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Other Long-Term Liabilities Long Term Finance Lease Obligation (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Other Liabilities Disclosure [Abstract]    
Gross finance lease obligations $ 2,390  
Less imputed interest (555)  
Present value of net minimum lease payments 1,835  
Less current portion of finance lease obligations (99)  
Total long-term finance lease obligations $ 1,736 $ 1,198