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Fair Value (Additional Fair Value Information Related To Financial Instruments) (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Trading securities$ 2,960[1]$ 1,826[1]
Loans held for sale2,184[2]2,755[2]
Other assets622853
Derivative Asset, Fair Value9,608[3]5,757[3]
Derivative Liability, Fair Value7,429[4]4,935[4]
Carrying Amount [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash and short-term assets9,6859,711
Trading securities2,9601,826
Investment securities62,10564,262
Loans held for sale2,4913,492
Net loans (excludes leases)143,854139,316
Other assets4,1904,664
Mortgage servicing rights1,1661,698
Demand, savings and money market deposits151,403141,990
Time deposits36,32941,400
Borrowed funds35,42239,821
Unfunded loan commitments and letters of credit199173
Carrying Amount [Member] | Designated as Hedging Instrument [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Derivative Asset, Fair Value1,9641,255
Derivative Liability, Fair Value13285
Carrying Amount [Member] | Not Designated As Hedging Instrument [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Derivative Asset, Fair Value7,6444,502
Derivative Liability, Fair Value7,2974,850
Fair Value [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash and short-term assets9,6859,711
Trading securities2,9601,826
Investment securities62,43964,487
Loans held for sale2,4943,492
Net loans (excludes leases)147,053141,431
Other assets4,1904,664
Mortgage servicing rights1,1681,707
Demand, savings and money market deposits151,403141,990
Time deposits36,65441,825
Borrowed funds37,49441,273
Unfunded loan commitments and letters of credit199173
Fair Value [Member] | Designated as Hedging Instrument [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Derivative Asset, Fair Value1,9641,255
Derivative Liability, Fair Value13285
Fair Value [Member] | Not Designated As Hedging Instrument [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Derivative Asset, Fair Value7,6444,502
Derivative Liability, Fair Value$ 7,297$ 4,850
[1]Fair value includes net unrealized gains of $71 million at September 30, 2011 compared with net unrealized losses of $17 million at December 31, 2010.
[2]Amounts represent items for which the Corporation has elected the fair value option.
[3]Included in Other Assets on our Consolidated Balance Sheet.
[4]Included in Other Liabilities on our Consolidated Balance Sheet.