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CONSOLIDATED COMPREHENSIVE INCOME STATEMENTS (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 26, 2014
Sep. 26, 2014
Jun. 27, 2014
Mar. 28, 2014
Dec. 27, 2013
Sep. 27, 2013
Jun. 28, 2013
Mar. 29, 2013
Dec. 26, 2014
Dec. 27, 2013
Dec. 28, 2012
Net Earnings $ 491us-gaap_NetIncomeLoss $ 509us-gaap_NetIncomeLoss $ 529us-gaap_NetIncomeLoss $ 398us-gaap_NetIncomeLoss $ 426us-gaap_NetIncomeLoss $ 455us-gaap_NetIncomeLoss $ 521us-gaap_NetIncomeLoss $ 462us-gaap_NetIncomeLoss $ 1,927us-gaap_NetIncomeLoss $ 1,864us-gaap_NetIncomeLoss $ 1,863us-gaap_NetIncomeLoss
Other Comprehensive (Loss) Income, Net of Tax                 (143)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 413us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (61)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive Earnings                 1,784us-gaap_ComprehensiveIncomeNetOfTax 2,277us-gaap_ComprehensiveIncomeNetOfTax 1,802us-gaap_ComprehensiveIncomeNetOfTax
Pension and Other Post-Employment Benefits                      
Other Comprehensive (Loss) Income, Net of Tax                 (149)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
389us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
(52)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Other                      
Other Comprehensive (Loss) Income, Net of Tax                 $ 6us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= csx_AccumulatedOtherAdjustmentsMember
$ 24us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= csx_AccumulatedOtherAdjustmentsMember
$ (9)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= csx_AccumulatedOtherAdjustmentsMember