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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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