Spectra Energy 10-Q 3 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	9 Months Ended
	Sep. 30, 2016shares
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Trading Symbol	SE
Entity Registrant Name	SPECTRA ENERGY CORP.
Entity Central Index Key	1,373,835
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	701,483,324

Condensed Consolidated Statemen

Condensed Consolidated Statement of Operations Statement - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating Revenues
Transportation, storage and processing of natural gas		$ 792	$ 781	$ 2,426	$ 2,425
Distribution of natural gas		153	160	792	1,005
Sales of natural gas liquids		15	41	68	138
Transportation of crude oil		89	93	262	267
Other		26	28	70	83
Total operating revenues		1,075	1,103	3,618	3,918
Operating Expenses
Natural gas and petroleum products purchased		50	76	401	627
Operating, maintenance and other		425	364	1,158	1,107
Depreciation and amortization		193	188	582	574
Property and other taxes		86	86	291	274
Total operating expenses		754	714	2,432	2,582
Operating Income		321	389	1,186	1,336
Other Income and Expenses
Earnings (loss) from equity investments		51	48	100	(117)
Other income and expenses, net		52	31	123	73
Total other income and expenses		103	79	223	(44)
Interest Expense		133	155	437	480
Earnings Before Income Taxes		291	313	972	812
Income Tax Expense		10	70	160	164
Net Income		281	243	812	648
Net Income—Noncontrolling Interests		86	69	234	189
Net Income—Controlling Interests		$ 195	$ 174	$ 578	$ 459
Weighted-average shares outstanding
Basic		701	671	692	671
Diluted		703	672	693	672
Earnings per share
Basic	[1]	$ 0.28	$ 0.26	$ 0.84	$ 0.68
Diluted	[1]	0.28	0.26	0.83	0.68
Dividends per share		$ 0.405	$ 0.37	$ 1.215	$ 1.11
[1]	Quarterly earnings per share amounts are stand-alone calculations and may not be additive to full-year amounts due to rounding.

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Income	$ 281	$ 243	$ 812	$ 648
Other comprehensive income (loss):
Foreign currency translation adjustments	(78)	(350)	273	(755)
Pension and benefits impact (net of taxes of $2, $3, $6 and $8, respectively)	5	6	14	19
Other	(2)	1	0	1
Total other comprehensive income (loss)	(75)	(343)	287	(735)
Total Comprehensive Income (Loss), net of tax	206	(100)	1,099	(87)
Less: Comprehensive Income—Noncontrolling Interests	84	64	239	178
Comprehensive Income (Loss)—Controlling Interests	$ 122	$ (164)	$ 860	$ (265)

Condensed Consolidated Stateme4

Condensed Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Tax benefit (expense) on pension and benefits impact	$ (2)	$ (3)	$ (6)	$ (8)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents	$ 464	$ 213
Receivables, net	712	806
Inventory	287	307
Fuel tracker	19	41
Other	268	281
Total current assets	1,750	1,648
Investments and Other Assets
Investments in and loans to unconsolidated affiliates	2,742	2,592
Goodwill	4,203	4,154
Other	401	310
Total investments and other assets	7,346	7,056
Property, Plant and Equipment
Cost	32,736	29,843
Less accumulated depreciation and amortization	7,399	6,925
Net property, plant and equipment	25,337	22,918
Regulatory Assets and Deferred Debits	1,504	1,301
Total Assets	35,937	32,923
Current Liabilities
Accounts payable	736	511
Commercial paper	1,637	1,112
Taxes accrued	73	78
Interest accrued	140	179
Current maturities of long-term debt	467	652
Other	634	860
Total current liabilities	3,687	3,392
Long-term Debt	13,094	12,892
Deferred Credits and Other Liabilities
Deferred income taxes	5,758	5,445
Regulatory and other	1,417	1,323
Total deferred credits and other liabilities	7,175	6,768
Commitments and Contingencies
Preferred Stock of Subsidiaries	562	339
Equity
Preferred stock, $0.001 par, 22 million shares authorized, no shares outstanding	0	0
Common stock, $0.001 par, 1 billion shares authorized, 701 million and 671 million shares outstanding at September 30, 2016 and December 31, 2015, respectively	1	1
Additional paid-in capital	5,977	5,053
Retained earnings	1,477	1,741
Accumulated other comprehensive income (loss)	13	(269)
Total controlling interests	7,468	6,526
Noncontrolling interests	3,951	3,006
Total equity	11,419	9,532
Total Liabilities and Equity	$ 35,937	$ 32,923

Condensed Consolidated Balance6

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2016	Dec. 31, 2015
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	22,000,000	22,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares outstanding	701,000,000	671,000,000

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 812	$ 648
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	599	584
Deferred income tax expense	143	78
(Earnings) loss from equity investments	(100)	117
Distributions from equity investments	88	145
Other	57	251
Net cash provided by (used in) operating activities	1,599	1,823
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(2,407)	(1,817)
Investments in and loans to unconsolidated affiliates	(181)	(91)
Purchase of intangible, net	(80)	0
Disposition	204	0
Purchases of held-to-maturity securities	(479)	(463)
Proceeds from sales and maturities of held-to-maturity securities	475	457
Purchases of available-for-sale securities	(565)	0
Proceeds from sales and maturities of available-for-sale securities	559	1
Distributions from equity investments	45	441
Distribution to equity investment	(148)	0
Other changes in restricted funds	(19)	(24)
Other	1	(7)
Net cash provided by (used in) investing activities	(2,595)	(1,503)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	382	1,332
Payments for the redemption of long-term debt	(619)	(153)
Net increase (decrease) in commercial paper	502	(984)
Distributions to noncontrolling interests	(176)	(140)
Contributions from noncontrolling interests	437	164
Proceeds from the issuances of Spectra Energy common stock	878	0
Proceeds from the issuances of Spectra Energy Partners, LP common units	473	351
Proceeds from the issuance of Westcoast Energy Inc. preferred stock	229	0
Dividends paid on common stock	(842)	(747)
Other	(20)	(14)
Net cash provided by (used in) financing activities	1,244	(191)
Effect of exchange rate changes on cash	3	(6)
Net increase in cash and cash equivalents	251	123
Cash and cash equivalents at beginning of period	213	215
Cash and cash equivalents at end of period	464	338
Supplemental Disclosures
Property, plant and equipment non-cash accruals	$ 374	$ 276

