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Partners' Capital and Distributions - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions						9 Months Ended
	Nov. 14, 2016	Oct. 31, 2016	Aug. 12, 2016	May 13, 2016	Feb. 12, 2016	Sep. 30, 2016	Sep. 30, 2015
Partners Capital and Distributions
Total distributions paid						$ 1,302	$ 1,240
Third Quarter Distribution | Forecast
Partners Capital and Distributions
Distribution payment date	Nov. 14, 2016
Second Quarter Distribution
Partners Capital and Distributions
Distribution payment date			Aug. 12, 2016
First Quarter Distribution
Partners Capital and Distributions
Distribution payment date				May 13, 2016
Fourth Quarter Distribution
Partners Capital and Distributions
Distribution payment date					Feb. 12, 2016
Partners’ Capital Excluding Noncontrolling Interests
Partners Capital and Distributions
Total distributions paid						$ 1,299	$ 1,238
Partners’ Capital Excluding Noncontrolling Interests | Cash Distributions | Third Quarter Distribution | Forecast
Partners Capital and Distributions
Distributions paid to General Partner	$ 101
Total distributions paid	$ 328
Partners’ Capital Excluding Noncontrolling Interests | Cash Distributions | Second Quarter Distribution
Partners Capital and Distributions
Distributions paid to General Partner			$ 155
Total distributions paid			$ 433
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
Common Units | Cash Distributions | Third Quarter Distribution | Forecast
Partners Capital and Distributions
Distributions per common unit, paid (usd per unit)	$ 0.55
Common Units | Cash Distributions | Second Quarter Distribution
Partners Capital and Distributions
Distributions per common unit, paid (usd per unit)			$ 0.70
Common Units | Cash Distributions | First Quarter Distribution
Partners Capital and Distributions
Distributions per common unit, paid (usd per unit)				$ 0.70
Common Units | Cash Distributions | Fourth Quarter Distribution
Partners Capital and Distributions
Distributions per common unit, paid (usd per unit)					$ 0.70
Common Units | Partners’ Capital Excluding Noncontrolling Interests | Cash Distributions | Third Quarter Distribution | Forecast
Partners Capital and Distributions
Distributions paid to Unitholders	$ 227
Common Units | Partners’ Capital Excluding Noncontrolling Interests | Cash Distributions | Second Quarter Distribution
Partners Capital and Distributions
Distributions paid to Unitholders			$ 278
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
Series A Preferred Units | Partners’ Capital Excluding Noncontrolling Interests | In-Kind Distributions | Third Quarter Distribution | Forecast
Partners Capital and Distributions
Distributions paid to Unitholders	$ 33
Distribution of units in lieu of cash (units)	1,262,522
Series A Preferred Units | Partners’ Capital Excluding Noncontrolling Interests | In-Kind Distributions | Second Quarter Distribution
Partners Capital and Distributions
Distributions paid to Unitholders			$ 33
Distribution of units in lieu of cash (units)			1,237,765
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 (units)				858,439
Subsequent Event | Third Quarter Distribution
Partners Capital and Distributions
Unitholders of record, date		Oct. 31, 2016

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