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Accounting Policies and Supplemental Disclosures - Acquisition Activity (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 17, 2022
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Business Acquisition [Line Items]            
Cash consideration   $ 6,341 $ 630 $ 7,696 $ 2,864  
Goodwill   $ 20,229   $ 20,229   $ 15,371
MGM Holdings Inc.            
Business Acquisition [Line Items]            
Cash consideration $ 6,100          
Debt assumed 2,500          
Video content acquired 3,400          
Goodwill $ 4,900