XML 22 R28.htm IDEA: XBRL DOCUMENT v2.4.1.9
Nature of Operations and Significant Accounting Policies - Other Items and Share Repurchases (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 27, 2015
Mar. 28, 2014
Apr. 14, 2015
Apr. 30, 2013
Subsequent Event [Line Items]        
Dividend per common share (in dollars per share) $ 0.16us-gaap_CommonStockDividendsPerShareDeclared $ 0.15us-gaap_CommonStockDividendsPerShareDeclared    
Share repurchase program       $ 1,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Shares repurchased 127,000,000us-gaap_PaymentsForRepurchaseOfCommonStock 127,000,000us-gaap_PaymentsForRepurchaseOfCommonStock    
Shares repurchased during the period (in shares) 4,000,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares 5,000,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares    
Subsequent Event        
Subsequent Event [Line Items]        
Increase in quarterly dividend (in dollars per share)     13.00%csx_QuarterlyDividendRateIncreaseDecrease
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Dividend per common share (in dollars per share)     $ 0.18us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Share repurchase program     $ 2,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Share repurchase program, period in force     24 months