Spectra Energy Partners 10-Q7 Nov 132013 Q3 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 30, 2013
Document and Entity Information [Abstract]	'
Document Type	'10-Q
Amendment Flag	'false
Document Period End Date	30-Sep-13
Document Fiscal Year Focus	'2013
Document Fiscal Period Focus	'Q3
Trading Symbol	'SEP
Entity Registrant Name	'SPECTRA ENERGY PARTNERS, LP
Entity Central Index Key	'0001394074
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Large Accelerated Filer
Entity Common Stock, Shares Outstanding	115,871,489
Entity General Partner, Units Outstanding	2,364,726

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Revenues	'	'	'	'
Transportation of natural gas	$52.20	$53	$159.50	$163.70
Storage of natural gas and other	10.2	4.2	26.7	14.1
Transportation of crude oil	70.7	0	150.6	0
Total operating revenues	133.1	57.2	336.8	177.8
Operating Expenses	'	'	'	'
Operating, maintenance and other	51	17.4	119.2	48.8
Depreciation and amortization	15.9	9.3	42.7	27.9
Property and other taxes	7.1	2.8	17.4	9.2
Total operating expenses	74	29.5	179.3	85.9
Operating Income	59.1	27.7	157.5	91.9
Other Income and Expenses	'	'	'	'
Equity in earnings of unconsolidated affiliates	30.5	26.4	91.5	77.6
Other income and expenses, net	1	0	0.4	0.1
Total other income and expenses	31.5	26.4	91.9	77.7
Interest Income	0.1	0	0.5	0
Interest Expense	13.4	7.7	35.2	23.1
Earnings Before Income Taxes	77.3	46.4	214.7	146.5
Income Tax Expense	1.7	0.3	2.7	1.1
Net Income	75.6	46.1	212	145.4
Net Income - Noncontrolling Interests	16	0	34.4	0
Net Income - Controlling Interests	59.6	46.1	177.6	145.4
Calculation of Limited Partners' Interest in Net Income:	'	'	'	'
Net Income - Controlling Interests	59.6	46.1	177.6	145.4
Less: General partner's interest in net income	11.8	7.3	31.2	20.6
Limited partners' interest in net income	$47.80	$38.80	$146.40	$124.80
Weighted-average limited partner units outstanding - basic and diluted (in units)	113.4	96.3	108.5	96.3
Net income per limited partner unit-basic and diluted (in dollars per unit)	0.42	0.4	1.35	1.3
Distributions paid per limited partner unit during the periods presented (in dollars per unit)	$0.51	$0.49	$1.50	$1.44

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net Income	$75.60	$46.10	$212	$145.40
Other comprehensive income (loss)	'	'	'	'
Foreign currency translation adjustments	0.6	0	0.6	0
Reclassification of cash flow hedges	-0.2	-0.1	-0.5	-0.4
Total other comprehensive income (loss)	0.4	-0.1	0.1	-0.4
Total Comprehensive Income	76	46	212.1	145
Less: Comprehensive Income-Noncontrolling Interests	16	0	34.4	0
Comprehensive Income-Controlling Interests	$60	$46	$177.70	$145

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current Assets	'	'
Cash and cash equivalents	$92.50	$20.60
Other investments	10.3	0
Receivables, net	59.4	29.2
Other	10.6	5.5
Total current assets	172.8	55.3
Investments and Other Assets	'	'
Investments in unconsolidated affiliates	894.8	921.2
Goodwill	939.8	461.7
Other investments-restricted funds	2,002.80	140.7
Other	0	0.7
Total investments and other assets	3,837.40	1,524.30
Property, Plant and Equipment	'	'
Cost	2,853.70	1,475.90
Less accumulated depreciation and amortization	306	269.6
Net property, plant and equipment	2,547.70	1,206.30
Regulatory Assets and Deferred Debits	23.1	19.8
Total Assets	6,581	2,805.70
Current Liabilities	'	'
Accounts payable	51.6	14.4
Commercial paper	545.1	336.4
Taxes accrued	19.1	8.8
Interest accrued	12.9	1.3
Note payable-affiliates	15.7	17
Current maturities of long-term debt	28.5	0
Other	22.9	8.2
Total current liabilities	695.8	386.1
Long-term Debt	2,786.10	699.6
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	44.6	9.4
Other	7	5
Total deferred credits and other liabilities	51.6	14.4
Commitments and Contingencies	'	'
Partners' Capital	'	'
Common units (115.9 million and 103.6 million units issued and outstanding at September 30, 2013 and December 31, 2012, respectively)	2,137.50	1,659.50
General partner units (2.4 million and 2.1 million units issued and outstanding at September 30, 2013 and December 31, 2012, respectively)	54.3	42.2
Accumulated other comprehensive income	4	3.9
Total partners' capital	2,195.80	1,705.60
Noncontrolling interests	851.7	0
Total equity	3,047.50	1,705.60
Total Liabilities and Equity	$6,581	$2,805.70

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Common units, units issued	115.9	103.6
Common units, units outstanding	115.9	103.6
General partner units, units issued	2.4	2.1
General partner units, units outstanding	2.4	2.1

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net income	$212	$145.40
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	43.9	29.1
Deferred income tax expense	1.4	1.1
Equity in earnings of unconsolidated affiliates	-91.5	-77.6
Distributions received from unconsolidated affiliates	98.6	80.7
Other	12.3	6.4
Net cash provided by operating activities	276.7	185.1
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-31.3	-27.7
Investment expenditures	-1.5	-13.8
Acquisitions, net of cash acquired	-342.9	0
Distributions received from unconsolidated affiliates	17.4	11.2
Purchases of held-to-maturity securities	-39.5	0
Proceeds from sales and maturities of held-to-maturity securities	36	0
Purchases of available-for-sale securities	-5,663	0
Proceeds from sales and maturities of available-for-sale securities	3,800.90	0
Other	0.1	0.2
Net cash used in investing activities	-2,223.80	-30.1
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from the issuance of long-term debt	1,887	0
Payments for the redemption of long-term debt	-14	0
Net increase in commercial paper	208.7	13.9
Distributions to noncontrolling interests	-33.2	0
Proceeds from issuance of units	193.3	0
Proceeds on notes payable-affiliates	0	5
Payments on notes payable-affiliates	-1.3	-15.5
Distributions to partners	-216.2	-158.2
Other	-5.3	0
Net cash provided by (used in) financing activities	2,019	-154.8
Net increase in cash and cash equivalents	71.9	0.2
Cash and cash equivalents at beginning of period	20.6	0.8
Cash and cash equivalents at end of period	92.5	1
Supplemental Disclosures	'	'
Property, plant and equipment noncash accruals	$0.80	$3

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Equity (USD $)	Total	Limited Partners Common	General Partner	Accumulated Other Comprehensive Income	Noncontrolling Interests
In Millions, unless otherwise specified	Total	Limited Partners Common	General Partner	Accumulated Other Comprehensive Income	Noncontrolling Interests
Beginning Balance at Dec. 31, 2011	$1,697.70	$1,653.60	$39.60	$4.50	'
Increase (Decrease) in Equity [Roll Forward]	'	'	'	'	'
Net Income	145.4	124.8	20.6	'	'
Other comprehensive income (loss)	-0.4	'	'	-0.4	'
Issuance of units	0.5	0.5	'	'	'
Attributed deferred tax expense	-0.1	-0.1	'	'	'
Distributions to partners	-158.2	-138.8	-19.4	'	'
Ending Balance at Sep. 30, 2012	1,684.90	1,640	40.8	4.1	'
Beginning Balance at Dec. 31, 2012	1,705.60	1,659.50	42.2	3.9	'
Increase (Decrease) in Equity [Roll Forward]	'	'	'	'	'
Net Income	212	146.4	31.2	'	34.4
Other comprehensive income (loss)	0.1	'	'	0.1	'
Excess purchase price over net acquired assets in Express-Platte	20	19.6	0.4	'	'
Acquisition of interests in Express US	850.5	'	'	'	850.5
Issuance of units	512.7	502.4	10.3	'	'
Distributions to partners	-194.1	-164.8	-29.3	'	'
Express-Platte distributions to partners (pre-acquisition)	-55.3	-21.7	-0.4	'	-33.2
Other, net	-4	-3.9	-0.1	'	'
Ending Balance at Sep. 30, 2013	$3,047.50	$2,137.50	$54.30	$4	$851.70

