Business Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Segment	Jun. 30, 2013
Business Segments [Abstract]
Number of reportable segments			5
Segment Gross Operating Margin [Abstract]
Revenues	$ 12,520.8	$ 11,149.3	$ 25,430.7	$ 22,532.4
Subtract operating costs and expenses	(11,639.1)	(10,367.2)	(23,519.6)	(20,787.6)
Add equity in income of unconsolidated affiliates	50.3	37.6	106.8	82.1
Add depreciation, amortization and accretion expense amounts not reflected in gross operating margin	312.4	289.7	613.8	566.5
Add impairment charges not reflected in gross operating margin	3.7	27.1	12.5	38.1
Subtract net gains or add net losses attributable to asset sales and insurance recoveries not reflected in gross operating margin	(6.8)	5.7	(96.4)	(58.2)
Add non-refundable deferred revenues attributable to shipper make-up rights on new pipeline projects reflected in gross operating margin	21.9	0	45.2	0
Total segment gross operating margin	1,263.2	1,142.2	2,593.0	2,373.3
Reconciliation of total Segment Gross Operating Margin [Abstract]
Total segment gross operating margin	1,263.2	1,142.2	2,593.0	2,373.3
Adjustments to reconcile total segment gross operating margin to operating income:
Subtract depreciation, amortization and accretion expense amounts not reflected in gross operating margin	(312.4)	(289.7)	(613.8)	(566.5)
Subtract impairment charges not reflected in gross operating margin	(3.7)	(27.1)	(12.5)	(38.1)
Add net gains or subtract net losses attributable to asset sales and insurance recoveries not reflected in gross operating margin (see Note 16)	6.8	(5.7)	96.4	58.2
Subtract non-refundable deferred revenues attributable to shipper make-up rights on new pipeline projects reflected in gross operating margin	(21.9)	0	(45.2)	0
Subtract general and administrative costs not reflected in gross operating margin	(47.7)	(45.5)	(100.9)	(95.0)
Operating income	884.3	774.2	1,917.0	1,731.9
Other expense, net	(227.8)	(200.5)	(449.0)	(396.5)
Income before income taxes	$ 656.5	$ 573.7	$ 1,468.0	$ 1,335.4

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The amount of expense recognized and charged to operating costs and expenses in the current period that reflects the allocation of the cost of assets over the assets' useful lives excluded from gross operating margin.

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The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss) recorded in operating costs and expenses excluded from gross operating margin.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Non-refundable deferred revenues attributable to shipper make-up rights on new pipeline projects included in gross operating margin.

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Operating income before: (i) depreciation, amortization and accretion expense; (ii) non-cash consolidated asset impairment charges; (iii) operating lease expenses for which we do not have the payment obligation; (iv) gains and losses from asset sales and related transactions and (v) general and administrative costs.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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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 from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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The net result for the period of deducting operating expenses from operating revenues.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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