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Schedule of Restructuring Costs (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2013
2012-2014 Restructuring Program
Dec. 31, 2012
2012-2014 Restructuring Program
Dec. 31, 2013
Severance And Related Costs
2012-2014 Restructuring Program
Dec. 31, 2012
Severance And Related Costs
2012-2014 Restructuring Program
Dec. 31, 2013
Asset Write-Downs
2012-2014 Restructuring Program
Dec. 31, 2012
Asset Write-Downs
2012-2014 Restructuring Program
Restructuring Cost and Reserve [Line Items]              
Balance at beginning of period   $ 36   $ 36      
Charges 61 267 102 176 84 91 18
Cash spent   (108) (33) (108) (33)    
Non-cash settlements   (127) (33) (36) (15) (91) (18)
Balance at end of period   $ 68 $ 36 $ 68 $ 36