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Summary of Changes in Fair Value of Pension Plan Level 3 Assets (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Balance as of January 1 $ 8 $ 7
Purchases, sales and settlements, net 2 1
Balance as of December 31 $ 10 $ 8