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Aggregate Amortization Expense for Internal and External-Use Software (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Acquired Intangible Assets Amortization [Line Items]  
Amortization expense - Actual 2013 $ 44
Amortization expense - 2014 45
Amortization expense - 2015 37
Amortization expense - 2016 27
Amortization expense - 2017 18
Amortization expense - 2018 7
Internal-Use Software
  
Acquired Intangible Assets Amortization [Line Items]  
Amortization expense - Actual 2013 6
Amortization expense - 2014 5
Amortization expense - 2015 4
Amortization expense - 2016 2
Amortization expense - 2017 1
Amortization expense - 2018 0
External-Use Software
  
Acquired Intangible Assets Amortization [Line Items]  
Amortization expense - Actual 2013 50
Amortization expense - 2014 62
Amortization expense - 2015 54
Amortization expense - 2016 41
Amortization expense - 2017 21
Amortization expense - 2018 $ 5