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Partners' Capital and Distributions - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions					6 Months Ended
	Aug. 12, 2016	Jul. 11, 2016	May 13, 2016	Feb. 12, 2016	Jun. 30, 2016	Jun. 30, 2015
Partners Capital and Distributions
Total distributions paid					$ 868	$ 811
First Quarter Distribution
Partners Capital and Distributions
Distribution declared, date			Apr. 07, 2016
Distribution payment date			May 13, 2016
Fourth Quarter Distribution
Partners Capital and Distributions
Distribution declared, date				Jan. 12, 2016
Distribution payment date				Feb. 12, 2016
Forecast | Second Quarter Distribution
Partners Capital and Distributions
Distribution payment date	Aug. 12, 2016
Subsequent Event | Second Quarter Distribution
Partners Capital and Distributions
Distribution declared, date		Jul. 11, 2016
Unitholders of record, date		Jul. 29, 2016
Partners' Capital Excluding Noncontrolling Interests
Partners Capital and Distributions
Total distributions paid					$ 866	$ 810
Partners' Capital Excluding Noncontrolling Interests | Cash Distributions | First Quarter Distribution
Partners Capital and Distributions
Distributions paid to General Partner			$ 155
Total distributions paid			$ 433
Partners' Capital Excluding Noncontrolling Interests | Cash Distributions | Fourth Quarter Distribution
Partners Capital and Distributions
Distributions paid to General Partner				$ 155
Total distributions paid				$ 433
Partners' Capital Excluding Noncontrolling Interests | Cash Distributions | Forecast | Second Quarter Distribution
Partners Capital and Distributions
Distributions paid to General Partner	$ 155
Total distributions paid	433
Common Units | Cash Distributions | First Quarter Distribution
Partners Capital and Distributions
Distributions per common unit, paid (in dollars per unit)			$ 0.70
Common Units | Cash Distributions | Fourth Quarter Distribution
Partners Capital and Distributions
Distributions per common unit, paid (in dollars per unit)				$ 0.70
Common Units | Cash Distributions | Subsequent Event | Second Quarter Distribution
Partners Capital and Distributions
Distributions per common unit, declared (in dollars per unit)		$ 0.70
Common Units | Partners' Capital Excluding Noncontrolling Interests | Cash Distributions | First Quarter Distribution
Partners Capital and Distributions
Distributions paid to Unitholders			$ 278
Common Units | Partners' Capital Excluding Noncontrolling Interests | Cash Distributions | Fourth Quarter Distribution
Partners Capital and Distributions
Distributions paid to Unitholders				$ 278
Common Units | Partners' Capital Excluding Noncontrolling Interests | Cash Distributions | Forecast | Second Quarter Distribution
Partners Capital and Distributions
Distributions paid to Unitholders	278
Series A Preferred Units | Partners' Capital Excluding Noncontrolling Interests | In-Kind Distributions | First Quarter Distribution
Partners Capital and Distributions
Distributions paid to Unitholders			$ 23
Distribution of units in lieu of cash (in units)			858,439
Series A Preferred Units | Partners' Capital Excluding Noncontrolling Interests | In-Kind Distributions | Forecast | Second Quarter Distribution
Partners Capital and Distributions
Distributions paid to Unitholders	$ 33
Distribution of units in lieu of cash (in units)	1,237,765

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