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss) Foreign Currency Translation Adjustments	Accumulated Other Comprehensive Income (Loss) Other	Noncontrolling Interests
Beginning Balance at Dec. 31, 2014	$ 10,398	$ 1	$ 4,956	$ 2,541	$ 1,016	$ (354)	$ 2,238
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	648			459			189
Other comprehensive income (loss)	(735)				(744)	20	(11)
Dividends on common stock	(747)			(747)
Stock-based compensation	14		14
Distributions to noncontrolling interests	(142)						(142)
Contributions from noncontrolling interests	164						164
Spectra Energy common stock issued	2		2
Spectra Energy Partners, LP common units issued	330		49				281
Other, net	(1)		3				(4)
Ending Balance at Sep. 30, 2015	9,931	1	5,024	2,253	272	(334)	2,715
Beginning Balance at Dec. 31, 2015	9,532	1	5,053	1,741	79	(348)	3,006
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	812			578			234
Other comprehensive income (loss)	287				268	14	5
Dividends on common stock	(842)			(842)
Stock-based compensation	20		20
Distributions to noncontrolling interests	(180)						(180)
Contributions from noncontrolling interests	437						437
Spectra Energy common stock issued	878		878
Spectra Energy Partners, LP common units issued	457		25				432
Other, net	18		1				17
Ending Balance at Sep. 30, 2016	$ 11,419	$ 1	$ 5,977	$ 1,477	$ 347	$ (334)	$ 3,951

General

General	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General The terms “we,” “our,” “us” and “Spectra Energy” as used in this report refer collectively to Spectra Energy Corp 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. The term “Spectra Energy Partners” refers to our Spectra Energy Partners operating segment. The term “SEP” refers to Spectra Energy Partners, LP, our master limited partnership. On September 6, 2016, we announced that we entered into a definitive merger agreement with Enbridge Inc. (Enbridge) under which Enbridge and Spectra Energy will combine in a stock-for-stock merger transaction, which values Spectra Energy’s stock at approximately $28 billion , based on the closing price of Enbridge’s common shares as of September 2, 2016 . This transaction was unanimously approved by the boards of directors of both Spectra Energy and Enbridge and is expected to close in the first quarter of 2017, subject to shareholder and certain regulatory approvals and other customary conditions. Upon completion of the proposed merger, Spectra Energy shareholders will receive 0.984 Enbridge common shares for each share of Spectra Energy stock they own. The consideration to be received by Spectra Energy shareholders is valued at $40.33 per Spectra Energy share, based on the closing price of Enbridge common shares as of September 2, 2016 , representing an approximate 11.5% premium to the closing price of Spectra Energy stock as of September 2, 2016 . Upon completion of the merger, Enbridge shareholders are expected to own approximately 57% of the combined company and Spectra Energy shareholders are expected to own approximately 43% . Nature of Operations. Spectra Energy Corp, through its subsidiaries and equity affiliates, owns and operates a large and diversified portfolio of complementary natural gas-related energy assets, and owns and operates a crude oil pipeline system that connects Canadian and United States (U.S.) producers to refineries in the U.S. Rocky Mountain and Midwest regions. We currently operate in three key areas of the natural gas industry: gathering and processing, transmission and storage, and distribution. We provide transmission and storage of natural gas to customers in various regions of the northeastern and southeastern U.S., the Maritime Provinces in Canada, the Pacific Northwest in the U.S. and Canada, and in the province of Ontario, Canada. We also provide natural gas sales and distribution services to retail customers in Ontario, and natural gas gathering and processing services to customers in western Canada. We also own a 50% interest in DCP Midstream, LLC (DCP Midstream), based in Denver, Colorado, one of the leading natural gas gatherers in the U.S. and one of the largest U.S. producers and marketers of natural gas liquids (NGLs). Basis of Presentation. The accompanying Condensed Consolidated Financial Statements include our accounts and the accounts of our majority-owned 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, 2015 , 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 due to the effects of seasonal temperature variations on energy consumption, primarily in our gas distribution operations, as well as changing commodity prices on certain of our processing operations and other factors. Use of Estimates. To conform with generally accepted accounting principles (GAAP) in the U.S., 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.

Dispositions

Dispositions	9 Months Ended
	Sep. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure	Disposition On August 4, 2016, Westcoast Energy Inc. (Westcoast) completed the sale of its ownership interests in the Empress NGL operations (Empress) to Plains Midstream Canada ULC. Consideration received by Westcoast in this transaction was approximately $204 million in cash, including approximately $51 million for inventory and working capital. The total consideration is subject to final working capital adjustments, which are expected to be completed in the fourth quarter of 2016. The sale resulted in a pre-tax loss of less than $1 million and a tax benefit of $27 million , which are reflected in Operating, Maintenance and Other and Income Tax Expense, respectively, on our Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2016.

