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Fair Value (Recurring Fair Value Measurements) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Assets    
Securities available for sale, fair value $ 47,899 $ 51,052
Fair Value Additional Information [Abstract]    
Unfunded contractual commitments 171  
Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 47,602 50,685
Securities available for sale, fair value 47,899 51,052
Total financial derivatives 6,585 8,568
Trading securities 2,109 2,096
Trading Loans 21 76
Total equity investments 1,738 1,813
Total customer resale agreements 210 256
Loans 811 244
Other assets 797 729
Total Assets 64,026 68,352
Liabilities    
Total financial derivatives 5,330 6,610
Total trading securities sold short 932 741
Other liabilities   5
Other borrowed funds 195  
Total liabilities 6,457 7,356
Fair Value Additional Information [Abstract]    
Fair value net derivative assets 2,244 2,430
Fair value net derivative liabilities 1,065 589
Net unrealized gains (losses) (13) 59
Percentage of Trading securities - debt comprised of US Treasury and government agencies securities 61.00% 52.00%
Percentage of Trading securities - debt comprised of residential mortgage-backed securities 23.00% 25.00%
Trading securities 2,109 2,096
US Treasury and Government Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 2,210 3,113
Residential mortgage-backed Securities | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 24,248 26,784
Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 5,852 6,107
Commercial mortgage-backed securities [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 595 633
Commercial mortgage-backed securities [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 3,679 3,264
Asset backed [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 6,034 5,653
State and Municipal [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 2,217 2,287
Other Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 2,767 2,844
Corporate Stocks And Other [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Securities available for sale, fair value 297 367
Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total financial derivatives 6,325 8,432
Liabilities    
Total financial derivatives 4,831 6,118
BlackRock LTIP [Member] | Fair Value, Measurements, Recurring [Member]
   
Liabilities    
Total financial derivatives 270 243
Other Contracts [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total financial derivatives 260 136
Liabilities    
Total financial derivatives 229 249
Residential Mortgage [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Loans held for sale 2,246 2,096
Mortgage servicing rights 975 650
Commercial Mortgage [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Loans held for sale 635 772
Direct Equity Investments [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total equity investments 1,115 1,171
Fair Value Additional Information [Abstract]    
Unfunded contractual commitments 37  
Indirect Equity Investments [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total equity investments 623 642
Fair Value Additional Information [Abstract]    
Unfunded contractual commitments 134  
Number of years over which distributions from indirect equity funds are expected to be received 12 years  
BlackRock Series C Preferred Stock | Fair Value, Measurements, Recurring [Member]
   
Assets    
Other assets 270 243
Other Assets | Fair Value, Measurements, Recurring [Member]
   
Assets    
Other assets 527 486
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Trading securities 2,090 2,045
Liabilities    
Total trading securities sold short 932 741
Fair Value Additional Information [Abstract]    
Trading securities 2,090 2,045
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Trading securities 19 51
Fair Value Additional Information [Abstract]    
Trading securities 19 51
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 1,480 2,269
Securities available for sale, fair value 1,761 2,620
Total financial derivatives 27 5
Trading securities 1,296 1,104
Other assets 330 283
Total Assets 3,414 4,012
Liabilities    
Total financial derivatives 12 1
Total trading securities sold short 929 731
Total liabilities 941 732
Fair Value Additional Information [Abstract]    
Trading securities 1,296 1,104
Level 1 [Member] | US Treasury and Government Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 1,480 2,269
Level 1 [Member] | Corporate Stocks And Other [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Securities available for sale, fair value 281 351
Level 1 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total financial derivatives 27 5
Liabilities    
Total financial derivatives 12 1
Level 1 [Member] | Other Assets | Fair Value, Measurements, Recurring [Member]
   
