Other Comprehensive Income / (Loss) (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Schedule of Changes in the AOCI Balance by Component

Changes in the AOCI balance by component are shown in the following table. Amounts reclassified in pension and other post-employment benefits to net earnings relate to the amortization of actuarial losses and are included in other income-net on the consolidated income statements. See Note 9. Employee Benefit Plans for further information. Interest rate derivatives consist of forward starting interest rate swaps classified as cash flow hedges. See Note 10, Debt and Credit Agreements for further information. Other primarily represents CSX's share of AOCI of equity method investees. Amounts reclassified in other to net earnings are included in materials, supplies, and other or equipment and other rents on the consolidated income statements.

	Pension and Other Post-Employment Benefits		Interest Rate Derivatives		Other		Accumulated Other Comprehensive Income (Loss)
(Dollars in millions)
Balance December 31, 2017 - Net of Tax	$	(440)	$	—	$	(46)	$	(486)
Other Comprehensive Income (Loss)
Reclassification of Stranded Tax Effects (a)	(108)		—		1		(107)
Loss Before Reclassifications	(111)		—		(8)		(119)
Amounts Reclassified to Net Earnings	38		—		(6)		32
Tax Benefit	17		—		2		19
Total Other Comprehensive Loss	(164)		—		(11)		(175)
Balance December 31, 2018 - Net of Tax	(604)		—		(57)		(661)
Other Comprehensive Income (Loss)
Loss Before Reclassifications	(43)		—		(5)		(48)
Amounts Reclassified to Net Earnings	23		—		8		31
Tax Benefit (Expense)	5		—		(2)		3
Total Other Comprehensive (Loss) Income	(15)		—		1		(14)
Balance December 31, 2019 - Net of Tax	(619)		—		(56)		(675)
Other Comprehensive Income (Loss)
(Loss) Income Before Reclassifications	(17)		80		(10)		53
Amounts Reclassified to Net Earnings	47		—		5		52
Tax Expense	(9)		(18)		(1)		(28)
Total Other Comprehensive Income (Loss)	21		62		(6)		77
Balance December 31, 2020 - Net of Tax	$	(598)	$	62	$	(62)	$	(598)

(a) As the result of a standard update adopted in 2018, certain tax effects stranded in accumulated other comprehensive income as a result of tax reform were reclassified to retained earnings.