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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Related Party Transaction [Line Items]                
Cash distributions   $ 1,100 $ 1,500 $ 1,100 $ 1,000 $ 1,100 $ 3,600  
Equity Method Investments and Joint Ventures [Abstract]                
Equity Method Investments Related to TTX $ 837         $ 837   $ 807
TTX Company                
Related Party Transaction [Line Items]                
Ownership Percentage in TTX Company 17.40%         17.40%    
TTX Company                
Related Party Transaction [Line Items]                
Car Hire Expenditures with TTX $ 92   $ 106     $ 277 311  
Parent Company                
Related Party Transaction [Line Items]                
Cash distributions           1,100 3,600  
Tax payments to Berkshire           961 1,200  
Tax refunds from Berkshire           0 $ 1  
Tax Receivable, Berkshire $ 104         $ 104    
Tax Payable, Berkshire               $ 112