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Other Long-Term Liabilities - Long Term Finance Lease Obligation (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Other Liabilities Disclosure [Abstract]    
Gross finance lease obligations $ 8,376  
Less imputed interest (1,323)  
Present value of net minimum lease payments 7,053  
Less current portion of finance lease obligations (411) $ (282)
Total long-term finance lease obligations $ 6,642 $ 4,745