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Interest and Other Expense Net Within Results of Continuing Operations (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Debt Instrument [Line Items]        
Interest expense, debt $ 89 $ 129 $ 295 $ 400
Loss on debt extinguishment     11  
Loss related to interest rate swaps       97
Other (income)/expense, net (70) 16 (44) 43
Interest and other expense, net $ 19 $ 145 $ 262 $ 540