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Subsequent Event (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Subsequent Event [Line Items]
Net income available to common unitholders (see Note 13)	$ 636.5	$ 552.5	$ 1,433.8	$ 1,306.0
Basic earnings per unit:
Weighted-average number of common units outstanding, as reported (in units)	915.5	889.1	914.8	885.4
Basic earnings per unit, as reported (in dollars per unit)	$ 0.70	$ 0.62	$ 1.57	$ 1.48
Diluted earnings per unit:
Weighted-average number of common units outstanding, as reported (in units)	940.2	918.5	939.1	914.8
Diluted earnings per unit, as reported (in dollars per unit)	$ 0.68	$ 0.60	$ 1.53	$ 1.43
Subsequent Event [Member]
Basic earnings per unit:
Weighted-average number of common units outstanding, pro forma (in units)	1,831.0	1,778.2	1,829.6	1,770.8
Basic earnings per unit, pro forma (in dollars per unit)	$ 0.35	$ 0.31	$ 0.78	$ 0.74
Diluted earnings per unit:
Weighted-average number of common units outstanding, pro forma (in units)	1,880.4	1,837.0	1,878.2	1,829.6
Diluted earnings per unit, pro forma (in dollars per unit)	$ 0.34	$ 0.30	$ 0.76	$ 0.71

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Net income available to common unit holders, which excludes undistributed earnings allocated and distributions paid on phantom unit awards.

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Pro forma basic earnings per share or earnings per unit, which is commonly presented in initial public offerings based on the terms of the offering.

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Pro forma diluted earnings per share, which is commonly presented in initial public offerings.

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Per unit of ownership amount after tax of income (loss) 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) available to outstanding limited partnership (LP) unit-holder.

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