XML 71 R54.htm IDEA: XBRL DOCUMENT v3.8.0.1
Net Interest Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest Income Expense Net      
Interest costs $ 98 $ 107 $ 197
Interest costs capitalized (13) (18) (51)
Interest expense 85 89 146
Interest income (30) (23) (20)
Net interest expense $ 55 $ 66 $ 126