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Related Party Transactions - Payables To Related Parties (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Payables to related parties	$ 53	$ 53
Illinois Extension Pipeline
Related Party Transaction [Line Items]
Payables to related parties	8	9
LOCAP
Related Party Transaction [Line Items]
Payables to related parties	2	2
LOOP
Related Party Transaction [Line Items]
Payables to related parties	5	6
MarkWest Utica EMG
Related Party Transaction [Line Items]
Payables to related parties	28	24
Ohio Condensate
Related Party Transaction [Line Items]
Payables to related parties	2	1
Sherwood Midstream Holdings
Related Party Transaction [Line Items]
Payables to related parties	3	0
TAAE
Related Party Transaction [Line Items]
Payables to related parties	2	2
TACE
Related Party Transaction [Line Items]
Payables to related parties	2	4
TAME
Related Party Transaction [Line Items]
Payables to related parties	1	4
Other equity method investees
Related Party Transaction [Line Items]
Payables to related parties	$ 0	$ 1

X

- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

No definition available.

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