Debt	6 Months Ended
Debt	Jun. 30, 2025
Debt Disclosure [Abstract]
Debt	Debt Notes and Debentures In May 2025, the Registrant filed a new automatic shelf registration statement with the Securities and Exchange Commission (SEC) that became effective on May 5, 2025, and will remain effective for three years. In June 2025, the Registrant issued $900 million of 5.800 percent debentures due March 15, 2056. The net proceeds from the sale of the debentures will be used for general corporate purposes, which may include but are not limited to working capital, capital expenditures, repayment of outstanding indebtedness, and distributions. As of June 30, 2025, $750 million remained authorized by the Board of Directors to be issued through the debt shelf offering process. The Registrant is required to maintain certain financial covenants in conjunction with $500 million of certain issued and outstanding junior subordinated notes. As of June 30, 2025, the Registrant was in compliance with these financial covenants. Fair Value of Debt Instruments As of June 30, 2025 and December 31, 2024, the fair value of BNSF’s debt, excluding finance leases, was $21.8 billion and $21.1 billion, respectively, while the book value, which also excludes finance leases, was $23.8 billion and $23.4 billion, respectively. The fair value of BNSF’s debt is primarily based on market value price models using observable market-based data for the same or similar issues, or on the estimated rates that would be offered to BNSF for debt of the same remaining maturities (Level 2 inputs).

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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