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Long-Term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Feb. 14, 2020
Nov. 30, 2020
Oct. 31, 2020
Jun. 30, 2020
May 31, 2020
Mar. 31, 2020
Feb. 29, 2020
Dec. 31, 2019
Aug. 31, 2019
May 31, 2019
Apr. 30, 2019
Feb. 28, 2019
Jan. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2022
Apr. 30, 2020
Debt Instrument [Line Items]                                    
Repayment and termination of existing revolving facility                           $ 846,815,000 $ 3,764,167,000 $ 2,265,000    
Loss on early retirement of debt               $ (171,000,000)           (126,462,000) (198,151,000) $ (3,619,000)    
Credit facility amount               11,271,706,000           12,480,586,000 11,271,706,000      
Fair value of interest rate swaps designated as cash flow hedges recorded as liability                           41,000,000        
Fair value of interest rate swaps designated as cash flow hedges recorded as current liability                           1,000,000        
Fair value of interest rate swaps designated as cash flow hedges recorded as long-term liability               28,000,000           40,000,000 28,000,000      
Fair value of interest rate swaps designated as cash flow hedges recorded as asset               7,000,000             7,000,000      
Fair value of interest rate swaps not designated as cash flow hedges recorded as liability                           78,000,000        
Fair value of interest rate swaps not designated as cash flow hedges recorded as current liability                           31,000,000        
Fair value of interest rate swaps not designated as cash flow hedges recorded as long-term liability               3,000,000           47,000,000 3,000,000      
Long-term debt, fair value               $ 12,100,000,000           13,200,000,000 $ 12,100,000,000      
Interest Rate Swap [Member]                                    
Debt Instrument [Line Items]                                    
Notional amount                           900,000,000        
Interest Rate Swap [Member] | Cash Flow Hedges [Member]                                    
Debt Instrument [Line Items]                                    
Notional amount                           $ 1,900,000,000        
Weighted Average fixed interest rate                           1.821%        
5.75% Operating Partnership senior notes, due 2027 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year                         2027 2027 2027      
Long-term debt, principal amount                         $ 750,000,000          
Long-term debt, interest rate (as a percent)               5.75%         5.75% 5.75% 5.75%      
4.75% senior notes, due 2028 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year     2028                     2028        
Long-term debt, principal amount     $ 750,000,000                              
Long-term debt, interest rate (as a percent)     4.75%                     4.75%        
6.75% Senior Notes, Due 2025 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year         2025                 2025        
Long-term debt, principal amount         $ 750,000,000                          
Long-term debt, interest rate (as a percent)         6.75%                 6.75%        
5.75% Senior Notes, Due 2025 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year           2025                        
Long-term debt, interest rate (as a percent)           5.75%                        
4.625% senior notes, due 2026 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year           2026               2026 2026      
Long-term debt, interest rate (as a percent)           4.625%   4.625%           4.625% 4.625%      
5.5% Senior Notes, Due 2027 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year           2027                        
Long-term debt, interest rate (as a percent)           5.50%                        
5.25% Senior Notes, Due 2020 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year               2020     2020              
Long-term debt, interest rate (as a percent)               5.25%     5.25%       5.25%      
Long-term debt, aggregate principal amount of debt purchased                     $ 233,000,000              
Redemption of senior notes               $ 267,000,000                    
6.75% Senior Notes, Due 2020 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year               2020     2020              
Long-term debt, interest rate (as a percent)               6.75%     6.75%       6.75%      
Long-term debt, aggregate principal amount of debt purchased                     $ 639,000,000              
Redemption of senior notes               $ 361,000,000                    
6.625% Senior Notes, Due 2021 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year               2021                    
Long-term debt, interest rate (as a percent)               6.625%             6.625%      
Redemption of senior notes               $ 1,250,000,000                    
5.5% Senior Notes, Due 2027 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year                     2027     2027 2027      
Long-term debt, principal amount                     $ 1,000,000,000.0              
Long-term debt, interest rate (as a percent)               5.50%     5.50%     5.50% 5.50%      
8.625% Senior Notes, Due 2019 [Member]                                    
Debt Instrument [Line Items]                                    
Repayment and termination of existing revolving facility                       $ 850,000,000            
Long-term debt, maturity year                       2019            
Long-term debt, interest rate (as a percent)                       8.625%            
3.875% Operating Partnership senior notes, due 2029 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year   2029                                
Long-term debt, principal amount   $ 750,000,000                                
Long-term debt, interest rate (as a percent)   3.875%                                
4.625% Operating Partnership senior notes, due 2025 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year       2025                   2025        
Long-term debt, principal amount       $ 800,000,000                            
Long-term debt, interest rate (as a percent)       4.625%                   4.625%        
5.25% MGM China senior notes, due 2025 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year       2025                   2025        
Long-term debt, principal amount       $ 500,000,000                            
Long-term debt, interest rate (as a percent)       5.25%                   5.25%        
5.375% MGM China Senior Notes, Due 2024 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year                   2024       2024 2024      
Long-term debt, principal amount                   $ 750,000,000                
Long-term debt, interest rate (as a percent)               5.375%   5.375%       5.375% 5.375%      
5.875% MGM China Senior Notes, Due 2026 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year                   2026       2026 2026      
Long-term debt, principal amount                   $ 750,000,000                
Long-term debt, interest rate (as a percent)               5.875%   5.875%       5.875% 5.875%      
Operating Partnership Senior Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Loss on early retirement of debt             $ (18,000,000)                      
