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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
Total
USD ($)
Common Shares Outstanding
Common Stock and Other Capital
USD ($)
Retained Earnings
USD ($)
Accumulated Other Comprehensive Income (Loss)
USD ($)
Non-controlling Interest
USD ($)
Shareholders' Equity, beginning balance at Dec. 30, 2011 $ 8,598us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest   $ 1,055us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
$ 8,405us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (875)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
[1] $ 13us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Common Shares Outstanding, beginning balance at Dec. 30, 2011   1,049,157us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Accumulated other comprehensive loss, tax         496csx_PensionAndOtherPostretirementBenefitPlansAccumulatedOtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Comprehensive Earnings:            
Net Earnings 1,863us-gaap_NetIncomeLoss     1,863us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Other Comprehensive (Loss) Income (61)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent       (61)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
[1]  
Comprehensive Earnings 1,802us-gaap_ComprehensiveIncomeNetOfTax          
Common stock dividends (558)us-gaap_DividendsCommonStockCash     (558)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  0us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Share Repurchases (shares) (34,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares (34,088)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Share Repurchases (734)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue   (34)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
(700)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Bond Conversions (shares)   155us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Bond Conversions 1us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities   1us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
     
Stock Option Exercises and Other (shares)   5,261us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock Option Exercises and Other 27us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation   26us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  1us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Shareholders' Equity, ending balance at Dec. 28, 2012 9,136us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest   1,048us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
9,010us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(936)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
[1] 14us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Common Shares Outstanding, ending balance at Dec. 28, 2012   1,020,485us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Accumulated other comprehensive loss, tax         266csx_PensionAndOtherPostretirementBenefitPlansAccumulatedOtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Comprehensive Earnings:            
Net Earnings 1,864us-gaap_NetIncomeLoss     1,864us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Other Comprehensive (Loss) Income 413us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent       413us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
[1]  
Comprehensive Earnings 2,277us-gaap_ComprehensiveIncomeNetOfTax          
Common stock dividends (600)us-gaap_DividendsCommonStockCash     (600)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  0us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Share Repurchases (shares) (14,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares (13,791)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Share Repurchases (353)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue   (14)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
(339)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Bond Conversions (shares)   1us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Bond Conversions 0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities   0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
     
Stock Option Exercises and Other (shares)   2,165us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock Option Exercises and Other 44us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation   36us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
1us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  7us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Shareholders' Equity, ending balance at Dec. 27, 2013 10,504us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest   1,070us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
9,936us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(523)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
[1] 21us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Common Shares Outstanding, ending balance at Dec. 27, 2013   1,008,860us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Accumulated other comprehensive loss, tax         354csx_PensionAndOtherPostretirementBenefitPlansAccumulatedOtherComprehensiveIncomeLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Comprehensive Earnings:            
Net Earnings 1,927us-gaap_NetIncomeLoss     1,927us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Other Comprehensive (Loss) Income (143)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent       (143)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
[1]  
Comprehensive Earnings 1,784us-gaap_ComprehensiveIncomeNetOfTax          
Common stock dividends (629)us-gaap_DividendsCommonStockCash     (629)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  0us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Share Repurchases (shares) (17,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares (17,010)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Share Repurchases (517)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue   (17)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
(500)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Bond Conversions (shares)   134us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Bond Conversions 1us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities   1us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
     
Other (shares)   (393)us-gaap_StockholdersEquityOtherShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Other 33us-gaap_StockholdersEquityOther   30us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
0us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  3us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Shareholders' Equity, ending balance at Dec. 26, 2014 $ 11,176us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest   $ 1,084us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
$ 10,734us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (666)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
[1] $ 24us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Common Shares Outstanding, ending balance at Dec. 26, 2014   991,591us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
[1] Accumulated Other Comprehensive Loss year-end balances shown above are net of tax. The associated taxes were $496 million, $266 million and $354 million for 2012, 2013 and 2014, respectively. For additional information see Note 14, Other Comprehensive Income.