General

General	9 Months Ended
General	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
General	'
	1. General
	The terms “we,” “our,” “us” and “Spectra Energy Partners” as used in this report refer collectively to Spectra Energy Partners, LP and its subsidiaries unless the context suggests otherwise. These terms are used for convenience only and are not intended as a precise description of any separate legal entity within Spectra Energy Partners.
	Nature of Operations. Spectra Energy Partners, through its subsidiaries and equity affiliates, is engaged in the transportation and gathering of natural gas through interstate pipeline systems located throughout the United States, and the storage of natural gas in underground facilities that are located in southeast Texas, south central Louisiana and southwest Virginia. As a result of our acquisition on August 2, 2013 of interests in the Express-Platte crude oil pipeline system (Express-Platte), which connects Canadian and U.S. producers to refineries in the U.S. Rocky Mountain and Midwest regions, we are also engaged in the transportation of crude oil. We acquired the remaining interest in Express-Platte in the fourth quarter of 2013.
	Basis of Presentation. The Condensed Consolidated Financial Statements include our accounts and those of our subsidiaries, after eliminating intercompany transactions and balances. These interim financial statements should be read in conjunction with the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2012, and reflect all normal recurring adjustments that are, in our opinion, necessary to fairly present our results of operations and financial position. Amounts reported in the Condensed Consolidated Statements of Operations are not necessarily indicative of amounts expected for the respective annual periods.
	On March 14, 2013, Spectra Energy Corp (Spectra Energy) acquired 100% of the ownership interests in Express-Platte from third-parties. On August 2, 2013, we acquired a 40% ownership interest in the U.S. portion of Express-Platte (Express US) and a 100% ownership interest in the Canadian portion of Express-Platte (Express Canada) from subsidiaries of Spectra Energy (collectively, the Express-Platte acquisition). We determined that Express US is a variable interest entity (VIE) whereby we are the primary beneficiary based upon, among other things, the interdependencies that exist between Express Canada and Express US. As a result, at September 30, 2013, we present Express US on a 100%-consolidated basis, with the associated 60% interest that we did not own as of September 30, 2013 presented as noncontrolling interests. On November 1, 2013, we acquired the remaining 60% of Express US. As such, Express US will no longer be considered a VIE, and will be a 100%-consolidated entity with no associated noncontrolling interests effective November 1, 2013.
	As the Express-Platte acquisition represented a transfer of entities under common control, the Condensed Consolidated Financial Statements and related information presented herein have been recast to include the historical results of Express-Platte since March 14, 2013, the date of Spectra Energy's acquisition of Express-Platte.
	Use of Estimates. To conform with generally accepted accounting principles (GAAP) in the United States, we make estimates and assumptions that affect the amounts reported in the Condensed Consolidated Financial Statements and Notes to Condensed Consolidated Financial Statements. Although these estimates are based on our best available knowledge at the time, actual results could differ.

Acquisitions

Acquisitions	9 Months Ended
Acquisitions	Sep. 30, 2013
Business Combinations [Abstract]	'
Acquisitions	'
	2. Acquisitions
	Express-Platte. On August 2, 2013, we acquired a 40% ownership interest in Express US and a 100% ownership interest in Express Canada from subsidiaries of Spectra Energy for $410.4 million in cash and 7.2 million of newly issued common and general partner units (valued at $318.8 million). The Express-Platte pipeline system, which begins in Hardisty, Alberta, and terminates in Wood River, Illinois, is comprised of both the Express and Platte crude oil pipelines. The Express pipeline carries crude oil to U.S. refining markets in the Rockies area, including Montana, Wyoming, Colorado and Utah. The Platte pipeline, which interconnects with the Express pipeline in Casper, transports crude oil predominantly from the Bakken shale and western Canada to refineries in the Midwest. The completion of the acquisition expands our growth platform to include the rapidly growing North American crude oil transportation and storage market and diversifies our profile of steady, fee-based cash flows with an escalating-fee asset.
	The following table summarizes the preliminary fair values of the assets and liabilities as of March 14, 2013, the acquisition date of Express-Platte from third-parties by Spectra Energy. Subsequent adjustments may be recorded upon the completion of the valuation and the final determination of the purchase price allocation.



		Purchase Price
		Allocation
		(in millions)
	Cash	$	67.5
	Cash	$	67.5
	Receivables	21.3
	Receivables	21.3
	Other current assets	10.2
	Other current assets	10.2
	Goodwill	478.1
	Goodwill	478.1
	Property, plant and equipment	1,352.50
	Property, plant and equipment	1,352.50
	Accounts payable	(20.4		)
	Other current liabilities	(19.1		)
	Deferred credits and other liabilities	(327.1		)
	Long-term debt, including current portion	(241.9		)
	Total assets acquired/liabilities assumed	$	1,321.10
	Total assets acquired/liabilities assumed	$	1,321.10
	The following tables present summarized financial information for Express US, which is a VIE, on a 100%-consolidated basis since March 14, 2013, the acquisition date of Express US from third-parties by Spectra Energy.


		Three Months Ended				Nine Months Ended
		30-Sep-13				30-Sep-13
		(in millions)
	Operating revenues	$	61.1			$	131.7
	Operating revenues	$	61.1			$	131.7
	EBIT	29.4				63.6
	EBIT	29.4				63.6
	Net income	26.6				57.3
	Net income	26.6				57.3


		September 30,
		2013
		(in millions)
	Total current assets	$	75.1
	Total current assets	$	75.1
	Investments and other assets	431.6
	Investments and other assets	431.6
	Net property, plant and equipment	1,112.90
	Net property, plant and equipment	1,112.90
	Total Assets	1,619.60
	Total Assets	1,619.60
	Total current liabilities	55
	Total current liabilities	55
	Long-term debt	145.1
	Long-term debt	145.1
	Equity	1,419.50
	Equity	1,419.50
	Total Liabilities and Equity	$	1,619.60
	Total Liabilities and Equity	$	1,619.60
	The following table presents pro forma results of operations information that reflect the acquisition of Express-Platte as if the acquisition had occurred as of January 1, 2012, adjusted for items that are directly attributable to the acquisition. This information has been compiled from current and historical financial statements, and is not necessarily indicative of the results that actually would have been achieved had the transaction occurred at the beginning of the periods presented or that may be achieved in the future.


		Three Months							Nine Months
		Ended September 30,							Ended September 30,
	2013				2012			2013		2012
	(in millions, except per-unit amounts)
Operating revenues	$	133.1			$	129.5		$	395.1	$	373.2
Operating revenues	$	133.1			$	129.5		$	395.1	$	373.2
Earnings before income taxes	77.3				83.3			217.3		227.3
Earnings before income taxes	77.3				83.3			217.3		227.3
Net income	75.6				83			214.6		226.2
Net income	75.6				83			214.6		226.2
Net income-controlling interests	59.6				71			175.2		202.2
Net income-controlling interests	59.6				71			175.2		202.2
Net income per limited partner unit—basic and diluted	0.41				0.61			1.26		1.73
Net income per limited partner unit—basic and diluted	0.41				0.61			1.26		1.73
As of September 30, 2013, Express-Platte debt, including current maturities, totaled $227.9 million, consisting of $117.9 million of 7.39% subordinated notes due 2019 and $110.0 million of 6.09% senior notes due 2020. The notes are secured by the assignment of the Express-Platte transportation receivables and by the assets of the Express Canada pipeline system assets.
U.S. assets acquisition. On August 5, 2013, we entered into a definitive agreement with Spectra Energy to acquire ownership interests in its remaining Spectra Energy U.S. transmission, storage and liquids assets, including Spectra Energy’s remaining 60% interest in the U.S. portion of Express-Platte (the Dropdown Transactions). The pipeline systems include Texas Eastern Transmission, LP (Texas Eastern), Algonquin Gas Transmission, LLC, the remaining 60% ownership interest in Express US, an additional 38.77% interest in Maritimes & Northeast Pipeline, L.L.C. (M&N US), 33.3% interests in both DCP Sand Hills Pipeline, LLC (Sand Hills) and DCP Southern Hills Pipeline, LLC (Southern Hills), an additional 1% interest in Gulfstream Natural Gas System, L.L.C. (Gulfstream) and a 50% interest in Southeast Supply Header, LLC. The natural gas and crude oil storage businesses include Bobcat Gas Storage, the remaining 50% interest in Market Hub, a 49.9% interest in Steckman Ridge, LP, and Texas Eastern's and Express-Platte's storage facilities. Aggregate consideration for the Dropdown Transactions, when completed, will be approximately 175.5 million in newly issued Spectra Energy Partners partnership units and approximately $2,300.0 million in cash. The contributed entities had approximately $2,400.0 million of third-party debt at the date of the contribution. On November 1, 2013, we completed the closing of substantially all of the Dropdown Transactions. We paid Spectra Energy aggregate consideration with the issuance of approximately 171.1 million newly issued partnership units and $2,300.0 million in cash. The first of the remaining two closings of the Dropdown Transactions is expected to occur at least 12 months following the November 1, 2013 closing, with the final closing expected to occur at least 12 months thereafter.
M&N US. On October 31, 2012, we acquired a 38.76% ownership interest in M&N US from Spectra Energy for approximately $318.7 million in cash and approximately $56.2 million in common and general partner units. As of the acquisition date, M&N US had debt outstanding of $429.0 million. M&N US owns a Federal Energy Regulatory Commission (FERC) regulated mainline interstate natural gas transportation system in the United States which extends from the Canadian border near Baileyville, Maine to northeastern Massachusetts. M&N US’ pipeline location and key interconnects with Spectra Energy’s transmission system link regional natural gas supplies to the northeast U.S. and Atlantic Canadian markets.
The M&N US acquisition represented a transaction between entities under common control, but did not represent a change in reporting entity. Accordingly, the Condensed Consolidated Financial Statements and related information presented herein include the results of the acquisition of M&N US as of the date of the acquisition.

