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Estimates (Schedule Of Goodwill) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill |  |  | $ 5,167 |  |  | $ 5,167 | $ 4,885
Goodwill acquired |  |  |  |  |  | 9 | 307
Goodwill | $ 2,391 |  |  | $ 5,167 |  | 2,391 | 5,167
Goodwill impairment |  |  |  | (9) | $ (12) | (2,815) | (21)
Goodwill, Other Changes |  |  |  |  |  | 30 | (4)
Intrastate Transportation And Storage [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill |  |  | 10 |  |  | 10 | 10
Goodwill acquired |  |  |  |  |  | 0 | 0
Goodwill | 0 |  |  | 10 |  | 0 | 10
Goodwill impairment | (10) |  |  |  |  | (10) | 0
Goodwill, Other Changes |  |  |  |  |  | 0 | 0
Interstate Transportation and Storage [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill |  |  | 226 |  |  | 226 | 196
Goodwill acquired |  |  |  |  |  | 0 | 42
Goodwill | 0 |  |  | 226 |  | 0 | 226
Goodwill impairment |  | $ (43) | (183) |  |  | (226) | (12)
Goodwill, Other Changes |  |  |  |  |  | 0 | 0
Midstream [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill |  |  | 483 |  |  | 483 | 492
Goodwill acquired |  |  |  |  |  | 0 | 0
Goodwill | 0 |  |  | 483 |  | 0 | 483
Goodwill impairment |  |  | (483) | (378) |  | (483) | (9)
Goodwill, Other Changes |  |  |  |  |  | 0 | 0
NGL and refined products transportation and services [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill |  |  | 693 |  |  | 693 | 693
Goodwill acquired |  |  |  |  |  | 0 | 0
Goodwill | 693 |  |  | 693 |  | 693 | 693
Goodwill impairment |  |  |  |  |  | 0 | 0
Goodwill, Other Changes |  |  |  |  |  | 0 | 0
Crude oil transportation and services [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill |  |  | 1,397 |  |  | 1,397 | 1,167
Goodwill acquired |  |  |  |  |  | 0 | 230
Goodwill | 52 |  |  | 1,397 |  | 52 | 1,397
Goodwill impairment |  | (1,280) |  |  |  | (1,279) | 0
Goodwill, Other Changes |  |  |  |  |  | (66) | 0
Investment In Sunoco LP [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill |  |  | 1,555 |  |  | 1,555 | 1,559
Goodwill acquired |  |  |  |  |  | 9 | 0
Goodwill | 1,564 |  |  | 1,555 |  | 1,564 | 1,555
Goodwill impairment |  |  |  |  |  | 0 | 0
Goodwill, Other Changes |  |  |  |  |  | 0 | (4)
Investment In USAC [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill |  |  | 619 |  |  | 619 | 619
Goodwill acquired |  |  |  |  |  | 0 | 0
Goodwill | 0 |  |  | 619 |  | 0 | 619
Goodwill impairment |  |  | (619) |  |  | (619) | 0
Goodwill, Other Changes |  |  |  |  |  | 0 | 0
Other Segments [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill |  |  | 184 |  |  | 184 | 149
Goodwill acquired |  |  |  |  |  | 0 | 35
Goodwill | 82 |  |  | $ 184 |  | 82 | 184
Goodwill impairment | $ (15) | $ (132) | $ (40) |  |  | (198) | 0
Goodwill, Other Changes |  |  |  |  |  | $ 96 | $ 0

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