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Activities Relating to Capitalized Software (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Indefinite-lived Intangible Assets [Line Items]      
Ending balance $ 195 $ 173  
Internal-Use Software
     
Indefinite-lived Intangible Assets [Line Items]      
Beginning balance 12 11 11
Capitalized 6 6 5
Amortization (6) (5) (5)
Ending balance 12 12 11
External-Use Software
     
Indefinite-lived Intangible Assets [Line Items]      
Beginning balance 161 129 105
Capitalized 72 75 63
Amortization (50) (43) (39)
Ending balance $ 183 $ 161 $ 129