Net Income Per Limited Partner Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Income from continuing operations	$ 520	$ 1,012	$ 994
Less: Income (loss) from continuing operations attributable to noncontrolling interest	(487)	(176)	371
Income from continuing operations, net of noncontrolling interest	1,007	1,188	623
Less: General Partner’s interest in income from continuing operations	3	3	2
Convertible Unitholders’ interest in income	8	0	0
Less: Class D Unitholder’s interest in income from continuing operations	0	3	2
Income from continuing operations available to Limited Partners	996	1,182	619
Dilutive effect of equity-based compensation of subsidiaries, distributions to Class D Unitholder and Convertible Units	8	3	(2)
Diluted income from continuing operations available to Limited Partners	$ 1,004	$ 1,185	$ 617
Weighted average limited partner units	1,045.5	1,062.8	1,088.6
Basic income from continuing operations per Limited Partner unit	$ 0.95	$ 1.11	$ 0.57
Basic income (loss) from discontinued operations per Limited Partner unit	$ (0.01)	$ 0.00	$ 0.01
Dilutive effect of unconverted unit awards and Convertible Units	33.1	1.6	2.2
Weighted average limited partner units, assuming dilutive effect of unvested unit awards	1,078.6	1,064.4	1,090.8
Diluted income from continuing operations per Limited Partner unit	$ 0.93	$ 1.11	$ 0.57
Diluted income (loss) from discontinued operations per Limited Partner unit	$ (0.01)	$ 0.00	$ 0.01

Aggregate amount of net income from continuing operations allocated to Class D unitholder.

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The amount of net income (loss) from continuing operations allocated to the Convertible Unitholders.

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Amount of income (loss) from continuing operations attributable to the General Partner. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Amount of income (loss) from continuing operations available to limited partners. Also defined as limited partners' interest in income from continuing operations less: i) any additional earnings allocated from the General Partner and ii) any distributions on employee unit awards, net of allocation to the General Partner.

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Income from continuing operations, net of noncontrolling interest.

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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Amount after tax of income (loss) from continuing operations attributable to the noncontrolling interest.

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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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Per unit of ownership amount after tax of income (loss) from continuing operations available to limited partnership (LP) unit-holder and units that would have been outstanding assuming the issuance of limited partner units for dilutive potential units outstanding.

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Per unit of ownership amount after tax of income (loss) from continuing operations available to limited partnership (LP) unit-holder in a publicly trade limited partnership (LP) or master limited partnership (MLP).

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Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Weighted average number of limited partnership units outstanding determined by relating the portion of time within a reporting period that limited partnership units have been outstanding to the total time in that period.

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