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Summarized Consolidating Financial Data - Consolidating Cash Flow Statements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Operating Activities |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  | $ 2,009 | $ 1,566
Investing Activities |  |  |  |
Property Additions |  |  | (823) | (955)
Proceeds from Property Dispositions |  |  | 141 | 16
Purchase of Short-term Investments |  |  | (77) | (545)
Proceeds from Sales of Short-term Investments |  |  | 12 | 492
Other Investing Activities |  |  | (8) | 25
Net Cash Used In Investing Activities |  |  | (755) | (967)
Financing Activities |  |  |  |
Long-term Debt Issued |  |  | 2,000 | 850
Long-term Debt Repaid |  |  | 0 | (313)
Dividends Paid |  |  | (384) | (350)
Shares Repurchased | $ (974) | $ (499) | (1,810) | (757)
Accelerated Share Repurchase Pending Final Settlement (Note 2) |  |  | (90) | 0
Other Financing Activities |  |  | (51) | (12)
Net Cash Used in Financing Activities |  |  | (335) | (582)
Net Increase in Cash and Cash Equivalents |  |  | 919 | 17
Cash and Cash Equivalents at Beginning of Period |  |  | 401 | 603
Cash and Cash Equivalents at End of Period | 1,320 | 620 | 1,320 | 620
Eliminations and Other |  |  |  |
Operating Activities |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  | (547) | (221)
Investing Activities |  |  |  |
Property Additions |  |  | (61) | (82)
Proceeds from Property Dispositions |  |  | 0 | 0
Purchase of Short-term Investments |  |  | (2) | (6)
Proceeds from Sales of Short-term Investments |  |  | 12 | 2
Other Investing Activities |  |  | 92 | (8)
Net Cash Used In Investing Activities |  |  | 41 | (94)
Financing Activities |  |  |  |
Long-term Debt Issued |  |  | 0 | 0
Long-term Debt Repaid |  |  | 0 | 0
Dividends Paid |  |  | 500 | 300
Shares Repurchased |  |  | 0 | 0
Accelerated Share Repurchase Pending Final Settlement (Note 2) |  |  | 0 |
Other Financing Activities |  |  | 5 | 7
Net Cash Used in Financing Activities |  |  | 505 | 307
Net Increase in Cash and Cash Equivalents |  |  | (1) | (8)
Cash and Cash Equivalents at Beginning of Period |  |  | 6 | 17
Cash and Cash Equivalents at End of Period | 5 | 9 | 5 | 9
CSX Corporation |  |  |  |
Operating Activities |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  | 1,311 | 814
Investing Activities |  |  |  |
Property Additions |  |  | 0 | 0
Proceeds from Property Dispositions |  |  | 0 | 0
Purchase of Short-term Investments |  |  | (75) | (539)
Proceeds from Sales of Short-term Investments |  |  | 0 | 490
Other Investing Activities |  |  | (1) | (2)
Net Cash Used In Investing Activities |  |  | (76) | (51)
Financing Activities |  |  |  |
Long-term Debt Issued |  |  | 2,000 | 850
Long-term Debt Repaid |  |  | 0 | (313)
Dividends Paid |  |  | (384) | (350)
Shares Repurchased |  |  | (1,810) | (757)
Accelerated Share Repurchase Pending Final Settlement (Note 2) |  |  | (90) |
Other Financing Activities |  |  | (53) | (15)
Net Cash Used in Financing Activities |  |  | (337) | (585)
Net Increase in Cash and Cash Equivalents |  |  | 898 | 178
Cash and Cash Equivalents at Beginning of Period |  |  | 274 | 305
Cash and Cash Equivalents at End of Period | 1,172 | 483 | 1,172 | 483
CSX Transportation |  |  |  |
Operating Activities |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  | 1,245 | 973
Investing Activities |  |  |  |
Property Additions |  |  | (762) | (873)
Proceeds from Property Dispositions |  |  | 141 | 16
Purchase of Short-term Investments |  |  | 0 | 0
Proceeds from Sales of Short-term Investments |  |  | 0 | 0
Other Investing Activities |  |  | (99) | 35
Net Cash Used In Investing Activities |  |  | (720) | (822)
Financing Activities |  |  |  |
Long-term Debt Issued |  |  | 0 | 0
Long-term Debt Repaid |  |  | 0 | 0
Dividends Paid |  |  | (500) | (300)
Shares Repurchased |  |  | 0 | 0
Accelerated Share Repurchase Pending Final Settlement (Note 2) |  |  | 0 |
Other Financing Activities |  |  | (3) | (4)
Net Cash Used in Financing Activities |  |  | (503) | (304)
Net Increase in Cash and Cash Equivalents |  |  | 22 | (153)
Cash and Cash Equivalents at Beginning of Period |  |  | 121 | 281
Cash and Cash Equivalents at End of Period | $ 143 | $ 128 | $ 143 | $ 128

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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