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Contractual Amounts Due under Leases (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Receivables [Abstract]    
Due within one year $ 103  
Due within two years 69  
Due within three years 58  
Thereafter 1  
Total 231 329
Less amounts representing interest (5)  
Present value 226  
Current portion (included in accounts and notes receivable) 100  
Long-term portion (included in other assets, net) $ 126