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Commitments and Contingencies Insurance (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Loss Contingencies [Line Items]    
Cash and cash equivalents $ 2,972 $ 1,938
Commercial Paper, Bank Time Deposits, and Money Market Funds | BNSF Insurance Company    
Loss Contingencies [Line Items]    
Cash and cash equivalents $ 555 $ 545