Business_Segments

Business Segments	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Business Segments	'
	3. Business Segments
	We manage our business in two reportable segments: Gas Transportation and Storage, and Liquids. Our chief operating decision maker regularly reviews financial information about both segments in deciding how to allocate resources and evaluate performance. There is no aggregation of segments within our reportable business segments.
	The Gas Transportation and Storage segment provides interstate transportation, storage and gathering services of natural gas, and the storage and redelivery of liquefied natural gas for customers in the southeastern quadrant of the United States. Substantially all of our operations are subject to the FERC and the U.S. Department of Transportation’s (DOT) rules and regulations. This segment includes East Tennessee Natural Gas, LLC (East Tennessee), Ozark Gas Transmission, L.L.C. (Ozark Gas Transmission) and Ozark Gas Gathering, L.L.C. (Ozark Gas Gathering) (collectively, hereafter referred to as “Ozark”), Saltville Gas Storage, L.L.C. (Saltville) and Big Sandy Pipeline, L.L.C. (Big Sandy).
	Liquids, a newly formed segment effective with the August 2, 2013 Express-Platte acquisition, provides transportation of crude oil. The Express pipeline carries crude oil from Alberta, Canada to refining markets in the Rockies area. The Platte pipeline, which interconnects with Express pipeline in Casper, Wyoming, transports crude oil predominantly from the Bakken shale and western Canada to refineries in the Midwest. These operations are primarily subject to the rules and regulations of the FERC and the National Energy Board (NEB).
	The remainder of our operations is presented as “Other.” While it is not considered a business segment, Other includes our equity investments in Gulfstream, Market Hub Partners Holding (Market Hub), M&N US and unallocated corporate costs.
	Gulfstream provides interstate natural gas pipeline transportation from Pascagoula, Mississippi and Mobile, Alabama across the Gulf of Mexico into Florida for customers in central and southern Florida. Gulfstream’s operations are subject to the rules and regulations of the FERC and DOT.
	Market Hub owns and operates two natural gas storage facilities, Moss Bluff and Egan, which are located in southeast Texas and south central Louisiana, respectively. Market Hub’s operations are subject to the rules and regulations of DOT. Moss Bluff is also subject to the rules and regulations of the Railroad Commission of Texas, while Egan is also subject to the rules and regulations of the FERC.
	M&N US owns an interstate natural gas pipeline that extends from the Canadian border near Baileyville, Maine to northeastern Massachusetts. The M&N US pipeline links regional gas supplies with Northeast U.S. and Atlantic Canadian markets. M&N US’ operations are subject to the rules and regulations of the FERC.
	Management evaluates segment performance based on earnings before interest and taxes from continuing operations (EBIT). On a segment basis, EBIT represents all profits from continuing operations (both operating and non-operating) before deducting interest and income taxes, net of noncontrolling interests related to those earnings.
	Business Segment Data



			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2013		2012		2013		2012
			(in millions)
	Operating revenues
	Gas Transportation and Storage		$	56.8	$	57.2	$	174.6	$	177.8

	Liquids		76.3		—		162.2		—

	Other		—		—		—		—

	Total operating revenues		$	133.1	$	57.2	$	336.8	$	177.8

	Segment EBIT
	Gas Transportation and Storage		$	29.8	$	29.6	$	94.4	$	97.9

	Liquids (a)		19.1		—		37.9		—

	Other		23.6		24.5		79.6		71.7

	Total EBIT		72.5		54.1		211.9		169.6

	Interest income and other (b)		18.2		—		38		—

	Interest expense		13.4		7.7		35.2		23.1

	Earnings before income taxes		$	77.3	$	46.4	$	214.7	$	146.5



	(a)	Presented net of EBIT's noncontrolling interests for Liquids.

	(b)	Includes foreign currency transaction gains and losses and the add-back of noncontrolling interests related to segment EBIT.



			30-Sep-13		31-Dec-12
			(in millions)
	Segment Assets
	Gas Transportation and Storage		$	1,714.10	$	1,715.00

	Liquids		1,937.50		—

	Total reportable segments		3,651.60		1,715.00

	Other		2,929.40		1,090.70

	Total consolidated		$	6,581.00	$	2,805.70

Regulatory_Matters

Regulatory Matters	9 Months Ended
Regulatory Matters	Sep. 30, 2013
Regulated Operations [Abstract]	'
Regulatory Matters	'
	4. Regulatory Matters
	Express-Platte. Express Pipeline Limited Partnership’s (Express LP’s) proposal for increases in uncommitted rates filed with the NEB became effective on April 1, 2013. Express Pipeline LLC’s (Express LLC’s) and Platte Pipe Line Company, LLC’s (Platte LLC’s) proposals for increases in uncommitted rates filed with the FERC became effective on July 1, 2013. Express LP’s, Express LLC’s and Platte LLC’s proposals for increases in joint committed rates filed with the NEB and FERC also became effective on April 1, 2013. Express LP, Express LLC and Platte LLC filed new joint committed rates with the NEB and FERC with an effective date of October 1, 2013.
	Saltville. Saltville received FERC approval on September 26, 2013 to amend its current rate settlement and extend the deadline to file a Section 4 rate case from October 1, 2013 to February 1, 2014. The extension allows Saltville and its customers to continue discussions towards a new settlement agreement in lieu of the required Section 4 rate case filing.

Net_Income_Per_Limited_Partner

Net Income Per Limited Partner Unit and Cash Distributions	9 Months Ended
Net Income Per Limited Partner Unit and Cash Distributions	Sep. 30, 2013
Equity [Abstract]	'
Net Income Per Limited Partner Unit and Cash Distributions	'
	5. Net Income Per Limited Partner Unit and Cash Distributions
	The following table presents our net income per limited partner unit calculations:



			Three Months Ended							Nine Months Ended
			September 30,							September 30,
			2013				2012			2013		2012
			(in millions, except per unit amounts)
	Net income-controlling interests		$	59.6			$	46.1		$	177.6	$	145.4
	Net income-controlling interests		$	59.6			$	46.1		$	177.6	$	145.4
	Less:
	General partner’s interest in net income—2%		1.2				0.9			3.6		2.9
	General partner’s interest in net income—2%		1.2				0.9			3.6		2.9
	General partner’s interest in net income attributable to incentive distribution rights		10.6				6.4			27.6		17.7
			10.6				6.4			27.6		17.7
	Limited partners’ interest in net income		$	47.8			$	38.8		$	146.4	$	124.8
	Limited partners’ interest in net income		$	47.8			$	38.8		$	146.4	$	124.8
	Weighted average limited partner units outstanding—basic and diluted		113.4				96.3			108.5		96.3
			113.4				96.3			108.5		96.3
	Net income per limited partner unit—basic and diluted		$	0.42			$	0.4		$	1.35	$	1.3
	Net income per limited partner unit—basic and diluted		$	0.42			$	0.4		$	1.35	$	1.3
	The partnership agreement requires that, within 60 days after the end of each quarter, we distribute all of our Available Cash, as defined, to unitholders of record on the applicable record date.
	Available Cash. Available Cash, for any quarter, consists of all cash on hand at the end of that quarter:

	•	less the amount of cash reserves established by the general partner to:

	•	provide for the proper conduct of business,

	•	comply with applicable law, any debt instrument or other agreement, or

	•	provide funds for distributions to the unitholders and to the general partner for any one or more of the next four quarters,

	•	plus, if the general partner so determines, all or a portion of cash on hand on the date of determination of Available Cash for the quarter.
	Incentive Distribution Rights. The general partner holds incentive distribution rights beyond the first target distribution in accordance with the partnership agreement as follows:



			Total Quarterly Distribution		Marginal Percentage
			Total Quarterly Distribution		Interest in Distributions
			Target Per-Unit Amount		Common			General
			Target Per-Unit Amount		Unitholders			Partner
	Minimum Quarterly Distribution		$0.30		98	%		2	%
	First Target Distribution		up to $0.345		98	%		2	%
	Second Target Distribution		above $0.345 up to $0.375		85	%		15	%
	Third Target Distribution		above $0.375 up to $0.45		75	%		25	%
	Thereafter		above $0.45		50	%		50	%
	To the extent these incentive distributions are made to our general partner, there will be more Available Cash proportionately allocated to our general partner than to holders of common units. A cash distribution of $0.51625 per limited partner unit was declared on October 17, 2013 and is payable on November 14, 2013 to unitholders of record at the close of business on October 31, 2013.

Investments_in_Unconsolidated_

Investments in Unconsolidated Affiliates	9 Months Ended
	Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Investments in Unconsolidated Affiliates	'
	6. Investments in Unconsolidated Affiliates
	As of September 30, 2013, our investments in unconsolidated affiliates consist of a 49% interest in Gulfstream, a 50% interest in Market Hub and a 38.76% interest in M&N US, all of which are accounted for using the equity method.
	For the nine months ended September 30, 2013, we received total distributions of $63.5 million from Gulfstream, of which $49.7 million were included in Cash Flows From Operating Activities—Distributions Received From Unconsolidated Affiliates and $13.8 million were included in Cash Flows From Investing Activities—Distributions Received From Unconsolidated Affiliates. For the nine months ended September 30, 2012, we received total distributions of $57.1 million, of which $45.9 million were included in Cash Flows From Operating Activities—Distributions Received From Unconsolidated Affiliates and $11.2 million were included in Cash Flows From Investing Activities—Distributions Received From Unconsolidated Affiliates.
	We received distributions from Market Hub of $28.7 million during the nine months ended September 30, 2013 and $34.8 million during the same period in 2012, all of which were included in Cash Flows From Operating Activities—Distributions Received From Unconsolidated Affiliates.
	In the fourth quarter of 2012, we purchased a 38.76% ownership in M&N US from Spectra Energy. See Note 2 for further discussion. We received distributions from M&N US of $23.8 million during the nine months ended September 30, 2013, of which $20.2 million were included in Cash Flows From Operating Activities—Distributions Received From Unconsolidated Affiliates and $3.6 million were included in Cash Flows from Investing Activities—Distributions Received from Unconsolidated Affiliates.
	Investments in Unconsolidated Affiliates



			September 30,			December 31,
			2013			2012
			(in millions)
	Gulfstream		$	331.2		$	345.5

	Market Hub		372.6			378.2

	M&N US		191			197.5

	Total		$	894.8		$	921.2

	Equity in Earnings of Unconsolidated Affiliates



			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2013			2012			2013			2012
			(in millions)
	Gulfstream		$	17.5		$	16.8		$	49.7		$	46.6

	Market Hub		6.5			9.6			21.6			31

	M&N US (a)		6.5			—			20.2			—

	Total		$	30.5		$	26.4		$	91.5		$	77.6



	(a)	We acquired a 38.76% interest of M&N US during the fourth quarter of 2012. The equity earnings related to the acquired interest was recorded prospectively from the date of the acquisition.
	Summarized Financial Information of Unconsolidated Affiliates (Presented at 100%)



			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2013			2012			2013			2012
			(in millions)
	Gulfstream
	Operating revenues		$	69.5		$	70.1		$	205.5		$	206.6

	Operating expenses		16.3			18.4			51.4			58.9

	Operating income		53.2			51.7			154.1			147.7

	Net income		35.7			34.3			101.5			95.1

	Market Hub
	Operating revenues		21.5			27.2			70.5			86.3

	Operating expenses		8.4			7.9			27.6			24.3

	Operating income		13.1			19.3			42.9			62

Net income		13.1			19.1			43.2			62

M&N US (a)
Operating revenues		40.7			—			123.7			—

Operating expenses		14.8			—			43.1			—

Operating income		25.9			—			80.6			—

Net income		16.6			—			52			—



(a)	We acquired a 38.76% interest in M&N US in the fourth quarter of 2012. Summarized financial information is included for periods after date of acquisition.

