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Fair Value Measurements (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale $ 27,232,000,000 $ 24,471,000,000
Loans held for sale 950,000,000 844,000,000
Other interest-earning assets 901,000,000 1,085,000,000
Short-term borrowings 3,306,000,000 3,067,000,000
Long-term borrowings 6,230,000,000 8,110,000,000
Fair value discount on loan portfolio, amount 7,400,000,000 8,100,000,000
Fair value discount on loan portfolio, rate 10.20% 11.00%
Leases, carrying amount excluded 1,500,000,000 1,600,000,000
Carrying Amount [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 3,766,000,000 7,245,000,000
Trading account assets 110,000,000 1,266,000,000
Securities available for sale 27,232,000,000 24,471,000,000
Securities held to maturity 13,000,000 16,000,000
Loans held for sale 1,187,000,000 1,193,000,000
Loans (excluding leases), net of unearned income and allowance for loan losses 72,427,000,000 [1],[2] 73,284,000,000 [3],[4]
Other interest-earning assets 901,000,000 1,085,000,000
Derivatives, net 124,000,000 339,000,000
Deposits 95,098,000,000 95,627,000,000
Short-term borrowings 3,306,000,000 3,067,000,000
Long-term borrowings 6,230,000,000 8,110,000,000
Loan commitments and letters of credit 129,000,000 117,000,000
Indemnification obligation 383,000,000  
Fair Value Inputs Total [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 3,766,000,000 [5]  
Trading account assets 110,000,000 [5]  
Securities available for sale 27,232,000,000 [5]  
Securities held to maturity 14,000,000 [5]  
Loans held for sale 1,187,000,000 [5]  
Loans (excluding leases), net of unearned income and allowance for loan losses 65,046,000,000 [1],[2],[5]  
Other interest-earning assets 901,000,000 [5]  
Derivatives, net 124,000,000 [5]  
Deposits 95,204,000,000 [5]  
Short-term borrowings 3,306,000,000 [5]  
Long-term borrowings 6,013,000,000 [5]  
Loan commitments and letters of credit 640,000,000 [5]  
Indemnification obligation 383,000,000 [5]  
Fair Value Inputs Level 1 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 3,766,000,000  
Trading account assets 110,000,000  
Securities available for sale 158,000,000  
Securities held to maturity 3,000,000  
Long-term borrowings 291,000,000  
Fair Value Inputs Level 2 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 27,058,000,000  
Securities held to maturity 11,000,000  
Loans held for sale 981,000,000  
Other interest-earning assets 901,000,000  
Derivatives, net 94,000,000  
Deposits 95,204,000,000  
Short-term borrowings 3,306,000,000  
Fair Value Inputs Level 3 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 16,000,000  
Loans held for sale 206,000,000  
Loans (excluding leases), net of unearned income and allowance for loan losses 65,046,000,000 [1],[2]  
Derivatives, net 30,000,000  
Long-term borrowings 5,722,000,000  
Loan commitments and letters of credit 640,000,000  
Indemnification obligation 383,000,000  
Estimated Fair Value [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents   7,245,000,000 [5]
Trading account assets   1,266,000,000 [5]
Securities available for sale   24,471,000,000 [5]
Securities held to maturity   17,000,000 [5]
Loans held for sale   1,193,000,000 [5]
Loans (excluding leases), net of unearned income and allowance for loan losses   65,224,000,000 [3],[4],[5]
Other interest-earning assets   1,085,000,000 [5]
Derivatives, net   339,000,000 [5]
Deposits   95,757,000,000 [5]
Short-term borrowings   3,067,000,000 [5]
Long-term borrowings   7,439,000,000 [5]
Loan commitments and letters of credit   $ 756,000,000 [5]
[1] The estimated fair value of portfolio loans assumes sale of the loans to a third-party financial investor. Accordingly, the value to the Company if the loans were held to maturity is not reflected in the fair value estimate. In the current whole loan market, financial investors are generally requiring a higher rate of return than the return inherent in loans if held to maturity. The fair value discount at June 30, 2012 was $7.4 billion or 10.2 percent.
[2] Excluded from this table is the lease carrying amount of $1.5 billion at June 30, 2012.
[3] Excluded from this table is the lease carrying amount of $1.6 billion at December 31, 2011.
[4] The estimated fair value of portfolio loans assumes sale of the loans to a third-party financial investor. Accordingly, the value to the Company if the loans were held to maturity is not reflected in the fair value estimate. In the current whole loan market, financial investors are generally requiring a higher rate of return than the return inherent in loans if held to maturity. The fair value discount at December 31, 2011 was $8.1 billion or 11.0 percent.
[5] Estimated fair values are consistent with an exit price concept. The assumptions used to estimate the fair values are intended to approximate those that a market participant would use in a hypothetical orderly transaction. In estimating fair value, the Company makes adjustments for interest rates, market liquidity and credit spreads as appropriate.