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Summarized Consolidating Financial Data - Consolidating Cash Flow Statements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Operating Activities |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  | $ 3,406 | $ 2,861
Investing Activities |  |  |  |
Property Additions |  |  | (1,240) | (1,462)
Proceeds from Property Dispositions |  |  | 257 | 38
Purchase of Short-term Investments |  |  | (611) | (645)
Proceeds from Sales of Short-term Investments |  |  | 15 | 957
Other Investing Activities |  |  | (8) | 33
Net Cash Used In Investing Activities |  |  | (1,587) | (1,079)
Financing Activities |  |  |  |
Long-term Debt Issued |  |  | 2,000 | 850
Long-term Debt Repaid |  |  | (19) | (332)
Dividends Paid |  |  | (570) | (530)
Shares Repurchased | $ (1,000) | $ (1,000) | (2,816) | (1,763)
Accelerated Share Repurchase Pending Final Settlement (Note 2) |  |  | (100) | 0
Other Financing Activities |  |  | (52) | (19)
Net Cash Used in Financing Activities |  |  | (1,557) | (1,794)
Net Increase (Decrease) in Cash and Cash Equivalents |  |  | 262 | (12)
Cash and Cash Equivalents at Beginning of Period |  |  | 401 | 603
Cash and Cash Equivalents at End of Period | 663 | 591 | 663 | 591
Eliminations and Other |  |  |  |
Operating Activities |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  | (803) | (273)
Investing Activities |  |  |  |
Property Additions |  |  | (106) | (151)
Proceeds from Property Dispositions |  |  | 0 | 0
Purchase of Short-term Investments |  |  | (2) | (6)
Proceeds from Sales of Short-term Investments |  |  | 15 | 2
Other Investing Activities |  |  | 142 | (25)
Net Cash Used In Investing Activities |  |  | 49 | (180)
Financing Activities |  |  |  |
Long-term Debt Issued |  |  | 0 | 0
Long-term Debt Repaid |  |  | 0 | 0
Dividends Paid |  |  | 750 | 450
Shares Repurchased |  |  | 0 | 0
Accelerated Share Repurchase Pending Final Settlement (Note 2) |  |  | 0 |
Other Financing Activities |  |  | 8 | (3)
Net Cash Used in Financing Activities |  |  | 758 | 447
Net Increase (Decrease) in Cash and Cash Equivalents |  |  | 4 | (6)
Cash and Cash Equivalents at Beginning of Period |  |  | 6 | 17
Cash and Cash Equivalents at End of Period | 10 | 11 | 10 | 11
CSX Corporation |  |  |  |
Operating Activities |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  | 2,417 | 1,590
Investing Activities |  |  |  |
Property Additions |  |  | 0 | 0
Proceeds from Property Dispositions |  |  | 0 | 0
Purchase of Short-term Investments |  |  | (609) | (639)
Proceeds from Sales of Short-term Investments |  |  | 0 | 955
Other Investing Activities |  |  | (1) | (2)
Net Cash Used In Investing Activities |  |  | (610) | 314
Financing Activities |  |  |  |
Long-term Debt Issued |  |  | 2,000 | 850
Long-term Debt Repaid |  |  | 0 | (312)
Dividends Paid |  |  | (570) | (530)
Shares Repurchased |  |  | (2,816) | (1,763)
Accelerated Share Repurchase Pending Final Settlement (Note 2) |  |  | (100) |
Other Financing Activities |  |  | (58) | (21)
Net Cash Used in Financing Activities |  |  | (1,544) | (1,776)
Net Increase (Decrease) in Cash and Cash Equivalents |  |  | 263 | 128
Cash and Cash Equivalents at Beginning of Period |  |  | 274 | 305
Cash and Cash Equivalents at End of Period | 537 | 433 | 537 | 433
CSX Transportation |  |  |  |
Operating Activities |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  | 1,792 | 1,544
Investing Activities |  |  |  |
Property Additions |  |  | (1,134) | (1,311)
Proceeds from Property Dispositions |  |  | 257 | 38
Purchase of Short-term Investments |  |  | 0 | 0
Proceeds from Sales of Short-term Investments |  |  | 0 | 0
Other Investing Activities |  |  | (149) | 60
Net Cash Used In Investing Activities |  |  | (1,026) | (1,213)
Financing Activities |  |  |  |
Long-term Debt Issued |  |  | 0 | 0
Long-term Debt Repaid |  |  | (19) | (20)
Dividends Paid |  |  | (750) | (450)
Shares Repurchased |  |  | 0 | 0
Accelerated Share Repurchase Pending Final Settlement (Note 2) |  |  | 0 |
Other Financing Activities |  |  | (2) | 5
Net Cash Used in Financing Activities |  |  | (771) | (465)
Net Increase (Decrease) in Cash and Cash Equivalents |  |  | (5) | (134)
Cash and Cash Equivalents at Beginning of Period |  |  | 121 | 281
Cash and Cash Equivalents at End of Period | $ 116 | $ 147 | $ 116 | $ 147

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