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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Related Party Transaction [Line Items]                  
Cash distributions $ 1,500 $ 1,100 $ 1,000 $ 1,400 $ 1,400 $ 1,000 $ 3,600 $ 3,800  
Equity Method Investments and Joint Ventures [Abstract]                  
Equity Method Investments Related to TTX $ 793           $ 793   $ 749
TTX Company                  
Related Party Transaction [Line Items]                  
Ownership Percentage in TTX Company 17.30%           17.30%    
TTX Company                  
Related Party Transaction [Line Items]                  
Car Hire Expenditures with TTX             $ 311 295  
Parent Company                  
Related Party Transaction [Line Items]                  
Cash distributions             3,600 3,800  
Tax payments to Berkshire             1,200 927  
Tax refunds from Berkshire             1 $ 0  
Tax Receivable, Berkshire $ 2           $ 2    
Tax Payable, Berkshire                 $ 124