Stock Plans and Share-Based Compensation (Long-term Incentive Plans) (Details) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | |||||||||||||||||||||||
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Dec. 30, 2011
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Dec. 31, 2010
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Dec. 25, 2009
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Dec. 30, 2011
Long-term Incentive Plans [Member]
years
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Dec. 31, 2010
Long-term Incentive Plans [Member]
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Dec. 25, 2009
Long-term Incentive Plans [Member]
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Jan. 31, 2012
Long-term Incentive Plans [Member]
Issuance of Equity [Member]
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Dec. 30, 2011
Long-term Incentive Plans [Member]
Performance Units [Member]
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Dec. 30, 2011
Long-term Incentive Plans [Member]
Restricted Stock Units (RSUs) [Member]
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Dec. 31, 2010
Long-term Incentive Plans [Member]
Restricted Stock Units (RSUs) [Member]
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Dec. 25, 2009
Long-term Incentive Plans [Member]
Restricted Stock Units (RSUs) [Member]
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Dec. 30, 2011
Long Term Incentive Plan Year One [Member]
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Dec. 31, 2010
Long Term Incentive Plan Year One [Member]
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Dec. 30, 2011
Long Term Incentive Plan Year One [Member]
Restricted Stock Units (RSUs) [Member]
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Dec. 30, 2011
Long Term Incentive Plan Year One [Member]
Restricted Stock Units (RSUs) [Member]
Minimum [Member]
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May 31, 2011
Long Term Incentive Plan Year One [Member]
Restricted Stock Units (RSUs) [Member]
Maximum [Member]
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Dec. 30, 2011
Long Term Incentive Plan Year Two [Member]
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Dec. 31, 2010
Long Term Incentive Plan Year Two [Member]
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Dec. 30, 2011
Long Term Incentive Plan Year Two [Member]
Restricted Stock Units (RSUs) [Member]
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Dec. 30, 2011
Long Term Incentive Plan Year Two [Member]
Restricted Stock Units (RSUs) [Member]
Minimum [Member]
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May 31, 2011
Long Term Incentive Plan Year Two [Member]
Restricted Stock Units (RSUs) [Member]
Maximum [Member]
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Dec. 30, 2011
Long Term Incentive Plan Year Three [Member]
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Dec. 31, 2010
Long Term Incentive Plan Year Three [Member]
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Dec. 30, 2011
Long Term Incentive Plan Year Three [Member]
Restricted Stock Units (RSUs) [Member]
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Dec. 30, 2011
Long Term Incentive Plan Year Three [Member]
Restricted Stock Units (RSUs) [Member]
Minimum [Member]
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May 31, 2011
Long Term Incentive Plan Year Three [Member]
Restricted Stock Units (RSUs) [Member]
Maximum [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||||||||
Performance unit equivalent of CSX stock, in shares | 1 | ||||||||||||||||||||||||||||||
Percentage of payout subject to reduction | (30.00%) | ||||||||||||||||||||||||||||||
Total expense incurred due to long-term incentive plans | $ 30,000,000 | $ 62,000,000 | $ 17,000,000 | $ 21,000,000 | $ 56,000,000 | $ 13,000,000 | |||||||||||||||||||||||||
Shares issued subsequent to year end as a result of achieving performance targets under the long-term incentive plan (in shares) | 2,700,000 | ||||||||||||||||||||||||||||||
Time Based Restricted Stock Unit Granted To Key Member Of Management | 361,000 | 402,000 | 658,000 | 25,000 | 158,000 | 41,000 | 1,235,000 | 402,000 | 1,111,000 | 0 | 361,000 | ||||||||||||||||||||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] | |||||||||||||||||||||||||||||||
Number of target units outstanding | 1,966,000 | [1] | 1,224,000 | [1] | 1,097,000 | [1] | |||||||||||||||||||||||||
Weighted-average fair value at grant date | $ 24.69 | $ 16.89 | $ 11.09 | [1] | $ 18.14 | [1] | $ 25.92 | [1] | |||||||||||||||||||||||
Payout Range | 0.00% | 233.00% | 0.00% | 200.00% | 0.00% | 200.00% | |||||||||||||||||||||||||
Unrecognized compensation cost | $ 17,000,000 | ||||||||||||||||||||||||||||||
Expected weighted average period of recognition for unrecognized compensation cost (in years) | 1.5 | ||||||||||||||||||||||||||||||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | |||||||||||||||||||||||||||||||
Unvested, Units Outstanding, beginning balance | 1,942,000 | 1,788,000 | 1,183,000 | 0 | 0 | 0 | |||||||||||||||||||||||||
Unvested, Weighted-Average Fair Value at Grant Date, beginning balance | $ 14.43 | $ 10.50 | |||||||||||||||||||||||||||||
Granted, Units Outstanding | 361,000 | 402,000 | 658,000 | 25,000 | 158,000 | 41,000 | 1,235,000 | 402,000 | 1,111,000 | 0 | 361,000 | ||||||||||||||||||||
Granted, Weighted-Average Fair Value at Grant Date | $ 24.69 | $ 16.89 | $ 11.09 | [1] | $ 18.14 | [1] | $ 25.92 | [1] | |||||||||||||||||||||||
Forfeited, Units Outstanding | 0 | (4,000) | 0 | (52,000) | (14,000) | 0 | |||||||||||||||||||||||||
Forfeited, Weighted-Average Fair Value at Grant Date | $ 23.93 | $ 17.31 | |||||||||||||||||||||||||||||
Vested, Units Outstanding | 1,966,000 | 0 | 0 | ||||||||||||||||||||||||||||
Vested, Weighted-Average Fair Value at Grant Date | $ 11.09 | ||||||||||||||||||||||||||||||
Unvested, Units Outstanding, ending balance | 0 | 1,942,000 | 1,224,000 | 1,183,000 | 1,097,000 | 0 | |||||||||||||||||||||||||
Unvested, Weighted-Average Fair Value at Grant Date, ending balance | $ 22.03 | $ 14.43 | $ 10.50 | ||||||||||||||||||||||||||||
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