Commitments and Contingencies Insurance (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Loss Contingencies [Line Items]
Cash and cash equivalents	$ 1,995	$ 2,004
Commercial Paper, Bank Time Deposits, and Money Market Funds \| BNSF Insurance Company
Loss Contingencies [Line Items]
Cash and cash equivalents	$ 579	$ 562

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details