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Long-Term Debt - Additional Information (Detail) - USD ($)
1 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Sep. 27, 2021
Feb. 28, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
Credit facility amount   $ 12,715,126,000     $ 12,480,586,000
Fair value of interest rate swaps designated as cash flow hedges recorded as liability   31,000,000     41,000,000
Fair value of interest rate swaps designated as cash flow hedges recorded as current liability   4,000,000     1,000,000
Fair value of interest rate swaps designated as cash flow hedges recorded as long-term liability   27,000,000     40,000,000
Fair value of interest rate swaps not designated as cash flow hedges recorded as liability   33,000,000     78,000,000
Fair value of interest rate swaps not designated as cash flow hedges recorded as current liability   11,000,000     31,000,000
Fair value of interest rate swaps not designated as cash flow hedges recorded as long-term liability   22,000,000     47,000,000
Long-term debt, fair value   $ 13,400,000,000     $ 13,200,000,000
City Center Holdings L L C          
Debt Instrument [Line Items]          
Long term debt assumed in acquisition     $ 1,729,451,000    
4.75% MGM China senior notes, due 2027          
Debt Instrument [Line Items]          
Long-term debt, principal amount $ 750,000,000        
Long-term debt, interest rate (as a percent) 4.75% 4.75%      
Long term debt, issued price percentage 99.97%        
Operating Partnership Senior Credit Facility | Interest Rate Swap          
Debt Instrument [Line Items]          
Notional amount   $ 900,000,000      
Operating Partnership Senior Credit Facility | Interest Rate Swap | Cash Flow Hedges          
Debt Instrument [Line Items]          
Weighted average fixed interest rate   1.783%      
Notional amount   $ 700,000,000      
Revolving Credit Facility | Operating Partnership Senior Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility drawn   0      
Credit facility amount   1,350,000,000      
Unsecured Revolving Credit Facility | MGM China First Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility capacity   1,250,000,000      
Unsecured Revolving Credit Facility | MGM China Second Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility capacity   500,000,000      
Line of credit facility drawn   0      
Line of credit facility, current borrowing capacity   400,000,000      
Term Loan | MGM China First Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility drawn   $ 265,000,000      
Debt instrument, weighted average interest rate   2.81%      
Senior Credit Facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility capacity   $ 1,500,000,000      
Line of credit facility drawn   $ 0      
Minimum liquidity level (not less than)       $ 1,000,000,000