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Reportable Segments (Advances to and investments in affiliates) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Investments in unconsolidated affiliates	$ 2,947	$ 3,060	$ 3,460
Intrastate Transportation and Storage
Segment Reporting Information [Line Items]
Investments in unconsolidated affiliates	110	89	88
Interstate Transportation and Storage
Segment Reporting Information [Line Items]
Investments in unconsolidated affiliates	2,209	2,278	2,524
Midstream
Segment Reporting Information [Line Items]
Investments in unconsolidated affiliates	101	110	112
NGL and Refined Products Transportation and Services
Segment Reporting Information [Line Items]
Investments in unconsolidated affiliates	476	509	461
Crude Oil Transportation and Services
Segment Reporting Information [Line Items]
Investments in unconsolidated affiliates	0	22	242
All Other
Segment Reporting Information [Line Items]
Investments in unconsolidated affiliates	$ 51	$ 52	$ 33

X

- Definition

Amount of investment in equity method investee and investment in and advance to affiliate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

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+ References

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