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Net Interest Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Interest Income Expense Net        
Interest expense, net of capitalized interest $ 16 $ 36 $ 49 $ 71
Interest income (5) (6) (10) (11)
Net interest expense $ 11 $ 30 $ 39 $ 60