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Commitments and Contingencies BNSF Insurance Company (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Loss Contingencies [Line Items]    
Cash and cash equivalents $ 2,148 $ 1,938
BNSF Insurance Company | Commercial Paper, Bank Time Deposits, and Money Market Funds    
Loss Contingencies [Line Items]    
Cash and cash equivalents $ 561 $ 545