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2013
Goodwill [Abstract]	'
Goodwill	'
	7. Goodwill
	We perform our goodwill impairment test annually and evaluate goodwill when events or changes in circumstances indicate that its carrying value may not be recoverable. We completed our annual goodwill impairment test as of April 1, 2013 and no impairments were identified.
	We perform our annual review for goodwill impairment at the reporting unit level, which is identified by assessing whether the components of our operating segments constitute businesses for which discrete financial information is available, whether segment management regularly reviews the operating results of those components and whether the economic and regulatory characteristics are similar. We determined that our reporting units are equivalent to our reportable segments.
	As permitted under accounting guidance on testing goodwill for impairment, we perform either a qualitative or quantitative assessment on our reporting unit based on management's judgment. With respect to our qualitative assessment, we consider events and circumstances specific to us, such as macroeconomic conditions, industry and market considerations, cost factors and overall financial performance, when evaluating whether it is more likely than not that the fair value of our reporting unit is less than its respective carrying amount.
	In connection with our quantitative assessment, we primarily use a discounted cash flow analysis to determine fair value of our reporting unit. Key assumptions in the determination of fair value include the use of an appropriate discount rate and estimated future cash flows. In estimating cash flows, we incorporate expected long-term growth rates in key markets served by our operations, regulatory stability, and the ability to renew contracts, as well as other factors that affect our reporting units' revenue, expense and capital expenditure projections.
	The following presents changes in goodwill during 2013:



		Goodwill
		(in millions)
	31-Dec-12	$	461.7

	Acquisition of interests in Express-Platte	478.1

	30-Sep-13	$	939.8

	See Note 2 for discussion of the acquisition of interests in Express-Platte.

Marketable_Securities_and_Rest

Marketable Securities and Restricted Funds	9 Months Ended
	Sep. 30, 2013
Investments Schedule [Abstract]	'
Marketable Securities	'
	8. Marketable Securities and Restricted Funds
	We may actively invest a portion of our cash balances in various financial instruments, including taxable debt securities and short-term money market funds. We do not purchase marketable securities for speculative purposes; therefore, we do not have any securities classified as trading securities. While we do not routinely sell marketable securities prior to their scheduled maturity dates, some of our investments are held and restricted for the purposes of funding future capital expenditures and acquisitions, so these investments are classified as available-for-sale (AFS) marketable securities as they may occasionally be sold prior to their scheduled maturity dates due to the unexpected timing of cash needs. Initial investments in securities are classified as purchases of the respective types of securities (AFS marketable securities or held-to-maturity (HTM) marketable securities). Maturities of securities are classified within proceeds from sales and maturities of securities in the Condensed Consolidated Statements of Cash Flows.
	AFS Securities. All of our AFS securities are restricted funds and are as follows:



		Estimated Fair Value

		September 30, 2013		December 31, 2012
		(in millions)
	Commercial paper	$	119.5	$	140.7

	Money market funds	1,883.30		—

	Total available-for-sale securities	$	2,002.80	$	140.7

	All of our AFS marketable securities are classified as Investments and Other Assets - Other Investments-Restricted Funds on the Condensed Consolidated Balance Sheets as of September 30, 2013 and December 31, 2012, respectively.
	During the second quarter of 2013, we invested the proceeds from our issuance of common units in AFS marketable securities. These securities are restricted for the purpose of funding future capital expenditures and acquisitions.
	In September 2013, we issued $1,900.0 million of long-term debt for which the net proceeds are restricted for the purpose of paying a portion of the cash consideration to Spectra Energy for the acquisition of its remaining U.S. transmission, storage, and liquids assets.
	At September 30, 2013, the weighted-average contractual maturity of outstanding AFS securities was less than one year.
	There were no material gross unrealized holding gains or losses associated with investments in AFS securities at September 30, 2013 or December 31, 2012.
	HTM Securities. All of our HTM securities are restricted funds. We had $10.3 million of money market securities classified as Current Assets - Other Investments on the Condensed Consolidated Balance Sheets as of September 30, 2013. These securities are restricted pursuant to certain Express-Platte debt agreements.
	At September 30, 2013, the weighted-average contractual maturity of outstanding HTM securities was less than one year.
	There were no material gross unrealized holding gains or losses associated with investments in HTM securities at September 30, 2013 or December 31, 2012.

Debt_and_Credit_Facility

Debt and Credit Facility

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Debt and Credit Facility

9. Debt and Credit Facility

Available Credit Facility and Restricted Debt Covenants

Outstanding at September 30, 2013

Expiration Date

Total Credit Facility Capacity

Commercial

Available

Paper

Credit Facility

Capacity

(in millions)

Spectra Energy Partners, LP

2016

700

545.1

154.9

The issuances of commercial paper, letters of credit and revolving borrowings reduce the amount available under the credit facility.

On November 1, 2013, we amended and restated our credit agreement. The credit facility was increased to $2,000.0 million and expires in 2018.

The credit agreement contains various financial and other covenants, including the maintenance of a consolidated leverage ratio, as defined in the agreement. Failure to meet those covenants beyond applicable grace periods could result in accelerated due dates and/or termination of the agreement. As of September 30, 2013, we were in compliance with those covenants. In addition, the credit agreement allows for the acceleration of payments or termination of the agreement due to nonpayment, or in some cases, due to the acceleration of our other significant indebtedness or other significant indebtedness of some of our subsidiaries. The credit agreement does not contain provisions that trigger an acceleration of indebtedness based solely on the occurrence of an adverse change in our financial condition or results of operations.

As noted above, the terms of the credit agreement requires us to maintain a consolidated leverage ratio of adjusted consolidated indebtedness to adjusted consolidated earnings before interest, taxes, depreciation and amortization (EBITDA), as defined in the agreement, of 5.0 or less, provided that for three fiscal quarters subsequent to certain acquisitions (such as the November 1, 2013 U.S. assets dropdown from Spectra Energy Corp), the ratio may be 5.5 or less. As of September 30, 2013, the consolidated leverage ratio was 4.3 after giving effect to the impact of the dropdown.

Adjusted EBITDA is a non-GAAP measure. Our definition of Adjusted EBITDA may not be comparable to similarly titled measures of other companies because our definition excludes some, but not all, items that affect net income and is defined in varying ways by companies in our industry. Adjusted EBITDA should not be considered an alternative to net income, operating income, cash from operations or any other measure of financial performance or liquidity presented in accordance with GAAP.

Debt Issuance

On September 25, 2013, we issued $1,900.0 million aggregate principal amount of senior unsecured notes, comprised of $500.0 million of 2.95% senior notes due in 2018, $1,000.0 million of 4.75% senior notes due in 2024 and $400.0 million of 5.95% senior notes due in 2043. Net proceeds from the offering were used to pay a portion of the cash consideration for the U.S. assets acquisition from Spectra Energy which closed on November 1, 2013.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	10. Fair Value Measurements
	The following tables present, for each of the fair value hierarchy levels, assets that are measured at fair value on a recurring basis:



	Description	Condensed Consolidated		30-Sep-13
		Balance Sheet Caption		Total			Level 1			Level 2			Level 3
				(in millions)
	Commercial paper	Cash and cash equivalents		$	15.4		$	—		$	15.4		$	—

	Commercial paper	Investments and other assets - other investments-restricted funds		119.5			—			119.5			—

	Money market funds	Investments and other assets - other investments-restricted funds		1,883.30			1,883.30			—			—

	Total Assets			$	2,018.20		$	1,883.30		$	134.9		$	—




	Description	Condensed Consolidated		31-Dec-12
		Balance Sheet Caption		Total			Level 1			Level 2			Level 3
				(in millions)
	Money market funds	Cash and cash equivalents		$	15.7		$	—		$	15.7		$	—

	Commercial paper	Investments and other assets - other investments-restricted funds		140.7			—			140.7			—

	Total Assets			$	156.4		$	—		$	156.4		$	—

	Level 1
	Level 1 valuations represent quoted unadjusted prices for identical instruments in active markets.
	Level 2 Valuation Techniques
	Fair values of our financial instruments that are actively traded in the secondary market, including our long-term debt, are determined based on market-based prices. These valuations may include inputs such as quoted market prices of the exact or similar instruments, broker or dealer quotations, or alternative pricing sources that may include models or matrix pricing tools, with reasonable levels of price transparency.
	Level 3 Valuation Techniques
	Level 3 valuation techniques include the use of pricing models, discounted cash flow methodologies or similar techniques where at least one significant model assumption or input is unobservable. Level 3 financial instruments also include those for which the determination of fair value requires significant management judgment or estimation.
	Financial Instruments. The fair values of financial instruments that are recorded and carried at book value are summarized in the following table. Judgment is required in interpreting market data to develop the estimates of fair value. These estimates are not necessarily indicative of the amounts we could have realized in current markets.



