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Business Segments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) Segment	Mar. 31, 2015 USD ($)
Business Segments [Abstract]
Number of reportable segments | Segment	5
Segment Gross Operating Margin [Abstract]
Revenues	$ 5,005.3	$ 7,472.5
Subtract operating costs and expenses	(4,146.9)	(6,616.4)
Add equity in income of unconsolidated affiliates	101.1	89.2
Add depreciation, amortization and accretion expense amounts not reflected in gross operating margin	358.2	345.3
Add impairment charges not reflected in gross operating margin	1.7	33.3
Add net losses or subtract net gains attributable to asset sales not reflected in gross operating margin	4.9	(0.1)
Add non-refundable deferred revenues attributable to shipper make-up rights on major new pipeline projects reflected in gross operating margin	7.1	30.7
Subtract subsequent recognition of deferred revenues attributable to make-up rights not reflected in gross operating margin	(12.9)	(20.1)
Total segment gross operating margin	1,318.5	1,334.4
Reconciliation of total Segment Gross Operating Margin [Abstract]
Total segment gross operating margin	1,318.5	1,334.4
Adjustments to reconcile total segment gross operating margin to operating income:
Subtract depreciation, amortization and accretion expense amounts not reflected in gross operating margin	(358.2)	(345.3)
Subtract impairment charges not reflected in gross operating margin	(1.7)	(33.3)
Add net gains or subtract net losses attributable to asset sales not reflected in gross operating margin	(4.9)	0.1
Subtract non-refundable deferred revenues attributable to shipper make-up rights on major new pipeline projects reflected in gross operating margin	(7.1)	(30.7)
Add subsequent recognition of deferred revenues attributable to make-up rights not reflected in gross operating margin	12.9	20.1
Subtract general and administrative costs not reflected in gross operating margin	(43.9)	(49.3)
Operating income	915.6	896.0
Other expense, net	(237.0)	(238.6)
Income before income taxes	$ 678.6	$ 657.4

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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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Operating income before: (i) depreciation, amortization and accretion expense; (ii) non-cash consolidated asset impairment charges; (iii) operating lease expenses for which the entity does 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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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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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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