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Contingencies - Tronox Litigation (Detail) - Tronox Litigation [Member] - Judicial Ruling [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Loss Contingencies [Line Items]                
Litigation-related contingent liability $ 0     $ 5,150   $ 0   $ 5,210
Payment for Tronox settlement   $ 5,200            
Litigation-related contingent loss $ 0   $ 19 $ 4,300 $ 850 $ 5 $ 4,319  
Post Settlement Interest Expense [Member]                
Loss Contingencies [Line Items]                
Litigation-related contingent loss   $ 5           $ 60