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Total Assets by Segment (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Deferred debt issuance costs $ 46 $ 44 $ 51
Latin America Segment | Venezuela      
Segment Reporting Information [Line Items]      
Decrease in assets from deconsolidation of Venezuela $ (1,100)