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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
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 RegulatedNatural Gas Pipelines Non-Regulated
CO2
Products PipelinesProducts Pipelines TerminalsTerminalsTotal
(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, 201814,249 4,215 1,528 928 151 894 21,965 
Divestitures(a)— (422)— — — (92)(514)
Transfer(b)— (450)— 450 — — — 
December 31, 201914,249 3,343 1,528 1,378 151 802 21,451 
Impairments(c)— (1,000)(600)— — — (1,600)
Transfer— — — — — — — 
December 31, 202014,249 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.