Net Income per Limited Partner Unit Table - Income Reconciliation (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Reconciliation of income from continuing operations to income from continuing operations available to limited partners [Line Items]
Income from continuing operations	$ 424	$ 300
Less: Income from continuing operations attributable to noncontrolling interest	259	224
Income from continuing operations, net of noncontrolling interest	165	76
Less: Class D Unitholder’s interest in income from continuing operations	1	0
Income from continuing operations available to Limited Partners	164	76
Basic Income from Continuing Operations per Limited Partner Unit:
Weighted average Limited Partner units	557.7	559.9
Basic income from continuing operations per Limited Partner unit	$ 0.30	$ 0.14
Basic income from discontinued operations per Limited Partner unit	$ 0.00	$ 0.02
Diluted Income from Continuing Operations per Limited Partner Unit:
Dilutive effect of equity-based compensation of subsidiaries and distributions to Class D unitholder	(1)	0
Diluted income from continuing operations available to Limited Partners	$ 163	$ 76
Dilutive effect of unconverted unit awards	0.7	0
Weighted average limited partner units, assuming dilutive effect of unvested unit awards	558.4	559.9
Diluted income from continuing operations per Limited Partner unit	$ 0.30	$ 0.14
Diluted income from discontinued operations per Limited Partner unit	$ 0.00	$ 0.02

Aggregate amount of net income allocated to Class D unitholder.

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Amount of the Parent Company's portion of the dilutive effect of its subsidiaries as a result of the respective subsidiaries' 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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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 income (loss) from continuing operations attributable to the noncontrolling interest. 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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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and 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 general partnership units have been outstanding to the total time in that period.

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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. Used in the calculation of diluted net income or loss per limited partnership unit.

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