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Equity - Cash Distributions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Incentive Distribution Made to Managing Member or General Partner [Line Items]
General partner's distributions	$ 6	$ 4	$ 11	$ 8
General partner's incentive distribution rights	70	46	130	86
Total general partner's distributions	76	50	141	94
Partners' distributions	311	231	590	431
Limited Partners Common Units [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Partners' distributions	218	172	416	328
Preferred Units [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Partners' distributions	$ 17	$ 9	$ 33	$ 9

X

- Definition

Amount of incentive obligation earned in cash or stock during the period by a limited partnership general partner and paid after the end of the accounting period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of cash or stock or unit payment to a limited liability corporation managing member or limited partnership general partner, excluding payments for incentive distributions, after the end of the accounting period.

+ References

No definition available.

+ Details

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- Definition

Total amount of cash or stock or unit payment to LP partners earned during the applicable period.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of cash or stock or unit payment to a limited liability corporation managing member or limited partnership general partner after the end of the accounting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 73
-URI http://asc.fasb.org/extlink&oid=6926462&loc=SL5163674-159010

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 72
-URI http://asc.fasb.org/extlink&oid=6926462&loc=SL5163672-159010

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 103
-URI http://asc.fasb.org/extlink&oid=65015998&loc=SL5199526-159011

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