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Acquisitions and Related Transactions Acquisitions (PreviousTransactions) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 05, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  | $ 9 | $ 12 | $ 2,815 |
SemGroup [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  |  |  | 244 |
Other Asset Impairment Charges |  |  |  |  | $ 129 |
Senior Notes |  |  | 1,375 |  |  |
SemGroup Subsidiary |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Senior Notes |  |  | $ 593 |  |  |
SemGroup [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term debt, less current maturities(1) | [1] |  |  |  |  | $ 2,576
SemGroup [Member] | Common Class A |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Common Stock, No Par Value |  | $ 0.01 |  |  | $ 0.01 |
Distribution Made to Limited Partner, Unit Distribution, Dilution Per Unit |  | 6.80 |  |  |  |
SemGroup [Member] | ET Common Units |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Share Price |  | $ 0.7275 |  |  | $ 0.7275 |
Preferred Units, Liquidation Spread, Percent |  | 101.00% |  |  | 101.00% |
[1] | Long-term debt at December 5, 2019 includes SemGroup senior notes with an aggregate principal amount of $1.375 billion and SemGroup subsidiary debt of $593 million, all of which was redeemed in December 2019, subsequent to the close of the SemGroup Transaction.

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