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Goodwill (Notes) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill Disclosure [Text Block] | Goodwill Changes in the amounts of our goodwill for each of the years ended December 31, 2018 and 2017 are summarized by reporting unit as follows (in millions):
| Natural Gas Pipelines Regulated |  | Natural Gas Pipelines Non-Regulated |  | CO 2 |  | Products Pipelines |  | Products Pipelines Terminals |  | Terminals |  | Kinder Morgan Canada |  | Total
Historical Goodwill | $ | 15,892 |  |  | $ | 5,812 |  |  | $ | 1,528 |  |  | $ | 2,125 |  |  | $ | 221 |  |  | $ | 1,575 |  |  | $ | 562 |  |  | $ | 27,715 |
Accumulated impairment losses | (1,643 | ) |  | (1,597 | ) |  | — |  |  | (1,197 | ) |  | (70 | ) |  | (679 | ) |  | (377 | ) |  | (5,563 | )
December 31, 2016 | 14,249 |  |  | 4,215 |  |  | 1,528 |  |  | 928 |  |  | 151 |  |  | 896 |  |  | 185 |  |  | 22,152 |
Currency translation | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 13 |  |  | 13 |
Divestitures(a) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (3 | ) |  | — |  |  | (3 | )
December 31, 2017 | 14,249 |  |  | 4,215 |  |  | 1,528 |  |  | 928 |  |  | 151 |  |  | 893 |  |  | 198 |  |  | 22,162 |
Currency translation | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (8 | ) |  | (8 | )
Divestitures(b) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (190 | ) |  | (190 | )
Other | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
December 31, 2018 | $ | 14,249 |  |  | $ | 4,215 |  |  | $ | 1,528 |  |  | $ | 928 |  |  | $ | 151 |  |  | $ | 894 |  |  | $ | — |  |  | $ | 21,965 |
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(a) | 2017 includes $3 million related to certain terminal divestitures.
(b) | 2018 includes $190 million related to the TMPL Sale.
Refer to Note 2 “Summary of Significant Accounting Policies—Goodwill” for a description of our accounting for goodwill. We determine the fair value of each reporting unit as of May 31 of each year based primarily on a market approach utilizing enterprise value to estimated earning before interest, taxes, depreciation and amortization (EBITDA) multiples of comparable companies. The value of each reporting unit is determined on a stand-alone basis from the perspective of a market participant representing the price estimated to be received in a sale of the reporting unit in an orderly transaction between market participants at the measurement date. For our Natural Gas Pipelines Non-Regulated reporting unit, our May 31, 2018 annual test included a discounted cash flow analysis (income approach) to evaluate the fair value of this reporting unit to provide additional indication of fair value based on the present value of cash flows this reporting unit is expected to generate in the future. We weighted the market and income approaches for this reporting unit to arrive at an estimated fair value of this reporting unit giving more weighting on the income approach and less on the market approach as we believed the value indicated using the income approach is more representative of the value that could be received from a market participant. As of May 31, 2018, each of our reporting units indicated a fair value in excess of their respective carrying values (by at least 10%) and step 2 was not required. The results of our Step 1 analysis did not indicate an impairment of goodwill and we did not identify any triggers for further impairment analysis during the remainder of the year. A continued period of volatile commodity prices could result in deterioration of market multiples, comparable sales transactions prices, weighted average costs of capital, and our cash flow estimates. A significant unfavorable change to any one or combination of these factors would result in a change to the reporting unit fair values discussed above potentially resulting in future impairments of long-lived assets, equity method investments, and/or goodwill. Such non-cash impairments could have a significant effect on our results of operations.

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