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Financial Instruments and Risk Management - Derivative Instruments Not Designated as Hedge (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total $ 115 $ 291
Debt Securities Issued by the U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments   150
Euro Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments 27 59
U.S.-Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments 30 29
Available-for-Sale Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments 11 10
Equity Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments 8 8
Cash Flow Hedging [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments designated as cash flow hedge 38 29
Not Designated as Hedging Instrument [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments designated as cash flow hedge 1 6
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 76 256
Fair Value, Inputs, Level 1 [Member] | Debt Securities Issued by the U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments   150
Fair Value, Inputs, Level 1 [Member] | Euro Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments 27 59
Fair Value, Inputs, Level 1 [Member] | U.S.-Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments 30 29
Fair Value, Inputs, Level 1 [Member] | Available-for-Sale Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments 11 10
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments 8 8
Fair Value, Inputs, Level 1 [Member] | Cash Flow Hedging [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments designated as cash flow hedge      
Fair Value, Inputs, Level 1 [Member] | Not Designated as Hedging Instrument [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments designated as cash flow hedge      
Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 39 35
Fair Value, Inputs, Level 2 [Member] | Debt Securities Issued by the U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments     
Fair Value, Inputs, Level 2 [Member] | Euro Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments      
Fair Value, Inputs, Level 2 [Member] | U.S.-Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments      
Fair Value, Inputs, Level 2 [Member] | Available-for-Sale Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments      
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments      
Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments designated as cash flow hedge 38 29
Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments designated as cash flow hedge 1 6
Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total      
Fair Value, Inputs, Level 3 [Member] | Debt Securities Issued by the U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments     
Fair Value, Inputs, Level 3 [Member] | Euro Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments      
Fair Value, Inputs, Level 3 [Member] | U.S.-Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments      
Fair Value, Inputs, Level 3 [Member] | Available-for-Sale Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments      
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities issued by foreign governments      
Fair Value, Inputs, Level 3 [Member] | Cash Flow Hedging [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments designated as cash flow hedge      
Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments designated as cash flow hedge