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Equity Method Investments - Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Apr. 21, 2023
USD ($)
Dec. 31, 2023
USD ($)
seat
Mar. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
seat
Dec. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]                
Number of seats held on the board of directors | seat   2     2      
Impairment of equity method investment       $ 0 $ 0 $ 182    
Proceeds from sale of equity method investments       17 721 0    
Revaluation of MLU B.V. call option       $ 0 0 191    
Call Option                
Schedule of Equity Method Investments [Line Items]                
Initial fair value             $ 230  
Careem Technologies                
Schedule of Equity Method Investments [Line Items]                
Investment trading   $ 400     $ 400      
Gain (loss) on other income (expense)   $ 204            
Equity ownership interest (as a percent)   42.00%     42.00%      
Initial carrying value   $ 300     $ 300      
MLU B.V.                
Schedule of Equity Method Investments [Line Items]                
Equity ownership interest (as a percent) 29.00%             38.00%
Impairment of equity method investment     $ 182          
Proceeds from sale of equity method investments $ 703              
MLU B.V. | Call Option                
Schedule of Equity Method Investments [Line Items]                
Initial fair value           2    
Revaluation of MLU B.V. call option           $ 191    
MLU B.V. | Call Option | Expected Term                
Schedule of Equity Method Investments [Line Items]                
Call option term           0.7    
MLU B.V. | Call Option | Option Volatility                
Schedule of Equity Method Investments [Line Items]                
Call option term           0.65