Restructuring and Other Special Charges, Net - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 8    
Other special charges 23    
Restructuring and other special charges, net 31 0  
Other Special Restructuring Charges [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserves 23   15
Prior President and Chief Executive Officer Severance Charge [Member]      
Restructuring Cost and Reserve [Line Items]      
Other special charges 7    
Litigation Reserve [Member]      
Restructuring Cost and Reserve [Line Items]      
Other special charges 6    
Spinoff [Member]      
Restructuring Cost and Reserve [Line Items]      
Other special charges $ 6