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Contractual Amounts Due under Leases (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Receivables [Abstract]    
Due within one year $ 123  
Due within two years 81  
Due within three years 70  
Thereafter 2  
Total 276 329
Less amounts representing interest (5)  
Present value 271  
Current portion (included in accounts and notes receivable) 130  
Long-term portion (included in other assets, net) $ 141