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Investments and Variable Interest Entities - Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2025
USD ($)
May 31, 2025
Dec. 31, 2024
USD ($)
Schedule of Equity Method Investments [Line Items]                    
Unrealized gains (losses) recognized $ (55)   $ (15)   $ (85) $ (117)        
Cash distribution received from equity method investments         113 244        
Other investments 190       190         $ 184
Total carrying value of debt 99,100       99,100         99,100
Consolidated variable interest entity's assets included in condensed consolidated balance sheet 272,995       272,995         266,211
Short-Term Instruments                    
Schedule of Equity Method Investments [Line Items]                    
Other investments $ 0       0         0
Other Investments                    
Schedule of Equity Method Investments [Line Items]                    
Proceeds from short-term instruments         $ 0 632        
Purchase of short-term instruments           443        
Variable Interest Entity, Primary Beneficiary | Universal Beijing Resort                    
Schedule of Equity Method Investments [Line Items]                    
Ownership percentage in variable interest entity 30.00%       30.00%          
Total carrying value of debt $ 3,500       $ 3,500         3,400
Consolidated variable interest entity's assets included in condensed consolidated balance sheet 7,400       7,400         7,300
Consolidated variable interest entity's liabilities included in condensed consolidated balance sheet 7,200       7,200         7,000
Variable Interest Entity, Primary Beneficiary | Universal Beijing Resort | Universal Beijing Resort Term Loans                    
Schedule of Equity Method Investments [Line Items]                    
Total carrying value of debt 3,100       3,100         3,000
Atairos                    
Schedule of Equity Method Investments [Line Items]                    
Cash capital contributions for equity method investments         117 $ 60        
Equity method investments and certain retained distributions 5,000       5,000         $ 5,100
Atairos | Variable Interest Entity, Not Primary Beneficiary                    
Schedule of Equity Method Investments [Line Items]                    
Remaining unfunded capital commitment $ 1,300       $ 1,300          
Hulu                    
Schedule of Equity Method Investments [Line Items]                    
Equity method investment, ownership percentage 0.00%       0.00%       33.00%  
Proceeds from sale of equity method investments   $ 439   $ 9,200       $ 9,600    
Equity method investments, prior capital calls paid             $ 557      
Cash receivable related to receive portion of estimated future tax benefits from equity investment   $ 792                
Right to receive share of estimated future tax benefits from sale of equity method investment (as a percent)   0.50           0.50    
Pre-tax gain from sale of investment   $ 9,400