			30-Sep-13						31-Dec-12
			Book			Approximate			Book			Approximate
			Value			Fair Value			Value			Fair Value
			(in millions)
	Long-term debt, including current maturities (a)		$	2,827.90		$	2,916.90		$	700		$	727.2



	(a)	Excludes unamortized items.
	The fair value of our long-term debt is determined based on market-based prices as described in the Level 2 valuation technique above.
	The fair value of cash and cash equivalents, accounts receivable, accounts payable, commercial paper, short-term money market securities and note payable—affiliates are not materially different from their carrying amounts because of the short-term nature of these instruments or because the stated rates approximate market rates.
	During 2013 and 2012, there were no material adjustments to assets and liabilities measured at fair value on a nonrecurring basis.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	11. Commitments and Contingencies
	Environmental. We are subject to various federal, state and local laws and regulations regarding air and water quality, hazardous and solid waste disposal and other environmental matters. These laws and regulations can change from time to time, imposing new obligations on us. We believe there are no matters outstanding that upon resolution will have an adverse effect on our consolidated results of operations, financial position or cash flows.
	Litigation. We are involved in legal, tax and regulatory proceedings in various forums arising in the ordinary course of business, including matters regarding contracts and payment claims, some of which may involve substantial monetary amounts. We have insurance coverage for certain of these losses should they be incurred. We believe that the final disposition of these proceedings will not have a material effect on our consolidated results of operations, financial position or cash flows.
	Legal costs related to the defense of loss contingencies are expensed as incurred. We had no material reserves recorded as of September 30, 2013 or December 31, 2012 related to litigation.

Risk_Management_and_Hedging_Ac

Risk Management and Hedging Activities	9 Months Ended
Risk Management and Hedging Activities	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Risk Management and Hedging Activities	'
	12. Risk Management and Hedging Activities
	We are exposed to the impact of changes in interest rates as a result of our issuance of variable and fixed-rate debt and commercial paper. We are exposed to minimal foreign currency risk from Express Canada operations. We employ established policies and procedures to manage our risks associated with these market fluctuations. As of September 30, 2013 and December 31, 2012, we did not have any derivatives outstanding.

Issuances_of_Common_Units

Issuances of Common Units	9 Months Ended
Issuances of Common Units	Sep. 30, 2013
Issuances of Common Units [Abstract]	'
Issuances of Common Units	'
	13. Issuances of Common Units
	In April 2013, we issued 5.2 million common units to the public representing limited partner interests and 0.1 million general partner units. The net proceeds from this offering were $193.3 million, after deducting underwriting discount and offering expenses. The net proceeds from this issuance may only be used to fund capital expenditures and acquisitions. Pending such use, the net proceeds of this offering will be held as cash or invested in short-term securities, or a combination of both.
	On August 2, 2013, we issued 7.1 million common units and 0.1 million general partner units to Spectra Energy in connection with the acquisition of Express-Platte, valued at $318.8 million. See Note 2 for further discussion of the acquisition of Express-Platte.

New_Accounting_Pronouncements

New Accounting Pronouncements	9 Months Ended
New Accounting Pronouncements	Sep. 30, 2013
Accounting Changes and Error Corrections [Abstract]	'
New Accounting Pronouncements	'
	14. New Accounting Pronouncements
	There were no significant accounting pronouncements adopted during the nine months ended September 30, 2013 that had a material impact on our consolidated results of operations, financial position or cash flows.

Subsequent_Events

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	15. Subsequent Events
	On November 1, 2013, we completed the closing of substantially all of the Dropdown Transactions. See Note 2 for additional information.
	On November 1, 2013, Spectra Energy Partners, LP entered into and borrowed $400.0 million under a senior unsecured five-year term loan agreement. A portion of the proceeds from the borrowing were used to pay Spectra Energy for the Dropdown Transactions.

Acquisitions_Acquisitions_Tabl

Acquisitions Acquisitions (Tables)	9 Months Ended
Acquisitions Acquisitions (Tables)	Sep. 30, 2013
Business Combinations [Abstract]	'
Preliminary Fair Values of the Assets And Liabilities	'
	The following table summarizes the preliminary fair values of the assets and liabilities as of March 14, 2013, the acquisition date of Express-Platte from third-parties by Spectra Energy. Subsequent adjustments may be recorded upon the completion of the valuation and the final determination of the purchase price allocation.



		Purchase Price
		Allocation
		(in millions)
	Cash	$	67.5
	Cash	$	67.5
	Receivables	21.3
	Receivables	21.3
	Other current assets	10.2
	Other current assets	10.2
	Goodwill	478.1
	Goodwill	478.1
	Property, plant and equipment	1,352.50
	Property, plant and equipment	1,352.50
	Accounts payable	(20.4		)
	Other current liabilities	(19.1		)
	Deferred credits and other liabilities	(327.1		)
	Long-term debt, including current portion	(241.9		)
	Total assets acquired/liabilities assumed	$	1,321.10
	Total assets acquired/liabilities assumed	$	1,321.10
Summarized Financial Information For Express US	'
	The following tables present summarized financial information for Express US, which is a VIE, on a 100%-consolidated basis since March 14, 2013, the acquisition date of Express US from third-parties by Spectra Energy.


		Three Months Ended			Nine Months Ended
		30-Sep-13			30-Sep-13
		(in millions)
	Operating revenues	$	61.1		$	131.7
	Operating revenues	$	61.1		$	131.7
	EBIT	29.4			63.6
	EBIT	29.4			63.6
	Net income	26.6			57.3
	Net income	26.6			57.3


		September 30,
		2013
		(in millions)
	Total current assets	$	75.1
	Total current assets	$	75.1
	Investments and other assets	431.6
	Investments and other assets	431.6
	Net property, plant and equipment	1,112.90
	Net property, plant and equipment	1,112.90
	Total Assets	1,619.60
	Total Assets	1,619.60
	Total current liabilities	55
	Total current liabilities	55
	Long-term debt	145.1
	Long-term debt	145.1
	Equity	1,419.50
	Equity	1,419.50
	Total Liabilities and Equity	$	1,619.60
	Total Liabilities and Equity	$	1,619.60
Pro Forma Results of Operations Information That Reflect the Acquisition of Express-Platte	'
	The following table presents pro forma results of operations information that reflect the acquisition of Express-Platte as if the acquisition had occurred as of January 1, 2012, adjusted for items that are directly attributable to the acquisition. This information has been compiled from current and historical financial statements, and is not necessarily indicative of the results that actually would have been achieved had the transaction occurred at the beginning of the periods presented or that may be achieved in the future.


		Three Months					Nine Months
		Ended September 30,					Ended September 30,
		2013			2012		2013		2012
		(in millions, except per-unit amounts)
	Operating revenues	$	133.1		$	129.5	$	395.1	$	373.2
	Operating revenues	$	133.1		$	129.5	$	395.1	$	373.2
	Earnings before income taxes	77.3			83.3		217.3		227.3
	Earnings before income taxes	77.3			83.3		217.3		227.3
	Net income	75.6			83		214.6		226.2
	Net income	75.6			83		214.6		226.2
	Net income-controlling interests	59.6			71		175.2		202.2
	Net income-controlling interests	59.6			71		175.2		202.2
	Net income per limited partner unit—basic and diluted	0.41			0.61		1.26		1.73
	Net income per limited partner unit—basic and diluted	0.41			0.61		1.26		1.73

Business_Segments_Tables

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Business Segment Data	'
	Business Segment Data



			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2013		2012		2013		2012
			(in millions)
	Operating revenues
	Gas Transportation and Storage		$	56.8	$	57.2	$	174.6	$	177.8

	Liquids		76.3		—		162.2		—

	Other		—		—		—		—

	Total operating revenues		$	133.1	$	57.2	$	336.8	$	177.8

	Segment EBIT
	Gas Transportation and Storage		$	29.8	$	29.6	$	94.4	$	97.9

	Liquids (a)		19.1		—		37.9		—

	Other		23.6		24.5		79.6		71.7

	Total EBIT		72.5		54.1		211.9		169.6

	Interest income and other (b)		18.2		—		38		—

	Interest expense		13.4		7.7		35.2		23.1

	Earnings before income taxes		$	77.3	$	46.4	$	214.7	$	146.5



	(a)	Presented net of EBIT's noncontrolling interests for Liquids.

