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Summarized Consolidating Financial Data - Consolidating Cash Flow Statements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 23, 2016
Sep. 30, 2017
Sep. 23, 2016
Operating Activities        
Net Cash Provided by (Used in) Operating Activities     $ 2,861 $ 2,488
Investing Activities        
Property Additions     (1,462) (1,590)
Purchase of Short-term Investments     (645) (410)
Proceeds from Sales of Short-term Investments     957 1,070
Other Investing Activities     71 37
Net Cash Used In Investing Activities     (1,079) (893)
Financing Activities        
Long-term Debt Issued     850 0
Long-term Debt Repaid     (332) (19)
Dividends Paid     (530) (513)
Shares Repurchased $ (1,000) $ (263) (1,763) (778)
Other Financing Activities     (19) (310)
Net Cash Used in Financing Activities     (1,794) (1,620)
Net Decrease in Cash and Cash Equivalents     (12) (25)
Cash and Cash Equivalents at Beginning of Period     603 628
Cash and Cash Equivalents at End of Period 591 603 591 603
Eliminations and Other        
Operating Activities        
Net Cash Provided by (Used in) Operating Activities     (273) (245)
Investing Activities        
Property Additions     (151) (121)
Purchase of Short-term Investments     (6) 0
Proceeds from Sales of Short-term Investments     2 0
Other Investing Activities     (25) (67)
Net Cash Used In Investing Activities     (180) (188)
Financing Activities        
Long-term Debt Issued     0 0
Long-term Debt Repaid     0 (1)
Dividends Paid     450 450
Shares Repurchased     0 0
Other Financing Activities     (3) 0
Net Cash Used in Financing Activities     447 449
Net Decrease in Cash and Cash Equivalents     (6) 16
Cash and Cash Equivalents at Beginning of Period     17 9
Cash and Cash Equivalents at End of Period 11 25 11 25
CSX Corporation        
Operating Activities        
Net Cash Provided by (Used in) Operating Activities     1,590 644
Investing Activities        
Property Additions     0 0
Purchase of Short-term Investments     (639) (410)
Proceeds from Sales of Short-term Investments     955 1,070
Other Investing Activities     (2) (3)
Net Cash Used In Investing Activities     314 657
Financing Activities        
Long-term Debt Issued     850 0
Long-term Debt Repaid     (312) 0
Dividends Paid     (530) (513)
Shares Repurchased     (1,763) (778)
Other Financing Activities     (21) (6)
Net Cash Used in Financing Activities     (1,776) (1,297)
Net Decrease in Cash and Cash Equivalents     128 4
Cash and Cash Equivalents at Beginning of Period     305 444
Cash and Cash Equivalents at End of Period 433 448 433 448
CSX Transportation        
Operating Activities        
Net Cash Provided by (Used in) Operating Activities     1,544 2,089
Investing Activities        
Property Additions     (1,311) (1,469)
Purchase of Short-term Investments     0 0
Proceeds from Sales of Short-term Investments     0 0
Other Investing Activities     98 107
Net Cash Used In Investing Activities     (1,213) (1,362)
Financing Activities        
Long-term Debt Issued     0 0
Long-term Debt Repaid     (20) (18)
Dividends Paid     (450) (450)
Shares Repurchased     0 0
Other Financing Activities     5 (304)
Net Cash Used in Financing Activities     (465) (772)
Net Decrease in Cash and Cash Equivalents     (134) (45)
Cash and Cash Equivalents at Beginning of Period     281 175
Cash and Cash Equivalents at End of Period $ 147 $ 130 $ 147 $ 130