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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Related Party Transaction [Line Items]      
Cash distributions $ 500 $ 0  
Equity Method Investments and Joint Ventures [Abstract]      
Equity Method Investments Related to TTX $ 860   $ 848
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 $ 97 89  
Parent Company      
Related Party Transaction [Line Items]      
Cash distributions 500 0  
Tax payments to Berkshire 0 1  
Tax refunds from Berkshire 0 $ 0  
Tax Payable, Berkshire $ 436    
Payable, Berkshire     $ 170