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Summarized Consolidating Financial Data - Consolidating Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Millions | Sep. 30, 2017 | Dec. 30, 2016 | Sep. 23, 2016 | Dec. 25, 2015
--- | --- | --- | --- | ---
Current Assets: |  |  |  |
Cash and Cash Equivalents | $ 591 | $ 603 | $ 603 | $ 628
Short-term Investments | 113 | 417 |  |
Accounts Receivable - Net | 981 | 938 |  |
Receivable from Affiliates | 0 | 0 |  |
Materials and Supplies | 392 | 407 |  |
Other Current Assets | 95 | 122 |  |
Total Current Assets | 2,172 | 2,487 |  |
Properties | 44,105 | 43,227 |  |
Accumulated Depreciation | (12,526) | (12,077) |  |
Properties - Net | 31,579 | 31,150 |  |
Other Long-term Assets | 316 | 318 |  |
Total Assets | 35,573 | 35,414 |  |
Current Liabilities: |  |  |  |
Accounts Payable | 905 | 806 |  |
Labor and Fringe Benefits Payable | 601 | 545 |  |
Payable to Affiliates | 0 | 0 |  |
Casualty, Environmental and Other Reserves | 122 | 115 |  |
Current Maturities of Long-term Debt | 19 | 331 |  |
Income and Other Taxes Payable | 322 | 129 |  |
Other Current Liabilities | 106 | 114 |  |
Total Current Liabilities | 2,075 | 2,040 |  |
Casualty, Environmental and Other Reserves | 253 | 259 |  |
Long-term Debt | 11,788 | 10,962 |  |
Deferred Income Taxes - Net | 9,789 | 9,596 |  |
Other Long-term Liabilities | 766 | 863 |  |
Total Liabilities | 24,671 | 23,720 |  |
Shareholders' Equity |  |  |  |
Common Stock, $1 Par Value | 894 | 928 |  |
Other Capital | 227 | 138 |  |
Retained Earnings | 10,327 | 11,253 |  |
Accumulated Other Comprehensive Loss | (561) | (640) |  |
Noncontrolling Interest | 15 | 15 |  |
Total Shareholders' Equity | 10,902 | 11,694 |  |
Total Liabilities and Shareholders' Equity | $ 35,573 | $ 35,414 |  |
Common stock, par value (in dollars per share) | $ 1 | $ 1 |  |
Investments in Conrail |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | $ 864 | $ 840 |  |
Affiliates and Other Companies |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 642 | 619 |  |
Investments in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 0 | 0 |  |
Eliminations and Other |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 11 | 17 | 25 | 9
Short-term Investments | 13 | 2 |  |
Accounts Receivable - Net | 705 | 721 |  |
Receivable from Affiliates | (4,016) | (3,508) |  |
Materials and Supplies | 0 | 0 |  |
Other Current Assets | 17 | 16 |  |
Total Current Assets | (3,270) | (2,752) |  |
Properties | 2,812 | 2,708 |  |
Accumulated Depreciation | (1,511) | (1,442) |  |
Properties - Net | 1,301 | 1,266 |  |
Other Long-term Assets | (285) | (291) |  |
Total Assets | (26,597) | (25,101) |  |
Current Liabilities: |  |  |  |
Accounts Payable | 32 | 33 |  |
Labor and Fringe Benefits Payable | 42 | 65 |  |
Payable to Affiliates | (4,530) | (3,957) |  |
Casualty, Environmental and Other Reserves | 13 | 13 |  |
Current Maturities of Long-term Debt | 0 | (1) |  |
Income and Other Taxes Payable | 19 | 16 |  |
Other Current Liabilities | 3 | 2 |  |
Total Current Liabilities | (4,421) | (3,829) |  |
Casualty, Environmental and Other Reserves | 46 | 51 |  |
Long-term Debt | 0 | 0 |  |
Deferred Income Taxes - Net | 290 | 258 |  |
Other Long-term Liabilities | (317) | (330) |  |
Total Liabilities | (4,402) | (3,850) |  |
Shareholders' Equity |  |  |  |
Common Stock, $1 Par Value | (181) | (181) |  |
Other Capital | (5,096) | (5,095) |  |
Retained Earnings | (16,938) | (15,994) |  |
Accumulated Other Comprehensive Loss | 20 | 19 |  |
Noncontrolling Interest | 0 | 0 |  |
Total Shareholders' Equity | (22,195) | (21,251) |  |
Total Liabilities and Shareholders' Equity | (26,597) | (25,101) |  |
Eliminations and Other | Investments in Conrail |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 864 | 840 |  |
Eliminations and Other | Affiliates and Other Companies |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 14 | 15 |  |
