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Schedule of Restructuring Costs (Detail) (2012-2014 Restructuring Program, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]    
Balance at beginning of period $ 68  
Charges 42 40
Cash spent (28) (4)
Non-cash settlements (13) (9)
Balance at end of period 69  
Severance And Related Costs
    
Restructuring Cost and Reserve [Line Items]    
Balance at beginning of period 68  
Charges 30  
Cash spent (28)  
Non-cash settlements (1)  
Balance at end of period 69  
Asset Write-Downs
    
Restructuring Cost and Reserve [Line Items]    
Charges 12  
Non-cash settlements $ (12)