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Business Segment Data	Business Segments We manage our business in four reportable segments: Spectra Energy Partners, Distribution, Western Canada Transmission & Processing and Field Services. The remainder of our business operations is presented as “Other,” and consists of unallocated corporate costs and employee benefit plan assets and liabilities, 100%-owned captive insurance subsidiaries and other miscellaneous activities. Our chief operating decision maker (CODM) regularly reviews financial information about each of these segments in deciding how to allocate resources and evaluate performance. There is no aggregation within our reportable business segments. Spectra Energy’s presentation of its Spectra Energy Partners segment is reflective of the parent-level focus by our CODM, considering the resource allocation and governance provisions associated with SEP’s master limited partnership structure. SEP maintains a capital and cash management structure that is separate from Spectra Energy’s, is self-funding and maintains its own lines of bank credit and cash management accounts. From a Spectra Energy perspective, our CODM evaluates the Spectra Energy Partners segment as a whole, without regard to any of SEP’s individual businesses. Spectra Energy Partners provides transmission, storage and gathering of natural gas, as well as the transportation of crude oil through interstate pipeline systems for customers in various regions of the midwestern, northeastern and southern U.S. and Canada. The natural gas transmission and storage operations are primarily subject to the rules and regulations of the Federal Energy Regulatory Commission (FERC). The crude oil transportation operations are primarily subject to regulation by the FERC in the U.S. and the National Energy Board (NEB) in Canada. Our Spectra Energy Partners segment is composed of the operations of SEP, less governance costs, which are included in “Other.” Distribution provides retail natural gas distribution service in Ontario, Canada, as well as natural gas transmission and storage services to other utilities and energy market participants. These services are provided by Union Gas Limited (Union Gas), and are primarily subject to the rules and regulations of the Ontario Energy Board (OEB). Western Canada Transmission & Processing provides transmission of natural gas and natural gas gathering and processing services to customers in western Canada, the northern tier of the U.S. and the Maritime Provinces in Canada. This segment conducts business mostly through BC Pipeline, BC Field Services, Canadian Midstream and Maritimes & Northeast Pipeline Limited Partnership (M&N Canada). BC Pipeline, BC Field Services and M&N Canada operations are primarily subject to the rules and regulations of the NEB. See Note 2 for discussion related to the sale of Empress on August 4, 2016. Field Services gathers, compresses, treats, processes, transports, stores and sells natural gas, produces, fractionates, transports, stores and sells NGLs, recovers and sells condensate, and trades and markets natural gas and NGLs. It conducts operations through DCP Midstream, which is owned 50% by us and 50% by Phillips 66. DCP Midstream gathers raw natural gas through gathering systems connecting to several interstate and intrastate natural gas and NGL pipeline systems, one natural gas storage facility and one NGL storage facility. DCP Midstream operates in a diverse number of regions, including the Permian Basin, Eagle Ford, Niobrara/DJ Basin and the Midcontinent. DCP Midstream Partners, LP (DCP Partners) is a publicly traded master limited partnership, of which DCP Midstream acts as general partner. As of September 30, 2016 , DCP Midstream had an approximate 21% ownership interest in DCP Partners, including DCP Midstream’s limited partner and general partner interests. Our reportable segments offer different products and services and are managed separately as business units. Management evaluates segment performance based on earnings before interest, taxes and depreciation and amortization (EBITDA). Cash, cash equivalents and short-term investments are managed at the parent-company levels, so the associated gains and losses from foreign currency transactions and interest and dividend income are excluded from the segments’ EBITDA. Our segment EBITDA may not be comparable to similarly titled measures of other companies because other companies may not calculate EBITDA in the same manner. Transactions between reportable segments are accounted for on the same basis as transactions with unaffiliated third parties. Business Segment Data Condensed Consolidated Statements of Operations Unaffiliated Revenues Intersegment Revenues Total Operating Revenues Depreciation and Amortization Segment EBITDA/ Consolidated Earnings before Income Taxes (in millions) Three Months Ended September 30, 2016 Spectra Energy Partners $ 628 $ — $ 628 $ 79 $ 464 Distribution 209 — 209 47 77 Western Canada Transmission & Processing 236 — 236 56 93 Field Services — — — — 12 Total reportable segments 1,073 — 1,073 182 646 Other 2 16 18 11 (30 ) Eliminations — (16 ) (16 ) — — Depreciation and amortization — — — — 193 Interest expense — — — — 133 Interest income and other (a) — — — — 1 Total consolidated $ 1,075 $ — $ 1,075 $ 193 $ 291 Three Months Ended September 30, 2015 Spectra Energy Partners $ 612 $ — $ 612 $ 74 $ 488 Distribution 209 — 209 43 70 Western Canada Transmission & Processing 279 9 288 59 117 Field Services — — — — (3 ) Total reportable segments 1,100 9 1,109 176 672 Other 3 16 19 12 (12 ) Eliminations — (25 ) (25 ) — — Depreciation and amortization — — — — 188 Interest expense — — — — 155 Interest income and other (a) — — — — (4 ) Total consolidated $ 1,103 $ — $ 1,103 $ 188 $ 313 Nine Months Ended September 30, 2016 Spectra Energy Partners $ 1,870 $ — $ 1,870 $ 234 $ 1,408 Distribution 958 — 958 138 351 Western Canada Transmission & Processing 784 15 799 173 313 Field Services — — — — 1 Total reportable segments 3,612 15 3,627 545 2,073 Other 6 48 54 37 (85 ) Eliminations — (63 ) (63 ) — — Depreciation and amortization — — — — 582 Interest expense — — — — 437 Interest income and other (a) — — — — 3 Total consolidated $ 3,618 $ — $ 3,618 $ 582 $ 972 Nine Months Ended September 30, 2015 Spectra Energy Partners $ 1,821 $ — $ 1,821 $ 220 $ 1,421 Distribution 1,161 — 1,161 133 360 Western Canada Transmission & Processing 929 33 962 184 382 Field Services — — — — (253 ) Total reportable segments 3,911 33 3,944 537 1,910 Other 7 47 54 37 (39 ) Eliminations — (80 ) (80 ) — — Depreciation and amortization — — — — 574 Interest expense — — — — 480 Interest income and other (a) — — — — (5 ) Total consolidated $ 3,918 $ — $ 3,918 $ 574 $ 812 ___________________________________ (a) Includes foreign currency transaction gains and losses related to segment EBITDA.

Regulatory Matters

Regulatory Matters	9 Months Ended
	Sep. 30, 2016
Regulatory Matters [Abstract]
Regulatory Matters	Regulatory Matters Union Gas. In December 2015, Union Gas filed an application with the OEB for the disposition of the 2014 demand side management (DSM) deferral and variance account balances. As a result of this application, Union Gas has a receivable from customers of approximately $9 million as of September 30, 2016 and $8 million as of December 31, 2015 , which is reflected as Current Assets—Other on the Condensed Consolidated Balance Sheets. In June 2016, the OEB approved Union Gas’ application as filed and Union Gas has begun to recover the receivable from ratepayers effective October 1, 2016. In March 2016, Union Gas filed a Draft Rate Order with the OEB for rates effective January 1, 2016 based on the OEB’s February 24, 2016 updated Decision and Order on the 2015-2020 DSM Plan. In May 2016, a decision from the OEB was received approving recovery from ratepayers of approximately $19 million effective January 1, 2016 with an implementation date of July 1, 2016. In April 2016, Union Gas filed an application with the OEB for the annual disposition of the 2015 deferral account balances. As a result, Union Gas has a net receivable from customers of approximately $18 million as of September 30, 2016 and December 31, 2015 , which is primarily reflected as Current Assets—Other on the Condensed Consolidated Balance Sheets. Union Gas filed a Settlement Proposal with the OEB in July 2016 reflecting a full settlement on all issues in the proceeding. In August 2016, the OEB approved the Settlement Proposal as filed. Union Gas has begun to implement the disposition of the balances effective October 1, 2016.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense was $10 million for the three months ended September 30, 2016 , compared to $70 million for the same period in 2015 . Income tax expense was $160 million for the nine months ended September 30, 2016 , compared to $164 million for the same period in 2015 . The lower tax expense for the three-month period was primarily due to the sale of Empress on August 4, 2016 and the release of tax reserves. The nine-month periods include the $74 million tax impact of the loss on investment due to the impairment of goodwill at DCP Midstream in 2015, partially offset by tax rate changes in 2016. The effective income tax rate was 3% for the three months ended September 30, 2016 , compared to 22% for the same period in 2015 . The effective income tax rate was 16% for the nine months ended September 30, 2016 , compared to 20% for the same period in 2015 . The lower effective income tax rate for the three-month period was primarily due to the sale of Empress on August 4, 2016 and the release of tax reserves. The nine-month periods include the $74 million tax impact of the loss on investment due to the impairment of goodwill at DCP Midstream in 2015, partially offset by tax rate changes in 2016. There was an $8 million decrease in unrecognized tax benefits recorded during the nine months ended September 30, 2016 . Although uncertain, we believe it is reasonably possible that the total amount of unrecognized tax benefits could decrease by approximately $20 million to $25 million prior to September 30, 2017 due to audit settlements and statute of limitations expirations.

