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Other Short-Term Borrowings (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Short-term Debt [Line Items]    
Other short-term borrowings balance $ 8,983 $ 2,690
Federal Home Loan Bank Advances [Member]
    
Short-term Debt [Line Items]    
Other short-term borrowings balance 7,000 0
Short-term Debt, Weighted Average Interest Rate 0.14% 0.00%
Other short-term borrowings rates 0.14% 0.00%
Master Notes
    
Short-term Debt [Line Items]    
Other short-term borrowings balance 1,710 1,355
Short-term Debt, Weighted Average Interest Rate 0.40% 0.40%
Other short-term borrowings rates 0.40% 0.40%
Dealer Collateral
    
Short-term Debt [Line Items]    
Other short-term borrowings balance 265 1,005
Short-term Debt, Percentage Bearing Variable Interest Rate      
U.S. government notes
    
Short-term Debt [Line Items]    
Other short-term borrowings balance 0 124
Short-term Debt, Weighted Average Interest Rate 0.00% 0.00%
Other short-term borrowings rates 0.00% 0.00%
Commercial Paper
    
Short-term Debt [Line Items]    
Other short-term borrowings balance 0 99
Short-term Debt, Weighted Average Interest Rate 0.00% 0.51%
Other short-term borrowings rates 0.00% 0.51%
Federal Funds Purchased
    
Short-term Debt [Line Items]    
Other short-term borrowings balance 0 75
Short-term Debt, Weighted Average Interest Rate 0.00% 0.35%
Other short-term borrowings rates 0.00% 0.35%
Other Short-term Borrowings
    
Short-term Debt [Line Items]    
Other short-term borrowings balance $ 8 $ 32
Short-term Debt, Weighted Average Interest Rate 2.70%  
Other short-term borrowings rates 2.70%  
Short-term Debt, Percentage Bearing Variable Interest Rate