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Summarized Consolidating Financial Data - Consolidating Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Millions | Sep. 25, 2015 | Dec. 26, 2014 | Sep. 26, 2014 | Dec. 27, 2013
--- | --- | --- | --- | ---
Current Assets: |  |  |  |
Cash and Cash Equivalents | $ 541 | $ 669 | $ 479 | $ 592
Short-term Investments | 425 | 292 |  |
Accounts Receivable - Net | 1,003 | 1,129 |  |
Receivable from Affiliates | 0 | 0 |  |
Materials and Supplies | 309 | 273 |  |
Deferred Income Taxes | 137 | 141 |  |
Other Current Assets | 87 | 68 |  |
Total Current Assets | 2,502 | 2,572 |  |
Properties | 40,843 | 39,343 |  |
Accumulated Depreciation | (11,206) | (10,759) |  |
Properties - Net | 29,637 | 28,584 |  |
Other Long-term Assets | 500 | 541 |  |
Total Assets | 34,015 | 33,053 |  |
Current Liabilities: |  |  |  |
Accounts Payable | 842 | 845 |  |
Labor and Fringe Benefits Payable | 447 | 613 |  |
Payable to Affiliates | 0 | 0 |  |
Casualty, Environmental and Other Reserves | 146 | 142 |  |
Current Maturities of Long-term Debt | 18 | 228 |  |
Income and Other Taxes Payable | 282 | 163 |  |
Other Current Liabilities | 187 | 116 |  |
Total Current Liabilities | 1,922 | 2,107 |  |
Casualty, Environmental and Other Reserves | 270 | 276 |  |
Long-term Debt | 10,088 | 9,514 |  |
Deferred Income Taxes | 8,957 | 8,858 |  |
Other Long-term Liabilities | 1,118 | 1,122 |  |
Total Liabilities | 22,355 | 21,877 |  |
Shareholders' Equity |  |  |  |
Common Stock, $1 Par Value | 975 | 992 |  |
Other Capital | 120 | 92 |  |
Retained Earnings | 11,195 | 10,734 |  |
Accumulated Other Comprehensive Loss | (645) | (666) |  |
Noncontrolling Interest | 15 | 24 |  |
Total Shareholders' Equity | 11,660 | 11,176 |  |
Total Liabilities and Shareholders' Equity | $ 34,015 | $ 33,053 |  |
Common stock, par value (in dollars per share) | $ 1 | $ 1 |  |
Investments in Conrail |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | $ 793 | $ 779 |  |
Affiliates and Other Companies |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | 583 | 577 |  |
Investments in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | 0 | 0 |  |
CSX Corporation |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 311 | 510 | 295 | 439
Short-term Investments | 425 | 250 |  |
Accounts Receivable - Net | 2 | 2 |  |
Receivable from Affiliates | 1,224 | 1,211 |  |
Materials and Supplies | 0 | 0 |  |
Deferred Income Taxes | 10 | 3 |  |
Other Current Assets | 4 | 0 |  |
Total Current Assets | 1,976 | 1,976 |  |
Properties | 1 | 1 |  |
Accumulated Depreciation | (1) | (1) |  |
Properties - Net | 0 | 0 |  |
Other Long-term Assets | 173 | 178 |  |
Total Assets | 24,577 | 23,685 |  |
Current Liabilities: |  |  |  |
Accounts Payable | 145 | 106 |  |
Labor and Fringe Benefits Payable | 35 | 38 |  |
Payable to Affiliates | 3,184 | 3,053 |  |
Casualty, Environmental and Other Reserves | 0 | 0 |  |
Current Maturities of Long-term Debt | 0 | 200 |  |
Income and Other Taxes Payable | (320) | (150) |  |
Other Current Liabilities | 0 | 0 |  |
Total Current Liabilities | 3,044 | 3,247 |  |
Casualty, Environmental and Other Reserves | 0 | 0 |  |
Long-term Debt | 9,302 | 8,705 |  |
Deferred Income Taxes | (159) | (172) |  |
Other Long-term Liabilities | 745 | 753 |  |
Total Liabilities | 12,932 | 12,533 |  |
Shareholders' Equity |  |  |  |
Common Stock, $1 Par Value | 975 | 992 |  |
Other Capital | 120 | 92 |  |
Retained Earnings | 11,195 | 10,734 |  |
Accumulated Other Comprehensive Loss | (645) | (666) |  |
Noncontrolling Interest | 0 | 0 |  |
Total Shareholders' Equity | 11,645 | 11,152 |  |
Total Liabilities and Shareholders' Equity | 24,577 | 23,685 |  |
CSX Corporation | Investments in Conrail |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | 0 | 0 |  |
CSX Corporation | Affiliates and Other Companies |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | (39) | (39) |  |
CSX Corporation | Investments in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | 22,467 | 21,570 |  |