Earnings per Common Share

Earnings per Common Share	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings per Common Share	Earnings per Common Share Basic earnings per common share (EPS) is computed by dividing net income from controlling interests by the weighted-average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income from controlling interests by the diluted weighted-average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock, such as stock options, stock-based performance unit awards and phantom stock awards, were exercised, settled or converted into common stock. The following table presents our basic and diluted EPS calculations: Three Months Nine Months 2016 2015 2016 2015 (in millions, except per-share amounts) Net income —controlling interests $ 195 $ 174 $ 578 $ 459 Weighted-average common shares outstanding Basic 701 671 692 671 Diluted 703 672 693 672 Basic earnings per common share (a) $ 0.28 $ 0.26 $ 0.84 $ 0.68 Diluted earnings per common share (a) $ 0.28 $ 0.26 $ 0.83 $ 0.68 ___________________ (a) Quarterly earnings per share amounts are stand-alone calculations and may not be additive to full-year amounts due to rounding.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following table presents the net of tax changes in Accumulated Other Comprehensive Income (AOCI) by component, excluding amounts attributable to noncontrolling interests: Foreign Currency Translation Adjustments Pension Gas Purchase Contract Hedges Other Total Accumulated Other Comprehensive Income (Loss) (in millions) June 30, 2016 $ 425 $ (337 ) $ — $ (2 ) $ 86 Other AOCI activity (78 ) 5 — — (73 ) September 30, 2016 $ 347 $ (332 ) $ — $ (2 ) $ 13 June 30, 2015 $ 617 $ (338 ) $ — $ (3 ) $ 276 Other AOCI activity (345 ) 6 — 1 (338 ) September 30, 2015 $ 272 $ (332 ) $ — $ (2 ) $ (62 ) December 31, 2015 $ 79 $ (346 ) $ (3 ) $ 1 $ (269 ) Other AOCI activity 268 14 3 (3 ) 282 September 30, 2016 $ 347 $ (332 ) $ — $ (2 ) $ 13 December 31, 2014 $ 1,016 $ (351 ) $ (3 ) $ — $ 662 Other AOCI activity (744 ) 19 3 (2 ) (724 ) September 30, 2015 $ 272 $ (332 ) $ — $ (2 ) $ (62 )

Inventory

Inventory	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
Inventory	Inventory Inventory consists of natural gas held in storage for transmission and processing, and also includes materials and supplies. The NGLs previously included in inventory were disposed of as part of the Empress sale on August 4, 2016. See Note 2 for further discussion related to the sale of Empress. Natural gas inventories primarily relate to the Distribution segment in Canada and are valued at costs approved by the OEB. The difference between the approved price and the actual cost of gas purchased is recorded as either a receivable or a current liability, as appropriate, for future disposition with customers, subject to approval by the OEB. The remaining inventory is recorded at the lower of cost or market, primarily using average cost. The components of inventory are as follows: September 30, December 31, (in millions) Natural gas $ 214 $ 217 NGLs — 23 Materials and supplies 73 67 Total inventory $ 287 $ 307

Investments in and Loans to Unc

Investments in and Loans to Unconsolidated Affiliates	9 Months Ended
	Sep. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]
Investments in and Loans to Unconsolidated Affiliates	Investments in and Loans to Unconsolidated Affiliates Our most significant investment in unconsolidated affiliates is our 50% investment in DCP Midstream, which is accounted for under the equity method of accounting. The following represents summary financial information for DCP Midstream, presented at 100%: Three Months Nine Months 2016 2015 2016 2015 (in millions) Operating revenues $ 1,961 $ 1,851 $ 4,974 $ 5,763 Operating expenses 1,866 1,794 4,823 6,117 Operating income (loss) 95 57 151 (354 ) Net income (loss) 94 25 126 (472 ) Net income (loss) attributable to members’ interests 26 (6 ) 8 (509 ) DCP Partners issues, from time to time, limited partner units to the public, which are recorded by DCP Midstream directly to its equity. Our proportionate share of gains from those issuances, totaled $2 million during the nine months ended September 30, 2015 and is reflected in Earnings (Loss) From Equity Investments in the Condensed Consolidated Statement of Operations. During the third quarter of 2015, DCP Midstream finalized their goodwill impairment test. This resulted in the recognition of a $460 million goodwill impairment, which reduced our equity earnings from DCP Midstream by $123 million after-tax. Related Party Transactions During the third quarter of 2015, Gulfstream Natural Gas System, LLC (Gulfstream) issued unsecured debt of $800 million to fund the repayment of its current debt. Gulfstream distributed $396 million , our proportionate share of proceeds, to us of which we contributed $248 million back to Gulfstream in the fourth quarter of 2015 and the remaining $148 million , classified as Cash Flows from Investing Activities—Distribution to Equity Investment, in the second quarter of 2016.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2016
Variable Interest Entities [Abstract]
Variable Interest Entities	Variable Interest Entities Sabal Trail. On April 1, 2016, NextEra Energy, Inc. (NextEra) purchased a 9.5% interest in Sabal Trail Transmission, LLC (Sabal Trail) from SEP. Consideration for this transaction consisted of approximately $110 million cash, $102 million of which is classified as Cash Flows from Financing Activities—Contributions from Noncontrolling Interests. See Note 11 for additional information related to this transaction. As of September 30, 2016, we have an effective 37.9% ownership interest in Sabal Trail through our ownership of SEP. Sabal Trail is a joint venture that is constructing a natural gas pipeline to transport natural gas to Florida. Sabal Trail is a variable interest entity (VIE) due to insufficient equity at risk to finance its activities. We determined that we are the primary beneficiary because we direct the activities of Sabal Trail that most significantly impact its economic performance and we consolidate Sabal Trail in our financial statements. The current estimate of the total remaining construction cost is approximately $1.5 billion . The following table summarizes the assets and liabilities for Sabal Trail: Condensed Consolidated Balance Sheets Caption September 30, December 31, (in millions) Assets Current assets $ 303 $ 118 Net property, plant and equipment 1,363 773 Regulatory assets and deferred debits 58 25 Total Assets $ 1,724 $ 916 Liabilities and Equity Current liabilities $ 128 $ 84 Equity 1,596 832 Total Liabilities and Equity $ 1,724 $ 916 Nexus. We have an effective 37.9% ownership interest in Nexus Gas Transmission, LLC (Nexus) through our ownership of SEP. Nexus is a joint venture that is constructing a natural gas pipeline from Ohio to Michigan and continuing on to Ontario, Canada. Nexus is a VIE due to insufficient equity at risk to finance its activities. We determined that we are not the primary beneficiary because the power to direct the activities of Nexus that most significantly impact its economic performance is shared. Nexus is accounted for under the equity method of accounting. Our maximum exposure to loss is $1.0 billion . We have an investment in Nexus of $281 million and $90 million as of September 30, 2016 and December 31, 2015 , respectively, classified as Investments in and Loans to Unconsolidated Affiliates on our Condensed Consolidated Balance Sheets.

