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Long-Term Debt (Schedule of 2.00% Convertible Senior Notes Due October 2023) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Current and long-term debt $ 2,707 $ 3,064
Unamortized deferred financing costs (41) (50)
Long-term portion less unamortized debt discount and deferred financing costs 2,654 2,653
MIC Corporate    
Current and long-term debt 388 734
MIC Corporate | 2.00% Convertible Senior Notes due October 2023    
Principal 403 403
Unamortized debt discount (15) (19)
Current and long-term debt 388 384
Unamortized deferred financing costs (6) (7)
Long-term portion less unamortized debt discount and deferred financing costs 382 377
Equity Component $ 27 $ 27