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Summarized Consolidating Financial Data (Consolidating Balance Sheets) (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 30, 2016
--- | --- | --- | --- | ---
Current Assets: |  |  |  |
Cash and Cash Equivalents | $ 958 | $ 858 | $ 401 | $ 603
Short-term Investments | 996 | 253 |  |
Accounts Receivable - Net | 986 | 1,010 |  |
Receivable from Affiliates | 0 | 0 |  |
Materials and Supplies | 261 | 263 |  |
Other Current Assets | 77 | 181 |  |
Total Current Assets | 3,278 | 2,565 |  |
Properties | 45,100 | 44,805 |  |
Accumulated Depreciation | (12,932) | (12,807) |  |
Properties - Net (Note 6) | 32,168 | 31,998 |  |
Right of Use Lease Asset (Note 7) | 532 | 0 |  |
Other Long-term Assets | 400 | 387 |  |
Total Assets | 38,257 | 36,729 |  |
Current Liabilities: |  |  |  |
Accounts Payable | 1,043 | 949 |  |
Labor and Fringe Benefits Payable | 489 | 550 |  |
Payable to Affiliates | 0 | 0 |  |
Casualty, Environmental and Other Reserves | 100 | 113 |  |
Current Maturities of Long-term Debt | 245 | 18 |  |
Income and Other Taxes Payable | 69 | 106 |  |
Other Current Liabilities | 205 | 179 |  |
Total Current Liabilities | 2,151 | 1,915 |  |
Casualty, Environmental and Other Reserves | 205 | 211 |  |
Long-term Debt | 15,993 | 14,739 |  |
Deferred Income Taxes - Net | 6,961 | 6,690 |  |
Long-term lease liabilities | 493 | 0 |  |
Other Long-term Liabilities | 591 | 594 |  |
Total Liabilities | 26,394 | 24,149 |  |
Shareholders' Equity: |  |  |  |
Common Stock, $1 Par Value | 773 | 818 |  |
Other Capital | 346 | 249 |  |
Retained Earnings | 11,404 | 12,157 |  |
Accumulated Other Comprehensive Loss | (675) | (661) |  |
Noncontrolling Minority Interest | 15 | 17 |  |
Total Shareholders' Equity | 11,863 | 12,580 | 14,721 | 11,694
Total Liabilities and Shareholders' Equity | $ 38,257 | $ 36,729 |  |
Common stock par value (in dollars per share) | $ 1 | $ 1 |  |
Investments in Conrail |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies |  | $ 943 |  |
Affiliates and Other Companies |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | $ 897 | 836 |  |
Investment in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 0 | 0 |  |
Eliminations and Other |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 8 | 12 | 6 | 17
Short-term Investments | 7 | 3 |  |
Accounts Receivable - Net | 13 | 6 |  |
Receivable from Affiliates | (8,459) | (6,234) |  |
Materials and Supplies | 0 | 0 |  |
Other Current Assets | 21 | 14 |  |
Total Current Assets | (8,410) | (6,199) |  |
Properties | 2,989 | 2,907 |  |
Accumulated Depreciation | (1,732) | (1,612) |  |
Properties - Net (Note 6) | 1,257 | 1,295 |  |
Right of Use Lease Asset (Note 7) | 18 |  |  |
Other Long-term Assets | (232) | (213) |  |
Total Assets | (40,900) | (36,191) |  |
Current Liabilities: |  |  |  |
Accounts Payable | 60 | 54 |  |
Labor and Fringe Benefits Payable | 65 | 69 |  |
Payable to Affiliates | (10,126) | (7,606) |  |
Casualty, Environmental and Other Reserves | 13 | 14 |  |
Current Maturities of Long-term Debt | 0 | 0 |  |
Income and Other Taxes Payable | 15 | 4 |  |
Other Current Liabilities | 13 | 6 |  |
Total Current Liabilities | (9,960) | (7,459) |  |
Casualty, Environmental and Other Reserves | 36 | 35 |  |
Long-term Debt | 0 | 0 |  |
Deferred Income Taxes - Net | 286 | 223 |  |
Long-term lease liabilities | 12 |  |  |
Other Long-term Liabilities | (316) | (338) |  |
Total Liabilities | (9,942) | (7,539) |  |
Shareholders' Equity: |  |  |  |
Common Stock, $1 Par Value | (181) | (181) |  |
Other Capital | (5,096) | (5,096) |  |
Retained Earnings | (25,646) | (23,322) |  |
Accumulated Other Comprehensive Loss | (35) | (53) |  |
Noncontrolling Minority Interest | 0 | 0 |  |
Total Shareholders' Equity | (30,958) | (28,652) |  |
Total Liabilities and Shareholders' Equity | (40,900) | (36,191) |  |
Eliminations and Other | Investments in Conrail |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 982 | 943 |  |
