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Impairments (Tables) | 12 Months Ended
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Dec. 31, 2017
Impairments [Abstract] |
Impairment of Goodwill, Long-lived assets and equity investments [Table Text Block] | We recognized the following non-cash pre-tax impairment charges and losses (gains) on divestitures of assets (in millions):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Natural Gas Pipelines |  |  |  |  |
Impairment of goodwill | $ | — |  |  | $ | — |  |  | $ | 1,150 |
Impairments of long-lived assets(a) | 30 |  |  | 106 |  |  | 79 |
Losses on divestitures of long-lived assets(b) | — |  |  | 94 |  |  | 43 |
Impairments of equity investments(c) | 150 |  |  | 606 |  |  | 26 |
Impairments at equity investees(d) | 10 |  |  | 7 |  |  | — |
CO 2 |  |  |  |  |
Impairments of long-lived assets(e) | (1 | ) |  | 20 |  |  | 606 |
Gains on divestitures of long-lived assets | — |  |  | (1 | ) |  | — |
Impairments at equity investee(d) | (4 | ) |  | 9 |  |  | 26 |
Terminals |  |  |  |  |
Impairments of long-lived assets(f) | 3 |  |  | 19 |  |  | 188 |
(Gains) losses on divestitures of long-lived assets(g) | (18 | ) |  | 80 |  |  | 3 |
Losses on impairments and divestitures of equity investments, net | — |  |  | 16 |  |  | 4 |
Products Pipelines |  |  |  |  |
Impairments of long-lived assets(h) | — |  |  | 66 |  |  | — |
Losses (gains) on divestitures of long-lived assets | — |  |  | 10 |  |  | 1 |
Gain on divestiture of equity investment | — |  |  | (12 | ) |  | — |
Other losses (gains) on divestitures of long-lived assets | 2 |  |  | (7 | ) |  | (1 | )
Pre-tax losses on impairments and divestitures, net | $ | 172 |  |  | $ | 1,013 |  |  | $ | 2,125 |
_______ (a) 2017 amount represents the impairment of our Colden storage facility, of which $3 million is included in “Costs of sales” on our accompanying consolidated statement of income. 2016 amount represents the project write-off of our portion of the Northeast Energy Direct (NED) Market project. 2015 amount represents $47 million and $32 million of project write-offs in our non-regulated midstream and regulated natural gas pipelines assets, respectively. (b) 2016 amount primarily relates to our sale of a 50% interest in SNG. (c) 2017 amount represents the impairment of our investment in FEP. 2016 amount includes a $350 million impairment of our investment in MEP and a $250 million impairment of our investment in Ruby. 2015 amount is primarily related to an impairment of an investment in a gathering and processing asset in Oklahoma. (d) Amounts represent losses on impairments recorded by equity investees and are included in “Earnings from equity investments” on our accompanying consolidated statements of income. (e) 2015 amount includes (i) $399 million related to oil and gas properties and (ii) $207 million related to the certain CO 2 source and transportation project write-offs. (f) 2015 amount is primarily related to certain terminals with significant coal operations, including a $175 million impairment of a terminal facility reflecting the impact of an agreement to adjust certain payment terms under a contract with a coal customer in February 2016. (g) 2017 amount includes a $23 million gain related to the sale of a 40% membership interest in the Deeprock Development joint venture. 2016 amount primarily relates to the sale of 20 bulk terminals that handle mostly coal and steel products, predominately located along the inland river system. (h) 2016 amount represents project write-offs associated with the canceled Palmetto project.

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