Summarized Consolidating Financial Data - Consolidating Income Statements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Consolidated Income Statement
Revenue	$ 2,855	$ 3,013	[1]
Expense	1,677	1,794	[1]
Operating Income	1,178	1,219	[1]
Equity in Earnings of Subsidiaries	0	0	[1]
Interest (Expense) / Benefit	(187)	(178)	[1]
Other Income / (Expense) - Net	22	23	[1]
Earnings Before Income Taxes	1,013	1,064	[1]
Income Tax Benefit / (Expense)	(243)	(230)	[1]
Net Earnings	770	834	[1]
Total Comprehensive Earnings	773	836	[1]
Eliminations and Other
Consolidated Income Statement
Revenue	22	20
Expense	(38)	(37)
Operating Income	60	57
Equity in Earnings of Subsidiaries	(855)	(874)
Interest (Expense) / Benefit	39	49
Other Income / (Expense) - Net	(28)	(37)
Earnings Before Income Taxes	(784)	(805)
Income Tax Benefit / (Expense)	(15)	(16)
Net Earnings	(799)	(821)
Total Comprehensive Earnings	(800)	(819)
CSX Corporation
Consolidated Income Statement
Revenue	0	0
Expense	(99)	(137)
Operating Income	99	137
Equity in Earnings of Subsidiaries	855	874
Interest (Expense) / Benefit	(216)	(216)
Other Income / (Expense) - Net	5	8
Earnings Before Income Taxes	743	803
Income Tax Benefit / (Expense)	27	31
Net Earnings	770	834
Total Comprehensive Earnings	773	836
CSX Transportation
Consolidated Income Statement
Revenue	2,833	2,993
Expense	1,814	1,968
Operating Income	1,019	1,025
Equity in Earnings of Subsidiaries	0	0
Interest (Expense) / Benefit	(10)	(11)
Other Income / (Expense) - Net	45	52
Earnings Before Income Taxes	1,054	1,066
Income Tax Benefit / (Expense)	(255)	(245)
Net Earnings	799	821
Total Comprehensive Earnings	$ 800	$ 819

[1] Certain prior year data has been reclassified to conform to the current presentation.