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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Related Party Transaction [Line Items]      
Cash distributions $ 700 $ 500  
Equity Method Investments and Joint Ventures [Abstract]      
Equity Method Investments Related to TTX $ 902   $ 891
TTX Company      
Related Party Transaction [Line Items]      
Ownership Percentage in TTX Company 17.40%    
TTX Company      
Related Party Transaction [Line Items]      
Car Hire Expenditures with TTX $ 106 97  
Parent Company      
Related Party Transaction [Line Items]      
Cash distributions 700 $ 500  
Tax payments to Berkshire 0    
Tax refunds from Berkshire 0    
Tax Payable, Berkshire $ 403    
Payable, Berkshire     $ 86