Operating Partnership Senior Credit Facility [Member] | Term Loan B [Member]                                    
Debt Instrument [Line Items]                                    
Repayment of outstanding term loan facility             1,300,000,000                      
Operating Partnership Senior Credit Facility [Member] | Term Loan A [Member]                                    
Debt Instrument [Line Items]                                    
Repayment of outstanding term loan facility             $ 399,000,000                      
Senior Notes [Member]                                    
Debt Instrument [Line Items]                                    
Loss on early retirement of debt                           $ (105,000,000)        
Empire City [Member] | Bridge Facility [Member] | 5.75% Operating Partnership senior notes, due 2027 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, maturity year                           2027        
Long-term debt, principal amount                           $ 246,000,000        
Long-term debt, interest rate (as a percent)                           5.75%        
Maximum [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, aggregate principal amount of debt purchased           $ 750,000,000                        
Maximum [Member] | 5.75% Senior Notes, Due 2025 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, aggregate principal amount of debt purchased           325,000,000                        
Maximum [Member] | 4.625% senior notes, due 2026 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, aggregate principal amount of debt purchased           100,000,000                        
Maximum [Member] | 5.5% Senior Notes, Due 2027 [Member]                                    
Debt Instrument [Line Items]                                    
Long-term debt, aggregate principal amount of debt purchased           $ 325,000,000                        
Revolving Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Credit facility amount                           $ 1,350,000,000        
Revolving Credit Facility [Member] | Operating Partnership Senior Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Line of credit facility drawn                           $ 10,000,000        
Debt instrument, interest rate                           1.90%        
Long-term debt, maturity year                           2023        
Revolving Credit Facility [Member] | MGM China Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Variable interest rate base                 HIBOR”)                  
Revolving Credit Facility [Member] | HIBOR [Member] | MGM China Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Credit facility, maturity date                 2024-05                  
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member] | Operating Partnership Senior Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Interest rate margin (as a percent)                           1.75%        
Revolving Credit Facility [Member] | Minimum [Member] | HIBOR [Member] | MGM China Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Interest rate margin (as a percent)                 1.625%                  
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member] | Operating Partnership Senior Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Interest rate margin (as a percent)                           2.25%        
Revolving Credit Facility [Member] | Maximum [Member] | HIBOR [Member] | MGM China Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Interest rate margin (as a percent)                 2.75%                  
Unsecured Revolving Credit Facility [Member] | MGM China Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Line of credit facility                           $ 1,250,000,000        
Unsecured Revolving Credit Facility [Member] | MGM China Second Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Line of credit facility         $ 500,000,000                          
Line of credit facility drawn                           $ 0        
Line of credit facility, current borrowing capacity       $ 400,000,000 $ 300,000,000                          
Line of credit facility, increased amount of borrowing capacity       $ 100,000,000                            
Unsecured Revolving Credit Facility [Member] | Minimum [Member] | HIBOR [Member] | MGM China Second Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Interest rate margin (as a percent)                           1.625%        
Unsecured Revolving Credit Facility [Member] | Maximum [Member] | HIBOR [Member] | MGM China Second Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Interest rate margin (as a percent)                           2.75%        
Term Loan | MGM China Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Line of credit facility drawn                           $ 770,000,000        
Debt instrument, weighted average interest rate                           2.98%        
MGM China Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Credit facility amount               $ 667,404,000           $ 770,034,000 $ 667,404,000      
MGM China Credit Facility [Member] | Other Nonoperating Income (Expense) [Member]                                    
Debt Instrument [Line Items]                                    
Loss on early retirement of debt                   $ (16,000,000)                
Senior Credit Facility [Member] | Revolving Credit Facility [Member]                                    
Debt Instrument [Line Items]                                    
Line of credit facility                           1,500,000,000        
Line of credit facility drawn                           $ 0        
Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Forecast [Member]                                    
Debt Instrument [Line Items]                                    
Liquidity level including unrestricted cash, cash equivalents                                 $ 1,000,000,000.0  
Senior Credit Facility [Member] | Revolving Credit Facility [Member] | MGP BREIT Venture [Member]                                    
Debt Instrument [Line Items]                                    
Line of credit facility $ 1,500,000,000                                  
Credit facility, maturity date 2025-02                                  
Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]                                    
Debt Instrument [Line Items]                                    
Interest rate margin (as a percent)                           1.50%        
Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member]                                    
Debt Instrument [Line Items]                                    
Liquidity level including unrestricted cash, cash equivalents                                   $ 600,000,000
Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]                                    
Debt Instrument [Line Items]                                    
Interest rate margin (as a percent)                           2.25%        
Senior Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | MGP BREIT Venture [Member]                                    
Debt Instrument [Line Items]                                    
Repayment and termination of existing revolving facility $ 1,500,000,000                                  
Loss on early retirement of debt $ (4,000,000)