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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Related Party Transaction [Line Items]              
Cash distributions $ 1,100 $ 1,000 $ 1,400 $ 1,000 $ 2,100 $ 2,400  
Equity Method Investments and Joint Ventures [Abstract]              
Ownership Percentage in TTX Company 17.30%       17.30%    
Equity Method Investments Related to TTX $ 772       $ 772   $ 749
TTX Company              
Related Party Transaction [Line Items]              
Car Expenditures with TTX         205 199  
Parent Company              
Related Party Transaction [Line Items]              
Cash distributions         2,100 2,400  
Tax payments to Berkshire         747 562  
Tax refunds from Berkshire         1 $ 0  
Tax Payable, Berkshire $ 186       $ 186   $ 124