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Fair Value (Recurring Fair Value Measurements) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Assets    
Total debt securities $ 51,812 $ 48,200
Securities available for sale, fair value 52,133 48,568
Total financial derivatives 9,833 9,463
Loans held for sale 2,288 2,365
Trading securities 2,664 2,513
Trading Loans 22  
Total equity investments 1,752 1,504
Total customer resale agreements 462 732
Loans 314 227
Other assets 697 639
Total Assets 70,759 66,658
Liabilities    
Total financial derivatives 7,696 7,606
Total trading securities sold short 703 1,016
Other liabilities 2 3
Total liabilities 8,401 8,625
Fair Value Additional Information [Abstract]    
Fair value net derivative assets 2,775 2,360
Fair value net derivative liabilities 658 711
Net unrealized gains (losses) 107 102
Percentage of Trading securities - debt comprised of US Treasury and government agencies securities 53.00% 34.00%
Percentage of Trading securities - debt comprised of residential mortgage-backed securities 27.00% 57.00%
Trading securities 2,664 2,513
Unfunded contractual commitments 201  
Number of years over which distributions from indirect equity funds are expected to be received 12 years  
US Treasury and Government Agencies Securities [Member]
   
Assets    
Total debt securities 3,024 3,717
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Agency [Member]
   
Assets    
Total debt securities 27,930 26,792
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member]
   
Assets    
Total debt securities 6,220 5,557
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Agency [Member]
   
Assets    
Total debt securities 651 1,140
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Non-agency [Member]
   
Assets    
Total debt securities 3,281 2,756
Asset backed [Member]
   
Assets    
Total debt securities 5,539 3,669
State and Municipal [Member]
   
Assets    
Total debt securities 2,049 1,807
Other Debt Securities [Member]
   
Assets    
Total debt securities 3,118 2,762
Corporate Stocks And Other [Member]
   
Assets    
Securities available for sale, fair value 321 368
Interest Rate Contracts [Member]
   
Assets    
Total financial derivatives 9,663 9,210
Liabilities    
Total financial derivatives 7,191 7,071
Black Rock LTIP [Member]
   
Liabilities    
Total financial derivatives 210 210
Other Contract [Member]
   
Assets    
Total financial derivatives 170 253
Liabilities    
Total financial derivatives 295 325
Residential Mortgages [Member]
   
Assets    
Loans held for sale 1,477 1,522
Residential Mortgage Servicing Rights MSRs [Member]
   
Assets    
Mortgage servicing rights 594 647
Commercial Mortgages [Member]
   
Assets    
Loans held for sale 811 843
Direct Investments Equity [Member]
   
Assets    
Total equity investments 1,094 856
Fair Value Additional Information [Abstract]    
Unfunded contractual commitments 37  
Indirect Investments Equity [Member]
   
Assets    
Total equity investments 658 648
Fair Value Additional Information [Abstract]    
Unfunded contractual commitments 164  
Black Rock Series C Preferred Stock [Member]
   
Assets    
Other assets 210 210
Other Assets
   
Assets    
Other assets 487 429
Debt Securities [Member]
   
Assets    
Trading securities 2,609 2,468
Liabilities    
Total trading securities sold short 703 1,016
Fair Value Additional Information [Abstract]    
Trading securities 2,609 2,468
Equity Securities [Member]
   
Assets    
Trading securities 55 45
Fair Value Additional Information [Abstract]    
Trading securities 55 45
Residential mortgage-backed agency securities with embedded derivatives
   
Assets    
Trading securities   1,100
Fair Value Additional Information [Abstract]    
Trading securities   1,100
Level 1 [Member]
   
Assets    
Total debt securities 2,130 1,659
Securities available for sale, fair value 2,435 2,027
Total financial derivatives 19  
Trading securities 1,470 1,100
Other assets 279  
Total Assets 4,203 3,127
Liabilities    
Total financial derivatives 6  
Total trading securities sold short 688 997
Total liabilities 694 997
Fair Value Additional Information [Abstract]    
Trading securities 1,470 1,100
Level 1 [Member] | US Treasury and Government Agencies Securities [Member]
   
Assets    
Total debt securities 2,130 1,659
Level 1 [Member] | Corporate Stocks And Other [Member]
   
Assets    
Securities available for sale, fair value 305 368
Level 1 [Member] | Interest Rate Contracts [Member]
   
Assets    
Total financial derivatives 19  
Liabilities    
Total financial derivatives 6  
Level 1 [Member] | Other Assets
   
Assets    
Other assets 279  
Level 1 [Member] | Debt Securities [Member]
   
Assets    
Trading securities 1,424 1,058
Liabilities    
Total trading securities sold short 688 997
Fair Value Additional Information [Abstract]    
Trading securities 1,424 1,058
Level 1 [Member] | Equity Securities [Member]
   