Eliminations and Other | Investments in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | (25,221) | (24,179) |  |
CSX Corporation |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 433 | 305 | 448 | 444
Short-term Investments | 100 | 415 |  |
Accounts Receivable - Net | (1) | 2 |  |
Receivable from Affiliates | 1,012 | 1,157 |  |
Materials and Supplies | 0 | 0 |  |
Other Current Assets | 2 | 0 |  |
Total Current Assets | 1,546 | 1,879 |  |
Properties | 1 | 1 |  |
Accumulated Depreciation | (1) | (1) |  |
Properties - Net | 0 | 0 |  |
Other Long-term Assets | 9 | 2 |  |
Total Assets | 26,737 | 26,021 |  |
Current Liabilities: |  |  |  |
Accounts Payable | 178 | 95 |  |
Labor and Fringe Benefits Payable | 76 | 40 |  |
Payable to Affiliates | 4,148 | 3,457 |  |
Casualty, Environmental and Other Reserves | 0 | 0 |  |
Current Maturities of Long-term Debt | 0 | 313 |  |
Income and Other Taxes Payable | (115) | (346) |  |
Other Current Liabilities | 0 | 0 |  |
Total Current Liabilities | 4,287 | 3,559 |  |
Casualty, Environmental and Other Reserves | 0 | 0 |  |
Long-term Debt | 11,053 | 10,203 |  |
Deferred Income Taxes - Net | (198) | (203) |  |
Other Long-term Liabilities | 708 | 783 |  |
Total Liabilities | 15,850 | 14,342 |  |
Shareholders' Equity |  |  |  |
Common Stock, $1 Par Value | 894 | 928 |  |
Other Capital | 227 | 138 |  |
Retained Earnings | 10,327 | 11,253 |  |
Accumulated Other Comprehensive Loss | (561) | (640) |  |
Noncontrolling Interest | 0 | 0 |  |
Total Shareholders' Equity | 10,887 | 11,679 |  |
Total Liabilities and Shareholders' Equity | 26,737 | 26,021 |  |
CSX Corporation | Investments in Conrail |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 0 | 0 |  |
CSX Corporation | Affiliates and Other Companies |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | (39) | (39) |  |
CSX Corporation | Investments in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 25,221 | 24,179 |  |
CSX Transportation |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 147 | 281 | $ 130 | $ 175
Short-term Investments | 0 | 0 |  |
Accounts Receivable - Net | 277 | 215 |  |
Receivable from Affiliates | 3,004 | 2,351 |  |
Materials and Supplies | 392 | 407 |  |
Other Current Assets | 76 | 106 |  |
Total Current Assets | 3,896 | 3,360 |  |
Properties | 41,292 | 40,518 |  |
Accumulated Depreciation | (11,014) | (10,634) |  |
Properties - Net | 30,278 | 29,884 |  |
Other Long-term Assets | 592 | 607 |  |
Total Assets | 35,433 | 34,494 |  |
Current Liabilities: |  |  |  |
Accounts Payable | 695 | 678 |  |
Labor and Fringe Benefits Payable | 483 | 440 |  |
Payable to Affiliates | 382 | 500 |  |
Casualty, Environmental and Other Reserves | 109 | 102 |  |
Current Maturities of Long-term Debt | 19 | 19 |  |
Income and Other Taxes Payable | 418 | 459 |  |
Other Current Liabilities | 103 | 112 |  |
Total Current Liabilities | 2,209 | 2,310 |  |
Casualty, Environmental and Other Reserves | 207 | 208 |  |
Long-term Debt | 735 | 759 |  |
Deferred Income Taxes - Net | 9,697 | 9,541 |  |
Other Long-term Liabilities | 375 | 410 |  |
Total Liabilities | 13,223 | 13,228 |  |
Shareholders' Equity |  |  |  |
Common Stock, $1 Par Value | 181 | 181 |  |
Other Capital | 5,096 | 5,095 |  |
Retained Earnings | 16,938 | 15,994 |  |
Accumulated Other Comprehensive Loss | (20) | (19) |  |
Noncontrolling Interest | 15 | 15 |  |
Total Shareholders' Equity | 22,210 | 21,266 |  |
Total Liabilities and Shareholders' Equity | 35,433 | 34,494 |  |
CSX Transportation | Investments in Conrail |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 0 | 0 |  |
CSX Transportation | Affiliates and Other Companies |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 667 | 643 |  |
CSX Transportation | Investments in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | $ 0 | $ 0 |  |

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