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Fair Value (Additional Fair Value Information Related To Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities $ 2,513 [1] $ 1,826 [1]
Loans held for sale 2,365 [2] 2,755 [2]
Other assets 639 853
Derivative Asset, Fair Value 9,463 5,757
Derivative Liability, Fair Value 7,606 4,935
Carrying Amount [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and short-term assets 8,567 9,711
Trading securities 2,513 1,826
Investment securities 60,634 64,262
Loans held for sale 2,936 3,492
Net loans (excludes leases) 148,254 139,316
Other assets 4,019 4,664
Mortgage servicing rights 1,115 1,698
Demand, savings and money market deposits 156,335 141,990
Time deposits 31,632 41,400
Borrowed funds 36,966 39,821
Unfunded loan commitments and letters of credit 223 173
Carrying Amount [Member] | Designated as Hedging Instrument [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Asset, Fair Value 1,888 1,255
Derivative Liability, Fair Value 116 85
Carrying Amount [Member] | Not Designated As Hedging Instrument [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Asset, Fair Value 7,575 4,502
Derivative Liability, Fair Value 7,490 4,850
Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and short-term assets 8,567 9,711
Trading securities 2,513 1,826
Investment securities 61,018 64,487
Loans held for sale 2,939 3,492
Net loans (excludes leases) 151,167 141,431
Other assets 4,019 4,664
Mortgage servicing rights 1,118 1,707
Demand, savings and money market deposits 156,335 141,990
Time deposits 31,882 41,825
Borrowed funds 39,064 41,273
Unfunded loan commitments and letters of credit 223 173
Fair Value [Member] | Designated as Hedging Instrument [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Asset, Fair Value 1,888 1,255
Derivative Liability, Fair Value 116 85
Fair Value [Member] | Not Designated As Hedging Instrument [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Asset, Fair Value 7,575 4,502
Derivative Liability, Fair Value $ 7,490 $ 4,850
[1] Fair value includes net unrealized gains of $102 million at December 31, 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.