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Investments (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jul. 30, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]            
Income (loss) from unconsolidated investees     $ 75,000,000 $ (63,000,000)    
Gain related to observable price change   $ 2,000,000 34,000,000      
Gain on fair value adjustments     1,000,000      
Revolving Credit Facility            
Schedule of Equity Method Investments [Line Items]            
Maximum borrowing capacity $ 3,900,000,000   3,900,000,000      
Revolving Credit Facility | Line of Credit | Bakkt Credit Facility            
Schedule of Equity Method Investments [Line Items]            
Maximum borrowing capacity         $ 40,000,000  
Options Clearing Corporation            
Schedule of Equity Method Investments [Line Items]            
Income (loss) from unconsolidated investees $ 40,000,000 $ (18,000,000) $ 75,000,000 $ (63,000,000)    
Ownership percentage 40.00%   40.00%      
Bakkt            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage 32.00%   32.00%     54.00%
Fair value of investments $ 251,000,000   $ 251,000,000