Assets    
Other assets 330 283
Level 1 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Trading securities 1,277 1,062
Liabilities    
Total trading securities sold short 929 731
Fair Value Additional Information [Abstract]    
Trading securities 1,277 1,062
Level 1 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Trading securities 19 42
Fair Value Additional Information [Abstract]    
Trading securities 19 42
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 39,360 41,214
Securities available for sale, fair value 39,376 41,230
Total financial derivatives 6,507 8,457
Trading securities 781 960
Trading Loans 21 76
Total customer resale agreements 210 256
Loans 500 110
Other assets 189 194
Total Assets 49,800 53,352
Liabilities    
Total financial derivatives 4,935 6,233
Total trading securities sold short 3 10
Other liabilities   5
Total liabilities 4,938 6,248
Fair Value Additional Information [Abstract]    
Trading securities 781 960
Level 2 [Member] | US Treasury and Government Agencies Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 730 844
Level 2 [Member] | Residential mortgage-backed Securities | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 24,248 26,784
Level 2 [Member] | Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 141  
Level 2 [Member] | Commercial mortgage-backed securities [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 595 633
Level 2 [Member] | Commercial mortgage-backed securities [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 3,679 3,264
Level 2 [Member] | Asset backed [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 5,362 4,945
Level 2 [Member] | State and Municipal [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 1,886 1,948
Level 2 [Member] | Other Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 2,719 2,796
Level 2 [Member] | Corporate Stocks And Other [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Securities available for sale, fair value 16 16
Level 2 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total financial derivatives 6,248 8,326
Liabilities    
Total financial derivatives 4,771 6,105
Level 2 [Member] | Other Contracts [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total financial derivatives 259 131
Liabilities    
Total financial derivatives 164 128
Level 2 [Member] | Residential Mortgage [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Loans held for sale 2,216 2,069
Level 2 [Member] | Other Assets | Fair Value, Measurements, Recurring [Member]
   
Assets    
Other assets 189 194
Level 2 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Trading securities 781 951
Liabilities    
Total trading securities sold short 3 10
Fair Value Additional Information [Abstract]    
Trading securities 781 951
Level 2 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Trading securities   9
Fair Value Additional Information [Abstract]    
Trading securities   9
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 6,762 7,202
Securities available for sale, fair value 6,762 7,202
Total financial derivatives 51 106
Trading securities 32 32
Total equity investments 1,738 1,813
Loans 311 134
Other assets 278 252
Total Assets 10,812 10,988
Liabilities    
Total financial derivatives 383 376
Other borrowed funds 195  
Total liabilities 578 376
Fair Value Additional Information [Abstract]    
Trading securities 32 32
Level 3 [Member] | Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 5,711 6,107
Level 3 [Member] | Asset backed [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 672 708
Level 3 [Member] | State and Municipal [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 331 339
Level 3 [Member] | Other Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total debt securities 48 48
Level 3 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total financial derivatives 50 101
Liabilities    
Total financial derivatives 48 12
Level 3 [Member] | BlackRock LTIP [Member] | Fair Value, Measurements, Recurring [Member]
   
Liabilities    
Total financial derivatives 270 243
Level 3 [Member] | Other Contracts [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total financial derivatives 1 5
Liabilities    
Total financial derivatives 65 121
Level 3 [Member] | Residential Mortgage [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Loans held for sale 30 27
Mortgage servicing rights 975 650
Level 3 [Member] | Commercial Mortgage [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Loans held for sale 635 772
Level 3 [Member] | Direct Equity Investments [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total equity investments 1,115 1,171
Level 3 [Member] | Indirect Equity Investments [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Total equity investments 623 642
Level 3 [Member] | BlackRock Series C Preferred Stock | Fair Value, Measurements, Recurring [Member]
   
Assets    
Other assets 270 243
Level 3 [Member] | Other Assets | Fair Value, Measurements, Recurring [Member]
   
Assets    
Other assets 8 9
Level 3 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
   
Assets    
Trading securities 32 32
Fair Value Additional Information [Abstract]    
Trading securities $ 32 $ 32