Fair Value of Financial Assets (Parenthetical) (Detail) (Foreign currency derivative, 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]
Foreign currency derivative contract, notional amount	$ 1,800	$ 3,400
Net Investment Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contract, notional amount	$ 1,300	$ 3,000