Intangible Asset

Intangible Asset	9 Months Ended
	Sep. 30, 2016
Intangible Assets Disclosure [Abstract]
Intangible Asset Disclosure [Text Block]	Intangible Asset During the first quarter of 2016, SEP entered into a project coordination agreement (PCA) with NextEra, Duke Energy Corporation (Duke Energy) and Williams Partners L.P. In accordance with the agreement, payments will be made, based on SEP’s proportional ownership interest in Sabal Trail, as certain milestones of the project are met. During the first quarter of 2016, the first milestone was achieved and paid, consisting of $48 million . On April 1, 2016, NextEra purchased an additional 9.5% interest in Sabal Trail from SEP, reducing SEP’s ownership interest in Sabal Trail to 50% . Upon purchase of the additional ownership interest, NextEra reimbursed SEP $8 million for NextEra’s proportional share of the first milestone payment. During the third quarter of 2016, the second milestone was achieved and paid, consisting of $40 million . The milestone payments are classified as Cash Flows from Investing Activities—Purchase of Intangible, Net. This PCA, in the amount of $80 million as of September 30, 2016 , is an intangible asset and is classified as Investments and Other Assets—Other on our Condensed Consolidated Balance Sheet. The intangible asset will be amortized over a period of 25 years beginning at the time of in-service of Sabal Trail, which is expected to occur during the first half of 2017.

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill Disclosure [Text Block]	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, 2016 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, except for the reporting units of our Western Canada Transmission & Processing and Spectra Energy Partners reportable segments, which are one level below. As permitted under accounting guidance on testing goodwill for impairment, we perform either a qualitative assessment or a quantitative assessment of each of our reporting units based on management’s judgment. With respect to our qualitative assessments, 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 values of our reporting units are less than their respective carrying amounts. See Note 9 for discussion related to the 2015 impairment of goodwill recognized by DCP Midstream.

Marketable Securities and Restr

Marketable Securities and Restricted Funds	9 Months Ended
	Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Marketable Securities and Restricted Funds	Marketable Securities and Restricted Funds We routinely invest excess cash and various restricted balances in securities such as commercial paper, bankers acceptances, corporate debt securities, Canadian equity securities, treasury bills and money market securities in the U.S. and Canada. 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 may be held and restricted for insurance purposes, capital expenditures and NEB regulatory requirements, 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 type 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. AFS Securities are as follows: Estimated Fair Value September 30, December 31, (in millions) Corporate debt securities (a) $ 20 $ 31 Canadian equity securities (b) 17 — Total available-for-sale securities $ 37 $ 31 ___________________________________ (a) Amounts related to certain construction projects. (b) Amounts related to restricted funds held and collected from customers of Western Canada Transmission & Processing and Express-Platte for Canadian pipeline abandonment in accordance with the NEB’s regulatory requirements. Our AFS securities are classified on the Condensed Consolidated Balance Sheets as follows: Estimated Fair Value September 30, December 31, (in millions) Restricted funds Investments and other assets—other $ 31 $ 11 Non-restricted funds Current assets—other 6 20 Total available-for-sale securities $ 37 $ 31 At September 30, 2016 , 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, 2016 or December 31, 2015 . HTM Securities. HTM securities are as follows: Estimated Fair Value Description Condensed Consolidated Balance Sheets Caption September 30, December 31, (in millions) Bankers acceptances Current assets—other $ 44 $ 30 Canadian government securities Current assets—other 25 24 Money market securities Current assets—other 8 3 Canadian government securities Investments and other assets—other 52 50 Bankers acceptances Investments and other assets—other — 12 Total held-to-maturity securities $ 129 $ 119 All of our HTM securities are restricted funds pursuant to certain M&N Canada and Express-Platte (our crude oil pipeline system) debt agreements. The funds restricted for M&N Canada, plus future cash from operations that would otherwise be available for distribution to the partners of M&N Canada, are required to be placed in escrow until the balance in escrow is sufficient to fund all future debt service on the M&N Canada 6.90% senior secured notes. There are sufficient funds held in escrow to fund all future debt service on these M&N Canada notes as of September 30, 2016 . At September 30, 2016 , the weighted-average contractual maturity of outstanding HTM securities was less than one year . There were no material gross unrecognized holding gains or losses associated with investments in HTM securities at September 30, 2016 or December 31, 2015 . Other Restricted Funds . In addition to the portions of the AFS and HTM securities that were restricted as described above, we had other restricted funds totaling $25 million at September 30, 2016 and $11 million at December 31, 2015 classified as Current Assets—Other on the Condensed Consolidated Balance Sheets. Included in these restricted funds are $13 million at September 30, 2016 of funds received from the province of Ontario related to the Green Investment Fund that is to be distributed to eligible homeowners, based on specific energy conservation initiatives at Union Gas and $12 million and $11 million at September 30, 2016 and December 31, 2015 , respectively, related to additional amounts for insurance. We also had other restricted funds totaling $43 million at September 30, 2016 and $38 million at December 31, 2015 classified as Investments and Other Assets—Other on the Condensed Consolidated Balance Sheets . Included in these restricted funds are $17 million and $24 million at September 30, 2016 and December 31, 2015 , respectively, related to funds held and collected from customers of Western Canada Transmission & Processing and Express-Platte for Canadian pipeline abandonment in accordance with the NEB’s regulatory requirements, $7 million and $14 million , respectively, related to certain construction projects and $19 million at September 30, 2016 of funds received from the province of Ontario related to the Green Investment Fund. Changes in restricted balances are presented within Cash Flows from Investing Activities on our Condensed Consolidated Statements of Cash Flows.

