member] | Tax Credit Structures [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) (1,285) (1,129)
Maximum exposure to loss 0 1
Other commitments and guarantees [Member] | Collateralized loan obligations [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 521 519
Other commitments and guarantees [Member] | Investment funds [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 0 0
Maximum exposure to loss 52 87
Other commitments and guarantees [Member] | Other securitizations and transactions [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) (3) (6)
Maximum exposure to loss 150 162
Net assets [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 51,509 55,283
Maximum exposure to loss 63,316 67,893
Net assets [Member] | Conforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 17,125 16,714
Maximum exposure to loss 21,587 21,890
Net assets [Member] | Other/Nonconforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 3,222 3,391
Maximum exposure to loss 3,489 3,731
Net assets [Member] | Commercial [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 6,451 6,375
Maximum exposure to loss 6,676 6,602
Net assets [Member] | Collateralized Debt Obligations Debt Securities [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 1,999 2,280
Maximum exposure to loss 3,923 4,293
Net assets [Member] | Collateralized Debt Obligations Loans [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 9,722 9,689
Maximum exposure to loss 9,722 9,689
Net assets [Member] | Asset-based finance structures [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 4,004 6,438
Maximum exposure to loss 6,416 8,849
Net assets [Member] | Tax Credit Structures [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 2,474 2,485
Maximum exposure to loss 3,759 3,615
Net assets [Member] | Collateralized loan obligations [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 2,677 2,860
Maximum exposure to loss 3,198 3,379
Net assets [Member] | Investment funds [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 1,457 1,416
Maximum exposure to loss 1,509 1,503
Net assets [Member] | Other securitizations and transactions [Member]
    
Variable Interest Entity [Line Items]    
Carrying value asset (liability) 2,378 3,635
Maximum exposure to loss 3,037 4,342
Conforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Total VIE assets 1,107,281 1,068,737
Other/Nonconforming Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
Total VIE assets 67,786 76,304
Commercial [Member]
    
Variable Interest Entity [Line Items]    
Total VIE assets 184,762 190,377
Collateralized Debt Obligations Debt Securities [Member]
    
Variable Interest Entity [Line Items]    
Total VIE assets 17,956 20,046
Collateralized Debt Obligations Loans [Member]
    
Variable Interest Entity [Line Items]    
Total VIE assets 9,973 9,970
Asset-based finance structures [Member]
    
Variable Interest Entity [Line Items]    
Total VIE assets 6,273 12,055
Tax Credit Structures [Member]
    
Variable Interest Entity [Line Items]    
Total VIE assets 18,281 20,981
Collateralized loan obligations [Member]
    
Variable Interest Entity [Line Items]    
Total VIE assets 12,879 13,196
Investment funds [Member]
    
Variable Interest Entity [Line Items]    
Total VIE assets 8,238 10,522
Other securitizations and transactions [Member]
    
Variable Interest Entity [Line Items]    
Total VIE assets $ 18,951 $ 20,031