Eliminations and Other | Affiliates and Other Companies |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 13 | 16 |  |
Eliminations and Other | Investment in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | (34,528) | (32,033) |  |
CSX Corporation |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 814 | 716 | 274 | 305
Short-term Investments | 989 | 250 |  |
Accounts Receivable - Net | 4 | 1 |  |
Receivable from Affiliates | 1,054 | 1,020 |  |
Materials and Supplies | 0 | 0 |  |
Other Current Assets | 26 | 63 |  |
Total Current Assets | 2,887 | 2,050 |  |
Properties | 1 | 1 |  |
Accumulated Depreciation | (1) | (1) |  |
Properties - Net (Note 6) | 0 | 0 |  |
Right of Use Lease Asset (Note 7) | 0 |  |  |
Other Long-term Assets | 3 | 2 |  |
Total Assets | 37,379 | 34,046 |  |
Current Liabilities: |  |  |  |
Accounts Payable | 153 | 132 |  |
Labor and Fringe Benefits Payable | 38 | 41 |  |
Payable to Affiliates | 9,552 | 6,973 |  |
Casualty, Environmental and Other Reserves | 0 | 0 |  |
Current Maturities of Long-term Debt | 0 | 0 |  |
Income and Other Taxes Payable | (286) | (290) |  |
Other Current Liabilities | 0 | 11 |  |
Total Current Liabilities | 9,457 | 6,867 |  |
Casualty, Environmental and Other Reserves | 0 | 0 |  |
Long-term Debt | 15,534 | 14,029 |  |
Deferred Income Taxes - Net | (152) | (134) |  |
Long-term lease liabilities | 0 |  |  |
Other Long-term Liabilities | 692 | 721 |  |
Total Liabilities | 25,531 | 21,483 |  |
Shareholders' Equity: |  |  |  |
Common Stock, $1 Par Value | 773 | 818 |  |
Other Capital | 346 | 249 |  |
Retained Earnings | 11,404 | 12,157 |  |
Accumulated Other Comprehensive Loss | (675) | (661) |  |
Noncontrolling Minority Interest | 0 | 0 |  |
Total Shareholders' Equity | 11,848 | 12,563 |  |
Total Liabilities and Shareholders' Equity | 37,379 | 34,046 |  |
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 | Investment in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | 34,528 | 32,033 |  |
CSX Transportation |  |  |  |
Current Assets: |  |  |  |
Cash and Cash Equivalents | 136 | 130 | $ 121 | $ 281
Short-term Investments | 0 | 0 |  |
Accounts Receivable - Net | 969 | 1,003 |  |
Receivable from Affiliates | 7,405 | 5,214 |  |
Materials and Supplies | 261 | 263 |  |
Other Current Assets | 30 | 104 |  |
Total Current Assets | 8,801 | 6,714 |  |
Properties | 42,110 | 41,897 |  |
Accumulated Depreciation | (11,199) | (11,194) |  |
Properties - Net (Note 6) | 30,911 | 30,703 |  |
Right of Use Lease Asset (Note 7) | 514 |  |  |
Other Long-term Assets | 629 | 598 |  |
Total Assets | 41,778 | 38,874 |  |
Current Liabilities: |  |  |  |
Accounts Payable | 830 | 763 |  |
Labor and Fringe Benefits Payable | 386 | 440 |  |
Payable to Affiliates | 574 | 633 |  |
Casualty, Environmental and Other Reserves | 87 | 99 |  |
Current Maturities of Long-term Debt | 245 | 18 |  |
Income and Other Taxes Payable | 340 | 392 |  |
Other Current Liabilities | 192 | 162 |  |
Total Current Liabilities | 2,654 | 2,507 |  |
Casualty, Environmental and Other Reserves | 169 | 176 |  |
Long-term Debt | 459 | 710 |  |
Deferred Income Taxes - Net | 6,827 | 6,601 |  |
Long-term lease liabilities | 481 |  |  |
Other Long-term Liabilities | 215 | 211 |  |
Total Liabilities | 10,805 | 10,205 |  |
Shareholders' Equity: |  |  |  |
Common Stock, $1 Par Value | 181 | 181 |  |
Other Capital | 5,096 | 5,096 |  |
Retained Earnings | 25,646 | 23,322 |  |
Accumulated Other Comprehensive Loss | 35 | 53 |  |
Noncontrolling Minority Interest | 15 | 17 |  |
Total Shareholders' Equity | 30,973 | 28,669 |  |
Total Liabilities and Shareholders' Equity | 41,778 | 38,874 |  |
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 | 923 | 859 |  |
CSX Transportation | Investment in Consolidated Subsidiaries |  |  |  |
Current Assets: |  |  |  |
Investment in Affiliates and Other Companies | $ 0 | $ 0 |  |

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