Debt and Credit Facilities

Debt and Credit Facilities	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Debt and Credit Facilities	Debt and Credit Facilities Available Credit Facilities and Restrictive Debt Covenants Expiration Date Total Credit Facilities Capacity Commercial Paper Outstanding at September 30, 2016 Available Credit Facilities Capacity (in millions) Spectra Energy Capital, LLC Multi-year syndicated (a) 2021 $ 1,000 $ 460 $ 540 364-day syndicated (a) 2017 2,000 — 2,000 SEP (b) 2021 2,500 1,177 1,323 Westcoast (c) 2021 305 — 305 Union Gas (d) 2021 533 — 533 Total $ 6,338 $ 1,637 $ 4,701 _________ (a) Revolving credit facilities contain a covenant requiring the Spectra Energy consolidated debt-to-total capitalization ratio, as defined in the agreements, to not exceed 65% . Per the terms of the agreements, collateralized debt is excluded from the calculation of the ratio. This ratio was 55.8% at September 30, 2016 . (b) Revolving credit facility contains a covenant that requires SEP to maintain a ratio of total Consolidated Indebtedness-to-Consolidated EBITDA, as defined in the agreement, of 5.0 to 1 or less. As of September 30, 2016 , this ratio was 3.7 to 1. (c) U.S. dollar equivalent at September 30, 2016 . The revolving credit facility is 400 million Canadian dollars and contains a covenant that requires the Westcoast non-consolidated debt-to-total capitalization ratio to not exceed 75% . The ratio was 31.1% at September 30, 2016 . (d) U.S. dollar equivalent at September 30, 2016 . The revolving credit facility is 700 million Canadian dollars and contains a covenant that requires the Union Gas debt-to-total capitalization ratio to not exceed 75% and a provision which requires Union Gas to repay all borrowings under the facility for a period of two days during the second quarter of each year. The ratio was 68.1% at September 30, 2016 . On September 29, 2016, we entered into a new one-year, $2 billion credit facility at Spectra Energy Capital, LLC (Spectra Capital), which expires in 2017 . Proceeds from borrowings under the credit facility will be used for general corporate purposes. Amounts borrowed under the credit facility must be repaid following any change in control, including any that results from the proposed merger with Enbridge. On April 29, 2016, we amended the Union Gas and SEP revolving credit agreements. The Union Gas revolving credit facility was increased to 700 million Canadian dollars and the SEP revolving facility was increased to $2.5 billion . The expiration of both facilities was extended, with both facilities expiring in 2021 . On April 29, 2016, we amended the Westcoast and Spectra Capital revolving credit agreements. The expiration of both credit facilities was extended, with both facilities expiring in 2021 . The issuances of commercial paper, letters of credit and revolving borrowings reduce the amount available under the credit facilities. As of September 30, 2016 , there were no letters of credit issued or revolving borrowings outstanding under the credit facilities. Our credit agreements contain various covenants, including the maintenance of certain financial ratios. Failure to meet those covenants beyond applicable grace periods could result in accelerated due dates and/or termination of the agreements. As of September 30, 2016, we were in compliance with those covenants. In addition, our credit agreements allow for acceleration of payments or termination of the agreements due to nonpayment, or in some cases, due to the acceleration of other significant indebtedness of the borrower or some of its subsidiaries. Our debt and credit agreements do not contain provisions that trigger an acceleration of indebtedness based solely on the occurrence of a material adverse change in our financial condition or results of operations. Debt Issuances. On May 31, 2016, Union Gas issued 250 million Canadian dollars (approximately $191 million as of the issuance date) of 2.81% unsecured notes due 2026 and 250 million Canadian dollars (approximately $191 million as of the issuance date) of 3.80% unsecured notes due 2046 . Net proceeds from the offerings were used for repayment of short term debt and debt maturities, capital expenditures and general corporate purposes.

