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Other Income (Expense), Net - Other, Net, Included in Other Income (Expense), Net (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other Income And Expenses [Abstract]        
Income from cash and cash investments $ 1 $ 2 $ 2 $ 4
Income from financial investments (Note E) 5 2 8 18
Impairment of financial investments (Note E)    (2)    (2)
Other items, net (3)     (3)
Total other net $ 3 $ 2 $ 10 $ 17