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Stock-Based Compensation - Summary of Stock-Based Compensation Expense Recorded in Selling, General and Administrative Expenses (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Incentive Stock Option Plan [Member]
      
Stock Based Compensation [Line Items]      
Incentive Stock Option Plan $ 40 $ 42 $ 31
Selling, general and administrative expenses [Member]
      
Stock Based Compensation [Line Items]      
Incentive Stock Option Plan 35 38 34
Selling, general and administrative expenses [Member] | Incentive Stock Option Plan [Member]
      
Stock Based Compensation [Line Items]      
Incentive Stock Option Plan 15 19 21
Selling, general and administrative expenses [Member] | Long-term retention [Member]
      
Stock Based Compensation [Line Items]      
Incentive Stock Option Plan 4 5 7
Selling, general and administrative expenses [Member] | Restricted stock unit [Member]
      
Stock Based Compensation [Line Items]      
Incentive Stock Option Plan 16 14 6
Selling, general and administrative expenses [Member] | Fair value adjustment for liability classified DSUs [Member]
      
Stock Based Compensation [Line Items]      
Incentive Stock Option Plan $ 5 $ 4 $ (3)