Preferred Stock of Subsidiaries

Preferred Stock of Subsidiaries	9 Months Ended
	Sep. 30, 2016
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Subsidiary Preferred Stock	Preferred Stock of Subsidiaries On August 30, 2016, Westcoast issued 12 million Cumulative 5-Year Minimum Rate Reset Redeemable First Preferred Shares, Series 12 for an aggregate principal amount of 300 million Canadian dollars (approximately $229 million as of the issuance date). Net proceeds from the issuance were used to fund capital expenditures and for general corporate purposes.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following presents, for each of the fair value hierarchy levels, assets and liabilities that are measured and recorded at fair value on a recurring basis: Description Condensed Consolidated Balance Sheet Caption September 30, 2016 Total Level 1 Level 2 Level 3 (in millions) Corporate debt securities Cash and cash equivalents $ 346 $ — $ 346 $ — Corporate debt securities Current assets—other 6 — 6 — Interest rate swaps Current assets—other 1 — 1 — Corporate debt securities Investments and other assets—other 14 — 14 — Interest rate swaps Investments and other assets—other 55 — 55 — Canadian equity securities Investments and other assets—other 17 17 — — Total Assets $ 439 $ 17 $ 422 $ — Description Condensed Consolidated Balance Sheet Caption December 31, 2015 Total Level 1 Level 2 Level 3 (in millions) Corporate debt securities Cash and cash equivalents $ 137 $ — $ 137 $ — Corporate debt securities Current assets—other 20 — 20 — Commodity derivatives Current assets—other 36 — — 36 Commodity derivatives Investments and other assets—other 5 — — 5 Corporate debt securities Investments and other assets—other 11 — 11 — Interest rate swaps Investments and other assets—other 37 — 37 — Total Assets $ 246 $ — $ 205 $ 41 The following presents changes in Level 3 assets and liabilities that are measured at fair value on a recurring basis using significant unobservable inputs: Three Months Nine Months 2016 2015 2016 2015 (in millions) Derivative assets (liabilities) Fair value, beginning of period $ (2 ) $ 50 $ 41 $ 78 Total gains (losses): Included in earnings 8 18 (7 ) 27 Included in other comprehensive income — (4 ) 1 (9 ) Purchases — (5 ) (1 ) (2 ) Settlements (6 ) (6 ) (34 ) (41 ) Fair value, end of period $ — $ 53 $ — $ 53 Unrealized gains (losses) relating to instruments held at the end of the period $ — $ 5 $ — $ (11 ) 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. For interest rate swaps, we utilize data obtained from a third-party source for the determination of fair value. Both the future cash flows for the fixed-leg and floating-leg of our swaps are discounted to present value. In addition, credit default swap rates are used to develop the adjustment for credit risk embedded in our positions. We believe that since some of the inputs and assumptions for the calculations of fair value are derived from observable market data, a Level 2 classification is appropriate. 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 require significant management judgment or estimation. As of September 30, 2016 , there are no financial instruments classified as Level 3. Those reported in Level 3 at December 31, 2015 consisted of NGL revenue swap contracts related to the Empress assets in Western Canada Transmission & Processing, which were disposed of on August 4, 2016. See Note 2 for further discussion related to the sale of Empress. As of December 31, 2015, we reported certain of our NGL basis swaps at fair value using Level 3 inputs due to such derivatives not having observable market prices for substantially the full term of the derivative asset or liability. For valuations that included both observable and unobservable inputs, if the unobservable input was determined to be significant to the overall inputs, the entire valuation was categorized in Level 3. This included derivatives valued using indicative price quotations whose contract length extended into unobservable periods. The fair value of these NGL basis swaps was determined using a discounted cash flow valuation technique based on a forward commodity basis curve. For those derivatives, the primary input to the valuation model was the forward commodity basis curve, which was based on observable or public data sources and extrapolated when observable prices were not available. Financial Instruments The fair values of financial in struments 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. September 30, 2016 December 31, 2015 Book Value Approximate Fair Value Book Value Approximate Fair Value (in millions) Note receivable, noncurrent (a) $ 71 $ 71 $ 71 $ 71 Long-term debt, including current maturities (b) 13,563 15,031 13,567 13,891 __________ (a) Included within Investments in and Loans to Unconsolidated Affiliates. (b) Excludes commercial paper, capital leases, unamortized items and fair value hedge carrying value adjustments. The fair value of our long-term debt is determined based on market-based prices as described in the Level 2 valuation technique described above and is classified as Level 2. The fair values of cash and cash equivalents, restricted cash, short-term investments, accounts receivable, notes receivable—noncurrent, accounts payable and commercial paper 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 the nine months ended September 30, 2016 and 2015 , there were no material adjustments to assets and liabilities measured at fair value on a nonrecurring basis.

Risk Management and Hedging Act

Risk Management and Hedging Activities	9 Months Ended
	Sep. 30, 2016
Risk Management And Hedging Activities [Abstract]
Risk Management and Hedging Activities	Risk Management and Hedging Activities We are exposed to the impact of market fluctuations in the prices of NGLs and natural gas purchased as a result of our investment in DCP Midstream and processing operations associated with our U.S. pipeline assets. Exposure to interest rate risk exists as a result of the issuance of variable and fixed-rate debt and commercial paper. We are exposed to foreign currency risk from our Canadian operations. We employ established policies and procedures to manage our risks associated with these market fluctuations, which may include the use of derivatives, mostly around interest rate and commodity exposures. As of April 2016, we ceased entering into new contracts under our Empress risk management program. See Note 2 for further discussion related to the sale of Empress. DCP Midstream manages their direct exposure to market prices separate from Spectra Energy, and utilizes various risk management strategies, including the use of commodity derivatives. Other than the interest rate swaps and commodity derivatives as described below, we did not have significant derivatives outstanding during the nine months ended September 30, 2016 . Interest Rate Swaps At September 30, 2016 , we had “pay floating—receive fixed” interest rate swaps outstanding with a total notional amount of $2 billion to hedge against changes in the fair value of our fixed-rate debt that arise as a result of changes in market interest rates. These swaps also allow us to transform a portion of the underlying interest payments related to our long-term fixed-rate debt securities into variable-rate interest payments in order to achieve our desired mix of fixed and variable-rate debt. Information about our interest rate swaps that had netting or rights of offset arrangements is as follows: September 30, 2016 December 31, 2015 Gross Amounts Presented in the Condensed Consolidated Balance Sheet Amounts Not Offset in the Condensed Consolidated Balance Sheet Net Amount Gross Amounts Presented in the Condensed Consolidated Balance Sheet Amounts Not Offset in the Condensed Consolidated Balance Sheet Net Amount Description (in millions) Assets $ 56 $ — $ 56 $ 37 $ — $ 37 Commodity Derivatives At September 30, 2016, we had no commodity mark-to-market derivatives outstanding. At December 31, 2015, we had commodity mark-to-market derivatives outstanding that had netting or rights of offset arrangements as follows: December 31, 2015 Gross Amounts Gross Amounts Offset Net Amount Presented in the Condensed Consolidated Balance Sheet Description (in millions) Assets $ 104 $ 63 $ 41 Liabilities 63 63 — Information regarding the impacts of commodity derivatives on our Condensed Consolidated Statements of Operations is as follows: Three Months Nine Months Derivatives Condensed Consolidated Statements of Operations Caption 2016 2015 2016 2015 (in millions) Commodity derivatives Sales of natural gas liquids $ 8 $ 13 $ (8 ) $ 25

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Environmental We are subject to various U.S. federal, state and local laws and regulations, as well as Canadian federal and provincial laws, regarding air and water quality, climate change, hazardous and solid waste disposal and other environmental matters. These laws and regulations can change from time to time, imposing new obligations on us. Like others in the energy industry, we and our affiliates are responsible for environmental remediation at various contaminated sites. These include some properties that are part of our ongoing operations, sites formerly owned or used by us, and sites owned by third parties. Remediation typically involves management of contaminated soils and may involve groundwater remediation. Managed in conjunction with relevant federal, state/provincial and local agencies, activities vary with site conditions and locations, remedial requirements, complexity and sharing of responsibility. If remediation activities involve statutory joint and several liability provisions, strict liability, or cost recovery or contribution actions, we or our affiliates could potentially be held responsible for contamination caused by other parties. In some instances, we may share liability associated with contamination with other potentially responsible parties, and may also benefit from contractual indemnities that cover some or all cleanup costs. All of these sites generally are managed in the normal course of business or affiliated operations. Litigation Litigation and Legal Proceedings. We are involved in legal, tax and regulatory proceedings in various forums arising in the ordinary course of business, including matters regarding contract and payment claims, some of which 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 for legal matters recorded as of September 30, 2016 or December 31, 2015 related to litigation. Other Commitments and Contingencies See Note 19 for a discussion of guarantees and indemnifications.

