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Segment Reporting - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Segment
Jun. 30, 2014
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | Segment   5  
Stock-based compensation expense   $ 66 $ 68
Corporate | Scenario, Adjustment      
Segment Reporting Information [Line Items]      
Stock-based compensation expense $ 4 15  
North America Segment | Scenario, Previously Reported      
Segment Reporting Information [Line Items]      
Stock-based compensation expense $ 4 $ 15