v2.4.0.6
Fair Values of Assets and Liabilities Textuals (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Securities available for sale $ 248,160,000,000   $ 235,199,000,000
Net unrealized gains (losses) on trading securities (141,000,000) 138,000,000 305,000,000
Mortgages held for sale 42,624,000,000   42,305,000,000
Loans 799,966,000,000   799,574,000,000
Capital Lease Obligation 12,000,000   12,000,000
Private Equity Funds [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Liquidation period 8 years    
Venture Capital Funds [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Liquidation period 5 years    
Offshore Funds [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Redemption restriction for investment 216,000,000   189,000,000
Lease Financing [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Loans 12,402,000,000   12,424,000,000
Non modified loans [Member] | Maximum [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Cost to service per loan 383   437
Non modified loans [Member] | Minimum [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Cost to service per loan 90   90
Residential [Member] | Government Insured Or Guaranteed [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Mortgages held for sale 942,000,000   942,000,000
Residential [Member] | Non Government Insured Or Guaranteed [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Mortgages held for sale 100,000,000   103,000,000
Consumer [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Loans 438,252,000,000   438,376,000,000
Collateralized debt obligations [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Total trading assets (excluding derivatives) 8,000,000   21,000,000
Securities available for sale 674,000,000   644,000,000
Trading and available for sale securities 682,000,000   665,000,000
Collateralized loan obligations [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Fair Value Disclosure, Transfers from Level 3 to Level 2 202,000,000    
Available for sale Securities [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Fair Value Disclosure, Transfers from Level 3 to Level 2 10,600,000,000    
Carrying amount [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Loan Commitments And Standby, Commercial And Similar Letters of Credit 629,000,000   586,000,000
Estimated fair value [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Loans 774,684,000,000   772,351,000,000
Loan Commitments And Standby, Commercial And Similar Letters of Credit 629,000,000   586,000,000
Estimated fair value [Member] | Level 1 [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Loans 0   0
Estimated fair value [Member] | Level 2 [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Loans 57,607,000,000   56,237,000,000
Estimated fair value [Member] | Level 3 [Member]
     
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Loans $ 717,077,000,000   $ 716,114,000,000