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Financial Instruments and Risk Management - Schedule of Assets (Liabilities) Measured at Fair Value on Non-Recurring Basis (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets held for sale $ 16
Total assets   
Fair Value, Inputs, Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets held for sale   
Total assets   
Fair Value, Inputs, Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets held for sale   
Total assets   
Fair Value, Inputs, Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assets held for sale 16
Total assets