	(b)	Includes foreign currency transaction gains and losses and the add-back of noncontrolling interests related to segment EBIT.
Reconciliation of Assets from Segment to Consolidated	'


			30-Sep-13		31-Dec-12
			(in millions)
	Segment Assets
	Gas Transportation and Storage		$	1,714.10	$	1,715.00

	Liquids		1,937.50		—

	Total reportable segments		3,651.60		1,715.00

	Other		2,929.40		1,090.70

	Total consolidated		$	6,581.00	$	2,805.70

Net_Income_Per_Limited_Partner1

Net Income Per Limited Partner Unit and Cash Distributions (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Net Income Per Limited Partner Unit Calculations	'
	The following table presents our net income per limited partner unit calculations:



		Three Months Ended							Nine Months Ended
		September 30,							September 30,
		2013				2012			2013		2012
		(in millions, except per unit amounts)
	Net income-controlling interests	$	59.6			$	46.1		$	177.6	$	145.4

	Less:
	General partner’s interest in net income—2%	1.2				0.9			3.6		2.9

	General partner’s interest in net income attributable to incentive distribution rights	10.6				6.4			27.6		17.7

	Limited partners’ interest in net income	$	47.8			$	38.8		$	146.4	$	124.8

	Weighted average limited partner units outstanding—basic and diluted	113.4				96.3			108.5		96.3

	Net income per limited partner unit—basic and diluted	$	0.42			$	0.4		$	1.35	$	1.3

Incentive Distribution Rights in Accordance with Partnership Agreement	'
	Incentive Distribution Rights. The general partner holds incentive distribution rights beyond the first target distribution in accordance with the partnership agreement as follows:



		Total Quarterly Distribution		Marginal Percentage
				Interest in Distributions
		Target Per-Unit Amount		Common			General
				Unitholders			Partner
	Minimum Quarterly Distribution	$0.30		98	%		2	%
	First Target Distribution	up to $0.345		98	%		2	%
	Second Target Distribution	above $0.345 up to $0.375		85	%		15	%
	Third Target Distribution	above $0.375 up to $0.45		75	%		25	%
	Thereafter	above $0.45		50	%		50	%

Investments_in_Unconsolidated_1

Investments in Unconsolidated Affiliates (Tables)	9 Months Ended
	Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Investments in Unconsolidated Affiliates	'
	Investments in Unconsolidated Affiliates



			September 30,		December 31,
			2013		2012
			(in millions)
	Gulfstream		$	331.2	$	345.5

	Market Hub		372.6		378.2

	M&N US		191		197.5

	Total		$	894.8	$	921.2

Equity in Earnings of Unconsolidated Affiliates	'
	Equity in Earnings of Unconsolidated Affiliates



			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2013		2012		2013		2012
			(in millions)
	Gulfstream		$	17.5	$	16.8	$	49.7	$	46.6

	Market Hub		6.5		9.6		21.6		31

	M&N US (a)		6.5		—		20.2		—

	Total		$	30.5	$	26.4	$	91.5	$	77.6



	(a)	We acquired a 38.76% interest of M&N US during the fourth quarter of 2012. The equity earnings related to the acquired interest was recorded prospectively from the date of the acquisition.
Summarized Statements of Operations Of Unconsolidated Affiliates Presented at 100 Percent	'
	Summarized Financial Information of Unconsolidated Affiliates (Presented at 100%)



			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2013		2012		2013		2012
			(in millions)
	Gulfstream
	Operating revenues		$	69.5	$	70.1	$	205.5	$	206.6

	Operating expenses		16.3		18.4		51.4		58.9

	Operating income		53.2		51.7		154.1		147.7

	Net income		35.7		34.3		101.5		95.1

	Market Hub
	Operating revenues		21.5		27.2		70.5		86.3

	Operating expenses		8.4		7.9		27.6		24.3

	Operating income		13.1		19.3		42.9		62

	Net income		13.1		19.1		43.2		62

	M&N US (a)
	Operating revenues		40.7		—		123.7		—

	Operating expenses		14.8		—		43.1		—

	Operating income		25.9		—		80.6		—

	Net income		16.6		—		52		—



	(a)	We acquired a 38.76% interest in M&N US in the fourth quarter of 2012. Summarized financial information is included for periods after date of acquisition.

Goodwill_Goodwill_Tables

Goodwill Goodwill (Tables)	9 Months Ended
	Sep. 30, 2013
Goodwill [Abstract]	'
Changes in Goodwill	'
	The following presents changes in goodwill during 2013:



		Goodwill
		(in millions)
	31-Dec-12	$	461.7

	Acquisition of interests in Express-Platte	478.1

	30-Sep-13	$	939.8

Marketable_Securities_and_Rest1

Marketable Securities and Restricted Funds (Tables)	9 Months Ended
	Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]	'
Estimated Fair Values of Available for Sale Securities	'
	AFS Securities. All of our AFS securities are restricted funds and are as follows:



		Estimated Fair Value

		September 30, 2013		December 31, 2012
		(in millions)
	Commercial paper	$	119.5	$	140.7

	Money market funds	1,883.30		—

	Total available-for-sale securities	$	2,002.80	$	140.7

Debt_and_Credit_Facility_Table

Debt and Credit Facility (Tables)

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Debt and Credit Facility Summary

Outstanding at September 30, 2013

Expiration Date

Total Credit Facility Capacity

Commercial

Available

Paper

Credit Facility

Capacity

(in millions)

Spectra Energy Partners, LP

2016

700

545.1

154.9

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Hierarchy Levels, Assets Measured at Fair Value on Recurring Basis	'
	The following tables present, for each of the fair value hierarchy levels, assets that are measured at fair value on a recurring basis:



	Description	Condensed Consolidated		30-Sep-13
		Balance Sheet Caption		Total			Level 1			Level 2			Level 3
				(in millions)
	Commercial paper	Cash and cash equivalents		$	15.4		$	—		$	15.4		$	—

	Commercial paper	Investments and other assets - other investments-restricted funds		119.5			—			119.5			—

	Money market funds	Investments and other assets - other investments-restricted funds		1,883.30			1,883.30			—			—

	Total Assets			$	2,018.20		$	1,883.30		$	134.9		$	—




	Description	Condensed Consolidated		31-Dec-12
		Balance Sheet Caption		Total			Level 1			Level 2			Level 3
				(in millions)
	Money market funds	Cash and cash equivalents		$	15.7		$	—		$	15.7		$	—

	Commercial paper	Investments and other assets - other investments-restricted funds		140.7			—			140.7			—

	Total Assets			$	156.4		$	—		$	156.4		$	—

Fair Values of Financial Instruments That are Recorded and Carried at Book Value	'
	The fair values of financial instruments that are recorded and carried at book value are summarized in the following table. Judgment is required in interpreting market data to develop the estimates of fair value. These estimates are not necessarily indicative of the amounts we could have realized in current markets.



			30-Sep-13						31-Dec-12
			Book			Approximate			Book			Approximate
			Value			Fair Value			Value			Fair Value
			(in millions)
	Long-term debt, including current maturities (a)		$	2,827.90		$	2,916.90		$	700		$	727.2



	(a)	Excludes unamortized items

General_Details

General (Details) (Express-Platte)	Sep. 30, 2013	Mar. 14, 2013	Nov. 01, 2013	Sep. 30, 2013	Mar. 14, 2013	Aug. 02, 2013	Aug. 02, 2013
			UNITED STATES	UNITED STATES	Spectra Energy	Spectra Energy Subsidiary	Spectra Energy Subsidiary
							UNITED STATES
Business Acquisition [Line Items]	'	'	'	'	'	'	'
Effective date of acquisition	'	'	1-Nov-13	'	14-Mar-13	2-Aug-13	'
Percentage of ownership interests acquired	60.00%	100.00%	60.00%	100.00%	'	100.00%	40.00%

Acquisitions_Additional_Inform

Acquisitions (Additional Information) (Details) (USD $)

Nov. 01, 2013

Sep. 30, 2013

Nov. 01, 2013

Dec. 31, 2012

Oct. 31, 2012

Nov. 01, 2013

Aug. 02, 2013

Sep. 30, 2013

Mar. 14, 2013

Sep. 30, 2013

Nov. 01, 2013

Sep. 30, 2013

Nov. 01, 2013

Mar. 14, 2013

Aug. 02, 2013

Nov. 01, 2013

In Millions, except Share data, unless otherwise specified

Sand Hills and Southern Hills Pipeline

Gulfstream

Southeast Supply Header

Steckman Ridge, LP

Market Hub

M&N US

U.S. Assets Acquisition

Express-Platte

Spectra Energy

Spectra Energy Subsidiary

Subsequent Event

Subordinated Notes 7.39% Due 2019

Subordinated Notes 6.09% Due 2020

UNITED STATES

Express-Platte

Spectra Energy

UNITED STATES

CANADA

U.S. Assets Acquisition

Business Acquisition [Line Items]

Effective date of acquisition

31-Oct-12

1-Nov-13

14-Mar-13

2-Aug-13

1-Nov-13

Percentage of ownership interests acquired

33.30%

1.00%

50.00%

49.90%

50.00%

38.77%

38.76%

60.00%

100.00%

60.00%

100.00%

40.00%

100.00%

Cash purchase price

$318.70

$2,300

$410.40

Total number of shares to be issued during dropdown

175,500,000

Partners units issued (in shares)

7,200,000

171,100,000

SEP units issued

56.2

318.8

Liabilities assumed during acquisition

2,400

Subordinated notes

227.9

117.9

110

Debt instrument maturity year

'2019

'2020

Debt instrument, interest rate, stated percentage

7.39%

6.09%

Debt outstanding

$429

$145.10

Acquisitions_Summary_of_Fair_V

Acquisitions Summary of Fair Values of Assets and Liabilities Acquired (Details) (Express-Platte, USD $)	Mar. 14, 2013
In Millions, unless otherwise specified	Mar. 14, 2013
Express-Platte	'
Business Acquisition [Line Items]	'
Cash	$67.50
Receivables	21.3
Other current assets	10.2
Goodwill	478.1
Property, plant and equipment	1,352.50
Accounts payable	-20.4
Other current liabilities	-19.1
Deferred credits and other liabilities	-327.1
Long-term debt, including current portion	-241.9
Total assets acquired/liabilities assumed	$1,321.10

Acquisitions_Summarized_Result

Acquisitions Summarized Results of Operations Information for Express US (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition [Line Items]	'	'	'	'
Operating revenues	$133.10	$57.20	$336.80	$177.80
Earnings before interest and income tax	72.5	54.1	211.9	169.6
Net income	75.6	46.1	212	145.4
Express-Platte \| UNITED STATES	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Operating revenues	61.1	'	131.7	'
Earnings before interest and income tax	29.4	'	63.6	'
Net income	$26.60	'	$57.30	'