Assets    
Trading securities 46 42
Fair Value Additional Information [Abstract]    
Trading securities 46 42
Level 2 [Member]
   
Assets    
Total debt securities 42,355 39,812
Securities available for sale, fair value 42,371 39,812
Total financial derivatives 9,667 9,396
Trading securities 1,162 1,374
Trading Loans 22  
Total customer resale agreements 462 732
Loans 307 222
Other assets 199 422
Total Assets 55,667 53,480
Liabilities    
Total financial derivatives 7,360 7,298
Total trading securities sold short 15 19
Other liabilities 2 3
Total liabilities 7,377 7,320
Fair Value Additional Information [Abstract]    
Trading securities 1,162 1,374
Level 2 [Member] | US Treasury and Government Agencies Securities [Member]
   
Assets    
Total debt securities 894 2,058
Level 2 [Member] | Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Agency [Member]
   
Assets    
Total debt securities 27,930 26,792
Level 2 [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Agency [Member]
   
Assets    
Total debt securities 651 1,140
Level 2 [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Non-agency [Member]
   
Assets    
Total debt securities 3,281 2,756
Level 2 [Member] | Asset backed [Member]
   
Assets    
Total debt securities 4,825 2,882
Level 2 [Member] | State and Municipal [Member]
   
Assets    
Total debt securities 1,708 1,471
Level 2 [Member] | Other Debt Securities [Member]
   
Assets    
Total debt securities 3,066 2,713
Level 2 [Member] | Corporate Stocks And Other [Member]
   
Assets    
Securities available for sale, fair value 16  
Level 2 [Member] | Interest Rate Contracts [Member]
   
Assets    
Total financial derivatives 9,504 9,150
Liabilities    
Total financial derivatives 7,169 7,065
Level 2 [Member] | Other Contract [Member]
   
Assets    
Total financial derivatives 163 246
Liabilities    
Total financial derivatives 191 233
Level 2 [Member] | Residential Mortgages [Member]
   
Assets    
Loans held for sale 1,477 1,522
Level 2 [Member] | Other Assets
   
Assets    
Other assets 199 422
Level 2 [Member] | Debt Securities [Member]
   
Assets    
Trading securities 1,153 1,371
Liabilities    
Total trading securities sold short 15 19
Fair Value Additional Information [Abstract]    
Trading securities 1,153 1,371
Level 2 [Member] | Equity Securities [Member]
   
Assets    
Trading securities 9 3
Fair Value Additional Information [Abstract]    
Trading securities 9 3
Level 3 [Member]
   
Assets    
Total debt securities 7,327 6,729
Securities available for sale, fair value 7,327 6,729
Total financial derivatives 147 67
Trading securities 32 39
Total equity investments 1,752 1,504
Loans 7 5
Other assets 219 217
Total Assets 10,889 10,051
Liabilities    
Total financial derivatives 330 308
Total liabilities 330 308
Fair Value Additional Information [Abstract]    
Trading securities 32 39
Level 3 [Member] | Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member]
   
Assets    
Total debt securities 6,220 5,557
Level 3 [Member] | Asset backed [Member]
   
Assets    
Total debt securities 714 787
Level 3 [Member] | State and Municipal [Member]
   
Assets    
Total debt securities 341 336
Level 3 [Member] | Other Debt Securities [Member]
   
Assets    
Total debt securities 52 49
Level 3 [Member] | Interest Rate Contracts [Member]
   
Assets    
Total financial derivatives 140 60
Liabilities    
Total financial derivatives 16 6
Level 3 [Member] | Black Rock LTIP [Member]
   
Liabilities    
Total financial derivatives 210 210
Level 3 [Member] | Other Contract [Member]
   
Assets    
Total financial derivatives 7 7
Liabilities    
Total financial derivatives 104 92
Level 3 [Member] | Residential Mortgage Servicing Rights MSRs [Member]
   
Assets    
Mortgage servicing rights 594 647
Level 3 [Member] | Commercial Mortgages [Member]
   
Assets    
Loans held for sale 811 843
Level 3 [Member] | Direct Investments Equity [Member]
   
Assets    
Total equity investments 1,094 856
Level 3 [Member] | Indirect Investments Equity [Member]
   
Assets    
Total equity investments 658 648
Level 3 [Member] | Black Rock Series C Preferred Stock [Member]
   
Assets    
Other assets 210 210
Level 3 [Member] | Other Assets
   
Assets    
Other assets 9 7
Level 3 [Member] | Debt Securities [Member]
   
Assets    
Trading securities 32 39
Fair Value Additional Information [Abstract]    
Trading securities $ 32 $ 39