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Long-Term Debt (Schedule of 2.00% Convertible Senior Notes) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Total $ 2,708 $ 3,064
Unamortized deferred financing costs (43) (50)
MIC Corporate    
Total 387 734
Convertible Senior Notes Due October 2023    
Principal 387 384
Convertible Senior Notes Due October 2023 | MIC Corporate    
Principal 403 403
Unamortized debt discount (16) (19)
Total 387 384
Unamortized deferred financing costs (6) (7)
Long-term portion less unamortized debt discount and deferred financing costs 381 377
Equity Component $ 27 $ 27