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Long-Term Debt (Schedule of 2.00% Convertible Senior Notes) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Total $ 3,578 $ 2,707
Unamortized deferred financing costs (39) (41)
Long-term portion less unamortized debt discount and deferred financing costs 3,253 2,654
MIC Corporate    
Total 988 388
Convertible Senior Notes Due October 2023    
Total 389 388
Convertible Senior Notes Due October 2023 | MIC Corporate    
Principal 403 403
Unamortized debt discount (14) (15)
Total 389 388
Unamortized deferred financing costs (6) (6)
Long-term portion less unamortized debt discount and deferred financing costs 383 382
Equity Component $ 27 $ 27