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Employee Benefit Plans - Summary of Changes in Fair Value of Plan's Level Three Assets (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at end of year $ 706 $ 517
Fair Value, Inputs, Level 3 [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 100 77
Actual return on plan assets still held at reporting date 5 10
Purchases, sales and settlements 5 8
Currency translation adjustments (3) 5
Fair value of plan assets at end of year $ 107 $ 100