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Investments and Noncontrolling Interest (Equity Method Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Sep. 01, 2017	Jan. 01, 2017
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 4,174	$ 4,010
Centrahoma Processing LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%
Equity method investments	$ 160	121
Explorer
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	25.00%		25.00%
Equity method investments	$ 90	89
Illinois Extension
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	35.00%		35.00%
Equity method investments	$ 275	284
LOCAP
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	59.00%		59.00%
Equity method investments	$ 27	24
LOOP
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	41.00%		41.00%
Equity method investments	$ 226	225
MarEn Bakken
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	25.00%
Equity method investments	$ 498	520
Jefferson Dry Gas
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	67.00%
Equity method investments	$ 236	164
MarkWest Utica EMG
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	56.00%
Equity method investments	$ 2,039	2,139
Sherwood Midstream LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%
Equity method investments	$ 366	236
Sherwood Midstream Holdings
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	80.00%
Equity method investments	$ 157	165
Sherwood Midstream Holdings | Direct Ownership Interest
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	60.00%			79.00%
Other VIEs and Non-VIEs [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 100	$ 43

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
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- Definition

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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