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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Current and long-term debt $ 2,707 $ 3,064
Current portion (12) (361)
Long-term portion 2,695 2,703
Unamortized deferred financing costs (41) (50)
Long-term portion less unamortized debt discount and deferred financing costs $ 2,654 2,653
Weighted average remaining life of deferred financing costs P5Y3M18D  
IMTT    
Debt Instrument [Line Items]    
Current and long-term debt $ 1,109 1,109
Atlantic Aviation    
Debt Instrument [Line Items]    
Current and long-term debt 1,015 1,025
MIC Hawaii    
Debt Instrument [Line Items]    
Current and long-term debt 195 196
MIC Corporate    
Debt Instrument [Line Items]    
Current and long-term debt $ 388 $ 734