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Stock Plans and Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Pre-tax Expense and Income Tax Benefits Associated with Share-Based Compensation

Total pre-tax expense and income tax benefits associated with share-based compensation are shown in the table below. Income tax benefits include impacts from option exercises and the vesting of other equity awards.

			First Quarters
(Dollars in millions)			2021			2020
Share-Based Compensation Expense:
Performance Units			$	18		$	9
Stock Options			6			10
Restricted Stock Units and Awards			5			2
Stock Awards for Directors			2			2
Employee Stock Purchase Plan			1			1
Total Share-Based Compensation Expense			$	32		$	24
Income Tax Benefit			$	9		$	9

Schedule of Weighted Average Assumptions Used for Performance Units

The fair values of the performance units awarded during the quarters ended March 31, 2021 and March 31, 2020 were primarily calculated using a Monte-Carlo simulation model with the following weighted-average assumptions:

									Three Months
												2021			2020
Weighted-Average Assumptions Used:
Annual Dividend Yield												N/A			N/A
Risk-free Interest Rate												0.2		%	1.4		%
Annualized Volatility												33.6		%	24.5		%
Expected Life (in years)												2.9			2.9

Schedule of Fair Value Assumptions Used for Stock Options

The fair values of all stock option awards during the quarters ended March 31, 2021 and March 31, 2020 were estimated at the grant date with the following weighted average assumptions:

			First Quarters
			2021			2020
Weighted-Average Grant Date Fair Value			$	23.64		$	18.87
Weighted-Average Assumptions Used:
Annual Dividend Yield			1.2		%	1.2		%
Risk-Free Interest Rate			0.7		%	1.4		%
Annualized Volatility			31.2		%	26.0		%
Expected Life (in years)			6.0			6.0
Other Pricing Model Inputs:
Weighted-Average Grant Date Market Price of CSX Stock (strike price)			$	88.46		$	79.48

Schedule of Shares Issued Under Employee Stock Purchase Plan

During the quarters ended March 31, 2021 and March 31, 2020, the Company issued the following shares under this program:

			First Quarters
			2021			2020
Shares issued (in thousands)			132			122
Weighted average purchase price per share			$	58.00		$	61.51

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Schedule of Share-based Payment Award, Awards Other than Options, Valuation Assumptions [Table Text Block]

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of employee stock purchase plan activity.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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