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Goodwill (Notes) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill Disclosure [Text Block] | 8. Goodwill Changes in the amounts of our goodwill for each of the years ended December 31, 2020 and 2019 are summarized by reporting unit as follows:
| Natural Gas Pipelines Regulated |  | Natural Gas Pipelines Non-Regulated |  | CO 2 |  | Products Pipelines |  | Products Pipelines Terminals |  | Terminals |  |  |  | Total |
| (In millions) |
Gross goodwill | $ | 15,892 |  |  | $ | 5,812 |  |  | $ | 1,528 |  |  | $ | 2,125 |  |  | $ | 221 |  |  | $ | 1,573 |  |  |  |  | $ | 27,151 |  |
Accumulated impairment losses | (1,643) |  |  | (1,597) |  |  | — |  |  | (1,197) |  |  | (70) |  |  | (679) |  |  |  |  | (5,186) |  |
December 31, 2018 | 14,249 |  |  | 4,215 |  |  | 1,528 |  |  | 928 |  |  | 151 |  |  | 894 |  |  |  |  | 21,965 |  |
Divestitures(a) | — |  |  | (422) |  |  | — |  |  | — |  |  | — |  |  | (92) |  |  |  |  | (514) |  |
Transfer(b) | — |  |  | (450) |  |  | — |  |  | 450 |  |  | — |  |  | — |  |  |  |  | — |  |
December 31, 2019 | 14,249 |  |  | 3,343 |  |  | 1,528 |  |  | 1,378 |  |  | 151 |  |  | 802 |  |  |  |  | 21,451 |  |
Impairments(c) | — |  |  | (1,000) |  |  | (600) |  |  | — |  |  | — |  |  | — |  |  |  |  | (1,600) |  |
Transfer | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  | — |  |
December 31, 2020 | 14,249 |  |  | 2,343 |  |  | 928 |  |  | 1,378 |  |  | 151 |  |  | 802 |  |  |  |  | 19,851 |  |
Gross goodwill | 15,892 |  |  | 4,940 |  |  | 1,528 |  |  | 2,575 |  |  | 221 |  |  | 1,481 |  |  |  |  | 26,637 |  |
Accumulated impairment losses | (1,643) |  |  | (2,597) |  |  | (600) |  |  | (1,197) |  |  | (70) |  |  | (679) |  |  |  |  | (6,786) |  |
December 31, 2020 | $ | 14,249 |  |  | $ | 2,343 |  |  | $ | 928 |  |  | $ | 1,378 |  |  | $ | 151 |  |  | $ | 802 |  |  |  |  | $ | 19,851 |  |
(a)2019 includes $514 million related to the KML and U.S. Cochin Sale. See Note 4 for more information. (b)Effective January 1, 2019, for segment reporting purposes, certain assets were transferred among our business segments which resulted in the transfer of goodwill from the Natural Gas Pipelines Non-Regulated reporting unit to the Products Pipelines reporting unit. See Note 16 for more information. (c)See Note 3 “Impairments and Losses and Gains on Divestitures—Goodwill Impairments” for further information regarding our goodwill impairments.

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- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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