CSX Transportation |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 168 | 100 | 128 | 91
Short-term Investments | 0 | 0 |  |
Accounts Receivable - Net | 178 | 206 |  |
Receivable from Affiliates | 2,304 | 2,418 |  |
Materials and Supplies | 309 | 272 |  |
Deferred Income Taxes | 128 | 139 |  |
Other Current Assets | 70 | 61 |  |
Total Current Assets | 3,157 | 3,196 |  |
Properties | 38,278 | 36,888 |  |
Accumulated Depreciation | (9,861) | (9,516) |  |
Properties - Net | 28,417 | 27,372 |  |
Other Long-term Assets | 398 | 387 |  |
Total Assets | 32,622 | 31,599 |  |
Current Liabilities: |  |  |  |
Accounts Payable | 667 | 707 |  |
Labor and Fringe Benefits Payable | 374 | 511 |  |
Payable to Affiliates | 483 | 514 |  |
Casualty, Environmental and Other Reserves | 130 | 126 |  |
Current Maturities of Long-term Debt | 18 | 29 |  |
Income and Other Taxes Payable | 581 | 293 |  |
Other Current Liabilities | 185 | 111 |  |
Total Current Liabilities | 2,438 | 2,291 |  |
Casualty, Environmental and Other Reserves | 216 | 213 |  |
Long-term Debt | 786 | 809 |  |
Deferred Income Taxes | 8,901 | 8,827 |  |
Other Long-term Liabilities | 493 | 487 |  |
Total Liabilities | 12,834 | 12,627 |  |
Shareholders' Equity |  |  |  |
Common Stock, $1 Par Value | 181 | 181 |  |
Other Capital | 5,090 | 5,077 |  |
Retained Earnings | 14,532 | 13,717 |  |
Accumulated Other Comprehensive Loss | (34) | (31) |  |
Noncontrolling Interest | 19 | 28 |  |
Total Shareholders' Equity | 19,788 | 18,972 |  |
Total Liabilities and Shareholders' Equity | 32,622 | 31,599 |  |
CSX Transportation | Investments in Conrail |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | 0 | 0 |  |
CSX Transportation | Affiliates and Other Companies |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | 650 | 644 |  |
CSX Transportation | Investments in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | 0 | 0 |  |
Eliminations and Other |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 62 | 59 | $ 56 | $ 62
Short-term Investments | 0 | 42 |  |
Accounts Receivable - Net | 823 | 921 |  |
Receivable from Affiliates | (3,528) | (3,629) |  |
Materials and Supplies | 0 | 1 |  |
Deferred Income Taxes | (1) | (1) |  |
Other Current Assets | 13 | 7 |  |
Total Current Assets | (2,631) | (2,600) |  |
Properties | 2,564 | 2,454 |  |
Accumulated Depreciation | (1,344) | (1,242) |  |
Properties - Net | 1,220 | 1,212 |  |
Other Long-term Assets | (71) | (24) |  |
Total Assets | (23,184) | (22,231) |  |
Current Liabilities: |  |  |  |
Accounts Payable | 30 | 32 |  |
Labor and Fringe Benefits Payable | 38 | 64 |  |
Payable to Affiliates | (3,667) | (3,567) |  |
Casualty, Environmental and Other Reserves | 16 | 16 |  |
Current Maturities of Long-term Debt | 0 | (1) |  |
Income and Other Taxes Payable | 21 | 20 |  |
Other Current Liabilities | 2 | 5 |  |
Total Current Liabilities | (3,560) | (3,431) |  |
Casualty, Environmental and Other Reserves | 54 | 63 |  |
Long-term Debt | 0 | 0 |  |
Deferred Income Taxes | 215 | 203 |  |
Other Long-term Liabilities | (120) | (118) |  |
Total Liabilities | (3,411) | (3,283) |  |
Shareholders' Equity |  |  |  |
Common Stock, $1 Par Value | (181) | (181) |  |
Other Capital | (5,090) | (5,077) |  |
Retained Earnings | (14,532) | (13,717) |  |
Accumulated Other Comprehensive Loss | 34 | 31 |  |
Noncontrolling Interest | (4) | (4) |  |
Total Shareholders' Equity | (19,773) | (18,948) |  |
Total Liabilities and Shareholders' Equity | (23,184) | (22,231) |  |
Eliminations and Other | Investments in Conrail |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | 793 | 779 |  |
Eliminations and Other | Affiliates and Other Companies |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | (28) | (28) |  |
Eliminations and Other | Investments in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Consolidated Subsidiaries | $ (22,467) | $ (21,570) |  |

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