Acquisitions_Summarized_Balanc

Acquisitions Summarized Balance Sheet Information for Express US (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Business Acquisition [Line Items]	'	'	'	'
Total current assets	$172.80	$55.30	'	'
Investments and other assets	3,837.40	1,524.30	'	'
Net property, plant and equipment	2,547.70	1,206.30	'	'
Regulatory Assets and Deferred Debits	23.1	19.8	'	'
Total Assets	6,581	2,805.70	'	'
Total current liabilities	695.8	386.1	'	'
Deferred credits and other liabilities	51.6	14.4	'	'
Equity	3,047.50	1,705.60	1,684.90	1,697.70
Total Liabilities and Equity	6,581	2,805.70	'	'
Express-Platte \| UNITED STATES	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Total current assets	75.1	'	'	'
Investments and other assets	431.6	'	'	'
Net property, plant and equipment	1,112.90	'	'	'
Total Assets	1,619.60	'	'	'
Total current liabilities	55	'	'	'
Long-term debt, including current portion	145.1	'	'	'
Equity	1,419.50	'	'	'
Total Liabilities and Equity	$1,619.60	'	'	'

Acquisitions_Pro_Forma_Results

Acquisitions Pro Forma Results of Operations (Details) (Express-Platte, USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Express-Platte	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Operating revenues	$133.10	$129.50	$395.10	$373.20
Earnings before income taxes	77.3	83.3	217.3	227.3
Net income	75.6	83	214.6	226.2
Net income-controlling interests	$59.60	$71	$175.20	$202.20
Net income per limited partner unit-basic and diluted	0.41	0.61	1.26	1.73

Business_Segments_Additional_I

Business Segments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013
	reportable_segements
Segment Reporting Information [Line Items]	'
Number of reportable segments	2
Market Hub	'
Segment Reporting Information [Line Items]	'
Number of natural gas storage facilities	2

Business_Segment_Data_Detail

Business Segment Data (Detail) (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Segment Reporting Information [Line Items]	'		'	'		'
Operating revenues	$133.10		$57.20	$336.80		$177.80
Earnings before interest and income tax	72.5		54.1	211.9		169.6
Interest income	18.2	[1]	'	38	[1]	'
Interest expense	13.4		7.7	35.2		23.1
Earnings Before Income Taxes	77.3		46.4	214.7		146.5
Gas Transportation and Storage	'		'	'		'
Segment Reporting Information [Line Items]	'		'	'		'
Operating revenues	56.8		57.2	174.6		177.8
Earnings before interest and income tax	29.8		29.6	94.4		97.9
Liquids	'		'	'		'
Segment Reporting Information [Line Items]	'		'	'		'
Operating revenues	76.3		'	162.2		'
Earnings before interest and income tax	19.1	[2]	'	37.9	[2]	'
Other	'		'	'		'
Segment Reporting Information [Line Items]	'		'	'		'
Earnings before interest and income tax	$23.60		$24.50	$79.60		$71.70

[1]	Includes foreign currency transaction gains and losses and the add-back of noncontrolling interests related to segment EBIT.
[2]	Presented net of EBIT's noncontrolling interests for Liquids.

Business_Segments_Business_Seg

Business Segments Business Segment Data - Segment Assets (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]	'	'
Assets	$6,581	$2,805.70
Total reportable segments	'	'
Segment Reporting Information [Line Items]	'	'
Assets	3,651.60	1,715
Gas Transportation and Storage	'	'
Segment Reporting Information [Line Items]	'	'
Assets	1,714.10	1,715
Liquids	'	'
Segment Reporting Information [Line Items]	'	'
Assets	1,937.50	'
Other	'	'
Segment Reporting Information [Line Items]	'	'
Assets	$2,929.40	$1,090.70

Net_Income_Per_Limited_Partner2

Net Income Per Limited Partner Unit and Cash Distributions (Additional Information) (Details) (USD $)	9 Months Ended	1 Months Ended
	Sep. 30, 2013	Nov. 07, 2013
	Sep. 30, 2013	Subsequent Event
Equity [Abstract]	'	'
Period after the end of each quarter for the distribution of available cash to unit holders on the applicable record date	'60 days	'
Subsequent Event [Line Items]	'	'
Distributions to be paid to unit holders	'	$0.52
Distribution to limited partner, declaration date	17-Oct-13	'
Distribution to limited partner, payment date	14-Nov-13	'
Dividend record date	31-Oct-13	'

Net_Income_Per_Limited_Partner3

Net Income Per Limited Partner Unit and Cash Distributions (Net Income Per Limited Partner Unit Calculations) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity [Abstract]	'	'	'	'
General partner's interest in net income, ownership interest percentage	2.00%	2.00%	2.00%	2.00%
Earnings Per Unit [Line Items]	'	'	'	'
Net income	$59.60	$46.10	$177.60	$145.40
Less: General partner's interest in net income	11.8	7.3	31.2	20.6
Limited partners' interest in net income	47.8	38.8	146.4	124.8
Weighted-average limited partner units outstanding - basic and diluted (in units)	113.4	96.3	108.5	96.3
Net income per limited partner unit-basic and diluted (in dollars per share)	0.42	0.4	1.35	1.3
Partnership Interest	'	'	'	'
Earnings Per Unit [Line Items]	'	'	'	'
Less: General partner's interest in net income	1.2	0.9	3.6	2.9
Incentive Distribution Rights	'	'	'	'
Earnings Per Unit [Line Items]	'	'	'	'
Less: General partner's interest in net income	$10.60	$6.40	$27.60	$17.70

Net_Income_Per_Limited_Partner4

Net Income Per Limited Partner Unit and Cash Distributions (Incentive Distribution Rights in Accordance with Partnership Agreement) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013
Minimum Quarterly Distribution	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Marginal Percentage Interest in Distributions Common Unitholders	98.00%
Marginal Percentage Interest in Distributions General Partner	2.00%
First Target Distribution	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Marginal Percentage Interest in Distributions Common Unitholders	98.00%
Marginal Percentage Interest in Distributions General Partner	2.00%
Second Target Distribution	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Marginal Percentage Interest in Distributions Common Unitholders	85.00%
Marginal Percentage Interest in Distributions General Partner	15.00%
Third Target Distribution	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Marginal Percentage Interest in Distributions Common Unitholders	75.00%
Marginal Percentage Interest in Distributions General Partner	25.00%
Target Distribution Thereafter	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Marginal Percentage Interest in Distributions Common Unitholders	50.00%
Marginal Percentage Interest in Distributions General Partner	50.00%
Minimum \| Minimum Quarterly Distribution	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Total Quarterly Distribution Target Per-Unit Amount (in dollars per share)	0.3
Minimum \| Second Target Distribution	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Total Quarterly Distribution Target Per-Unit Amount (in dollars per share)	0.345
Minimum \| Third Target Distribution	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Total Quarterly Distribution Target Per-Unit Amount (in dollars per share)	0.375
Minimum \| Target Distribution Thereafter	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Total Quarterly Distribution Target Per-Unit Amount (in dollars per share)	0.45
Maximum \| First Target Distribution	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Total Quarterly Distribution Target Per-Unit Amount (in dollars per share)	0.345
Maximum \| Second Target Distribution	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Total Quarterly Distribution Target Per-Unit Amount (in dollars per share)	0.375
Maximum \| Third Target Distribution	'
Incentive Distribution Made to Managing Member or General Partner [Line Items]	'
Total Quarterly Distribution Target Per-Unit Amount (in dollars per share)	0.45

Investments_in_Unconsolidated_2

Investments in Unconsolidated Affiliates (Additional Information) (Details) (USD $)	9 Months Ended					9 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Nov. 01, 2013	Sep. 30, 2013	Sep. 30, 2012	Nov. 01, 2013	Sep. 30, 2013	Dec. 31, 2012
	Sep. 30, 2013	Sep. 30, 2012	Gulfstream	Gulfstream	Gulfstream	Market Hub	Market Hub	Market Hub	M&N US	M&N US
Schedule of Equity Method Investments [Line Items]	'	'	'	'	'	'	'	'	'	'
Percentage of investments in unconsolidated affiliates which are accounted for using the equity method	'	'	49.00%	'	'	50.00%	'	'	38.76%	'
Distributions received from unconsolidated affiliates	'	'	$63.50	$57.10	'	'	'	'	$23.80	'
Operating Activities-Distributions received from unconsolidated affiliates	98.6	80.7	49.7	45.9	'	28.7	34.8	'	20.2	'
Investing Activities-Distributions received from unconsolidated affiliates	$17.40	$11.20	$13.80	$11.20	'	'	'	'	$3.60	'
Percentage of ownership interests acquired	'	'	'	'	1.00%	'	'	50.00%	'	38.76%

Investments_in_Unconsolidated_3

Investments in Unconsolidated Affiliates (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]	'	'
Investments in unconsolidated affiliates	$894.80	$921.20
Gulfstream	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Investments in unconsolidated affiliates	331.2	345.5
Market Hub	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Investments in unconsolidated affiliates	372.6	378.2
M&N US	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Investments in unconsolidated affiliates	$191	$197.50

Investments_in_Unconsolidated_4

Investments in Unconsolidated Affiliates (Equity in Earnings of Unconsolidated Affiliates) (Details) (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Schedule of Equity Method Investments [Line Items]	'		'	'		'
Equity in earnings of unconsolidated affiliates	$30.50		$26.40	$91.50		$77.60
Gulfstream	'		'	'		'
Schedule of Equity Method Investments [Line Items]	'		'	'		'
Equity in earnings of unconsolidated affiliates	17.5		16.8	49.7		46.6
Percentage of investments in unconsolidated affiliates which are accounted for using the equity method	49.00%		'	49.00%		'
Market Hub	'		'	'		'
Schedule of Equity Method Investments [Line Items]	'		'	'		'
Equity in earnings of unconsolidated affiliates	6.5		9.6	21.6		31
Percentage of investments in unconsolidated affiliates which are accounted for using the equity method	50.00%		'	50.00%		'
M&N US	'		'	'		'
Schedule of Equity Method Investments [Line Items]	'		'	'		'
Equity in earnings of unconsolidated affiliates	$6.50	[1]	'	$20.20	[1]	'
Percentage of investments in unconsolidated affiliates which are accounted for using the equity method	38.76%		'	38.76%		'

[1]	We acquiredB a 38.76% interest of M&N USB during the fourth quarter of 2012. The equity earnings related to the acquired interest was recorded prospectively from the date of the acquisition.

