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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
May 31, 2019
Apr. 30, 2019
Jan. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Feb. 28, 2019
8.625% senior notes, due 2019 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount         $ 850.0  
Long-term debt, interest rate (as a percent)         8.625% 8.625%
Long-term debt, maturity year         2019  
5.25% senior notes, due 2020 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 500.0 $ 500.0  
Long-term debt, interest rate (as a percent)   5.25%   5.25% 5.25%  
Long-term debt, maturity year   2020   2020 2020  
6.75% senior notes, due 2020 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 1,000.0 $ 1,000.0  
Long-term debt, interest rate (as a percent)   6.75%   6.75% 6.75%  
Long-term debt, maturity year   2020   2020 2020  
6.625% senior notes, due 2021 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 1,250.0 $ 1,250.0  
Long-term debt, interest rate (as a percent)       6.625% 6.625%  
Long-term debt, maturity year       2021 2021  
7.75% senior notes, due 2022 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 1,000.0 $ 1,000.0  
Long-term debt, interest rate (as a percent)       7.75% 7.75%  
Long-term debt, maturity year       2022 2022  
6% senior notes, due 2023 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 1,250.0 $ 1,250.0  
Long-term debt, interest rate (as a percent)       6.00% 6.00%  
Long-term debt, maturity year       2023 2023  
5.625% Operating Partnership senior notes, due 2024 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 1,050.0 $ 1,050.0  
Long-term debt, interest rate (as a percent)       5.625% 5.625%  
Long-term debt, maturity year       2024 2024  
5.375% MGM China senior notes, due 2024 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount $ 750.0     $ 750.0    
Long-term debt, interest rate (as a percent) 5.375%     5.375%    
Long-term debt, maturity year 2024     2024    
5.75% senior notes, due 2025 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 1,000.0    
Long-term debt, interest rate (as a percent)       5.75%    
Long-term debt, maturity year       2025    
5.875% MGM China senior notes, due 2026 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount $ 750.0     $ 750.0    
Long-term debt, interest rate (as a percent) 5.875%     5.875%    
Long-term debt, maturity year 2026     2026    
4.5% Operating Partnership senior notes, due 2026 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 500.0 $ 500.0  
Long-term debt, interest rate (as a percent)       4.50% 4.50%  
Long-term debt, maturity year       2026 2026  
4.625% senior notes, due 2026 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 500.0 $ 500.0  
Long-term debt, interest rate (as a percent)       4.625% 4.625%  
Long-term debt, maturity year       2026 2026  
5.75% Operating Partnership senior notes, due 2027 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount     $ 750.0 $ 750.0    
Long-term debt, interest rate (as a percent)     5.75% 5.75%    
Long-term debt, maturity year     2027 2027    
5.5% senior notes, due 2027 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 1,000.0    
Long-term debt, interest rate (as a percent)       5.50%    
Long-term debt, maturity year       2027    
4.50% MGM Growth Properties senior notes, due 2028 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 350.0 $ 350.0  
Long-term debt, interest rate (as a percent)       4.50% 4.50%  
Long-term debt, maturity year       2028 2028  
7% debentures, due 2036 [Member]            
Debt Instrument [Line Items]            
Long-term debt, principal amount       $ 0.6 $ 0.6  
Long-term debt, interest rate (as a percent)       7.00% 7.00%  
Long-term debt, maturity year       2036 2036