Insider Trading Arrangements	3 Months Ended	12 Months Ended
	Dec. 31, 2023 shares	Dec. 31, 2023 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Nathan D. Goldman [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On November 10, 2023, Nathan D. Goldman, Executive Vice President, Chief Legal Officer and Corporate Secretary, adopted a trading plan intended to satisfy Rule 10b5-1(c) to sell up to 83,000 shares of CSX common stock and 161,487 employee stock options to be exercised via same-day-sale on or after February 20, 2024, subject to certain conditions, to be in effect until November 8, 2024 unless otherwise terminated pursuant to the terms of the trading plan.
Name	Nathan D. Goldman
Title	Executive Vice President, Chief Legal Officer and Corporate Secretary
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	November 10, 2023
Arrangement Duration	364 days
Nathan D. Goldman Trading Arrangement, Common Stock [Member] | Nathan D. Goldman [Member]
Trading Arrangements, by Individual
Aggregate Available	83,000	83,000
Nathan D. Goldman Trading Arrangement, Employee Stock Options [Member] | Nathan D. Goldman [Member]
Trading Arrangements, by Individual
Aggregate Available	161,487	161,487