Investments_in_Unconsolidated_5

Investments in Unconsolidated Affiliates (Summarized Statements of Operations of Unconsolidated Affiliates) (Details) (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Related Party Transaction [Line Items]	'		'	'		'
Operating revenues	$133.10		$57.20	$336.80		$177.80
Operating expenses	74		29.5	179.3		85.9
Operating income	59.1		27.7	157.5		91.9
Net income	59.6		46.1	177.6		145.4
Gulfstream	'		'	'		'
Related Party Transaction [Line Items]	'		'	'		'
Percentage of investments in unconsolidated affiliates which are accounted for using the equity method	49.00%		'	49.00%		'
Gulfstream \| Unconsolidated Affiliates	'		'	'		'
Related Party Transaction [Line Items]	'		'	'		'
Operating revenues	69.5		70.1	205.5		206.6
Operating expenses	16.3		18.4	51.4		58.9
Operating income	53.2		51.7	154.1		147.7
Net income	35.7		34.3	101.5		95.1
Market Hub	'		'	'		'
Related Party Transaction [Line Items]	'		'	'		'
Percentage of investments in unconsolidated affiliates which are accounted for using the equity method	50.00%		'	50.00%		'
Market Hub \| Unconsolidated Affiliates	'		'	'		'
Related Party Transaction [Line Items]	'		'	'		'
Operating revenues	21.5		27.2	70.5		86.3
Operating expenses	8.4		7.9	27.6		24.3
Operating income	13.1		19.3	42.9		62
Net income	13.1		19.1	43.2		62
M&N US	'		'	'		'
Related Party Transaction [Line Items]	'		'	'		'
Percentage of investments in unconsolidated affiliates which are accounted for using the equity method	38.76%		'	38.76%		'
M&N US \| Unconsolidated Affiliates	'		'	'		'
Related Party Transaction [Line Items]	'		'	'		'
Operating revenues	40.7	[1]	'	123.7	[1]	'
Operating expenses	14.8	[1]	'	43.1	[1]	'
Operating income	25.9	[1]	'	80.6	[1]	'
Net income	$16.60	[1]	'	$52	[1]	'

[1]	We acquired a 38.76% interest in M&N US in the fourth quarter of 2012. Summarized financial information is included for periods after date of acquisition.

Goodwill_Details

Goodwill (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Goodwill [Abstract]	'
31-Dec-12	$461.70
Acquired goodwill of Express-Platte	478.1
30-Sep-13	$939.80

Marketable_Securities_and_Rest2

Marketable Securities and Restricted Funds (Additional Information) (Details) (USD $)	Sep. 30, 2013	Sep. 25, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
In Millions, unless otherwise specified				Commercial Paper	Commercial Paper	Money Market Funds	Money Market Funds	Money Market Funds	Available-for-sale	Held-to-maturity
								Other Investments	Maximum	Maximum
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'	'	'	'	'	'	'
Unsecured senior notes issued	'	$1,900	'	'	'	'	'	'	'	'
Weighted-average contractual maturity of outstanding securities	'	'	'	'	'	'	'	'	'1 year	'1 year
Held-to-maturity securities	'	'	'	'	'	'	'	10.3	'	'
Available for sale securities marketable securities	$2,002.80	'	$140.70	$119.50	$140.70	$1,883.30	$0	'	'	'

Debt_and_Credit_Facility_Addit

Debt and Credit Facility (Additional Information) (Details) (USD $)	Nov. 01, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Nov. 01, 2013	Sep. 30, 2013	Dec. 31, 2012
Line of Credit Facility [Line Items]	'	'	'
Expiration Date	'	'2016	'
Total Credit Facility Capacity	$2,000	$700	'
Commercial Paper, Outstanding	'	545.1	336.4
Available Credit Facility Capacity	'	$154.90	'
Debt-to-Adjusted EBITDA ratio	'	4.3	'
Temporary Maximum	'	'	'
Line of Credit Facility [Line Items]	'	'	'
Debt-to-Adjusted EBITDA ratio	5.5	'	'
Maximum	'	'	'
Line of Credit Facility [Line Items]	'	'	'
Debt-to-Adjusted EBITDA ratio	'	5	'

Debt_and_Credit_Facility_Debt_

Debt and Credit Facility Debt and Credit Facility - Debt Issuance (Details) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Nov. 01, 2013	Sep. 25, 2013
Debt Instrument [Line Items]	'	'
Debt instrument, issuance date	1-Nov-13	25-Sep-13
Unsecured senior notes issued	'	$1,900
Senior Notes 2.95% Due 2018	'	'
Debt Instrument [Line Items]	'	'
Unsecured senior notes issued	'	500
Debt instrument, interest rate, stated percentage	'	2.95%
Debt instrument maturity year	'	'2018
Senior Notes 4.75% Due 2024	'	'
Debt Instrument [Line Items]	'	'
Unsecured senior notes issued	'	1,000
Debt instrument, interest rate, stated percentage	'	4.75%
Debt instrument maturity year	'	'2024
Senior Notes 5.95% Due 2043	'	'
Debt Instrument [Line Items]	'	'
Unsecured senior notes issued	400	$400
Debt instrument, interest rate, stated percentage	'	5.95%
Debt instrument maturity year	'	'2043

Fair_Value_Measurements_Fair_V

Fair Value Measurements (Fair Value Hierarchy Levels, Assets Measured at Fair Value on Recurring Basis) (Details) (Fair Value, Measurements, Recurring, USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Fair value assets	$2,018.20	$156.40
Commercial Paper \| Cash and Cash Equivalents	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Fair value assets	15.4	'
Commercial Paper \| Other Investments-Restricted Cash	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Fair value assets	119.5	140.7
Money Market Securities \| Cash and Cash Equivalents	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Fair value assets	'	15.7
Money Market Securities \| Other Investments-Restricted Cash	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Fair value assets	1,883.30	'
Level 1	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Fair value assets	1,883.30	'
Level 1 \| Money Market Securities \| Other Investments-Restricted Cash	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Fair value assets	1,883.30	'
Level 2	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Fair value assets	134.9	156.4
Level 2 \| Commercial Paper \| Cash and Cash Equivalents	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Fair value assets	15.4	'
Level 2 \| Commercial Paper \| Other Investments-Restricted Cash	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Fair value assets	119.5	140.7
Level 2 \| Money Market Securities \| Cash and Cash Equivalents	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Fair value assets	'	$15.70

Fair_Value_Measurements_Fair_V1

Fair Value Measurements (Fair Values of Financial Istruments Recorded and Carried at Book Value) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Long-term debt	$2,786.10		$699.60
Book Value	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Long-term debt	2,827.90	[1]	700	[1]
Approximate Fair Value	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Long-term debt	$2,916.90	[1]	$727.20	[1]

[1]	Excludes unamortized items

Issuances_of_Common_Units_Deta

Issuances of Common Units (Details) (USD $)	1 Months Ended	9 Months Ended		1 Months Ended		0 Months Ended
In Millions, except Share data, unless otherwise specified	Apr. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Apr. 30, 2013	Apr. 30, 2013	Aug. 02, 2013	Aug. 02, 2013	Aug. 02, 2013
				Limited Partners Common	General Partner	Express-Platte	Express-Platte	Express-Platte
							Limited Partners Common	General Partner
Issuances of Common Units [Line Items]	'	'	'	'	'	'	'	'
Unit issuance date	'2013-04	'	'	'	'	'2013-08	'	'
Partners units issued (in shares)	'	'	'	5,200,000	100,000	'	'	'
Net proceeds from issuance of common units	$193.30	$193.30	$0	'	'	'	'	'
Partners units issued (in shares)	'	'	'	'	'	7,200,000	7.1	0.1
SEP units issued	'	'	'	'	'	$318.80	'	'

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	0 Months Ended				9 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Nov. 01, 2013	Sep. 25, 2013	Nov. 01, 2013	Nov. 01, 2013	Sep. 30, 2013	Mar. 14, 2013	Aug. 02, 2013	Nov. 01, 2013	Nov. 01, 2013	Sep. 25, 2013
			U.S. Assets Acquisition	Express-Platte	M&N US	Spectra Energy	Spectra Energy Subsidiary	Subsequent Event	Senior Notes 5.95% Due 2043	Senior Notes 5.95% Due 2043
				UNITED STATES		Express-Platte	Express-Platte	Spectra Energy
								U.S. Assets Acquisition
Subsequent Event [Line Items]	'	'	'	'	'	'	'	'	'	'
Effective date of acquisition	'	'	1-Nov-13	1-Nov-13	31-Oct-12	14-Mar-13	2-Aug-13	1-Nov-13	'	'
Debt instrument, issuance date	1-Nov-13	25-Sep-13	'	'	'	'	'	'	'	'
Unsecured senior notes issued	'	$1,900	'	'	'	'	'	'	$400	$400
Debt Instrument, Term Loan Agreement	'5 years	'	'	'	'	'	'	'	'	'