Guarantees and Indemnifications

Guarantees and Indemnifications	9 Months Ended
	Sep. 30, 2016
Guarantees [Abstract]
Guarantees and Indemnifications	Guarantees and Indemnifications We have various financial guarantees and indemnifications which are issued in the normal course of business. As discussed below, these contracts include financial guarantees, stand-by letters of credit, debt guarantees, surety bonds and indemnifications. We enter into these arrangements to facilitate a commercial transaction with a third party by enhancing the value of the transaction to the third party. To varying degrees, these guarantees involve elements of performance and credit risk, which are not included on our Condensed Consolidated Balance Sheets. The possibility of having to perform under these guarantees and indemnifications is largely dependent upon future operations of various subsidiaries, investees and other third parties, or the occurrence of certain future events. We have issued performance guarantees to customers and other third parties that guarantee the payment and performance of other parties, including certain non-100%-owned entities. In connection with our spin-off from Duke Energy in 2007, certain guarantees that were previously issued by us were assigned to, or replaced by, Duke Energy as guarantor in 2006. For any remaining guarantees of other Duke Energy obligations, Duke Energy has indemnified us against any losses incurred under these guarantee arrangements. The maximum potential amount of future payments we could have been required to make under these performance guarantees as of September 30, 2016 was approximately $406 million , which has been indemnified by Duke Energy as discussed above. One of these outstanding performance guarantees, which has a maximum potential amount of future payment of $201 million , expires in 2028 . The remaining guarantees have no contractual expirations. We have also issued joint and several guarantees to some of the Duke/Fluor Daniel (D/FD) project owners, guaranteeing the performance of D/FD under its engineering, procurement and construction contracts and other contractual commitments in place at the time of our spin-off from Duke Energy. D/FD is one of the entities transferred to Duke Energy in connection with our spin-off. Substantially all of these guarantees have no contractual expiration and no stated maximum amount of future payments that we could be required to make. Fluor Enterprises Inc., as 50% owner in D/FD, issued similar joint and several guarantees to the same D/FD project owners. Westcoast, a 100% -owned subsidiary, has issued performance guarantees to third parties guaranteeing the performance of unconsolidated entities, such as equity method investments, and of entities previously sold by Westcoast to third parties. Those guarantees require Westcoast to make payment to the guaranteed third party upon the failure of such unconsolidated or sold entity to make payment under some of its contractual obligations, such as debt agreements, purchase contracts and leases. We have entered into various indemnification agreements related to purchase and sale agreements and other types of contractual agreements with vendors and other third parties. These agreements typically cover environmental, litigation and other matters, as well as breaches of representations, warranties and covenants. Typically, claims may be made by third parties for various periods of time, depending on the nature of the claim. Our potential exposure under these indemnification agreements can range from a specified amount, such as the purchase price, to an unlimited dollar amount, depending on the nature of the claim and the particular transaction. We are unable to estimate the total potential amount of future payments under these indemnification agreements due to several factors, such as the unlimited exposure under certain guarantees. As of September 30, 2016 , the amounts recorded for the guarantees and indemnifications described above are not material, both individually and in the aggregate.

Issuances of Common Stock

Issuances of Common Stock	9 Months Ended
	Sep. 30, 2016
Issuances of Common Stock [Abstract]
Issuances of Common Stock	Issuances of Common Stock On March 1, 2016, we entered into an equity distribution agreement under which we may sell and issue common stock up to an aggregate offering price of $500 million . The equity distribution agreement allows us to offer and sell common stock at prices deemed appropriate through sales agents. Sales of common stock under the equity distribution agreement will be made by means of ordinary brokers’ transactions through the facilities of the New York Stock Exchange (NYSE), in block transactions, or as otherwise agreed upon by one or more of the sales agents and us. We intend to use the net proceeds from sales under this at-the-market program for general corporate purposes, including investments in subsidiaries to fund capital expenditures. We issued approximately 12.9 million of common shares to the public under this program, for total net proceeds of $383 million through September 30, 2016 . In April 2016, we issued 16.1 million common shares to the public for net proceeds of approximately $479 million . Net proceeds from the offering were used to purchase approximately 10.4 million common units in SEP. SEP used the proceeds from our unit purchase for general corporate purposes, including the funding of its current expansion capital plan.

Issuances of SEP Units

Issuances of SEP Units	9 Months Ended
	Sep. 30, 2016
Noncontrolling Interest [Abstract]
Effects of Change in Noncontrolling Interest Ownership	Issuances of SEP Units During the nine months ended September 30, 2016 , SEP issued 10.4 million common units to the public under its at-the-market program and approximately 212,000 general partner units to Spectra Energy. Total net proceeds to SEP were $483 million (net proceeds to Spectra Energy were $473 million ). In April 2016, SEP issued 10.4 million common units and 0.2 million general partner units to Spectra Energy in a private placement transaction. See Note 20 for further discussion. In connection with the issuances of the units, a $40 million gain ( $25 million net of tax) to Additional Paid-in Capital and a $432 million increase in Equity—Noncontrolling Interests were recorded during the nine months ended September 30, 2016 . The issuances decreased Spectra Energy’s ownership in SEP from 78% to 76% at September 30, 2016 . The following table presents the effects of the issuances of SEP units: Three Months Nine Months 2016 2015 2016 2015 (in millions) Net income—controlling interests $ 195 $ 174 $ 578 $ 459 Increase in additional paid-in capital resulting from issuances of SEP units 10 24 25 49 Total net income—controlling interests and changes in equity—controlling interests $ 205 $ 198 $ 603 $ 508

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans Retirement Plans. We have a qualified non-contributory defined benefit (DB) retirement plan for U.S. employees and non-qualified, non-contributory, unfunded defined benefit plans which cover certain current and former U.S. executives. Our Westcoast subsidiary maintains qualified and non-qualified, contributory and non-contributory, DB and defined contribution (DC) retirement plans covering substantially all employees of our Canadian operations. Our policy is to fund our retirement plans, where applicable, on an actuarial basis to provide assets sufficient to meet benefits to be paid to plan participants or as required by legislation or plan terms. We made contributions of $16 million to our U.S. retirement plans in both of the nine months ended September 30, 2016 and 2015 . We made total contributions to the Canadian DC and DB plans of $20 million in the nine months ended September 30, 2016 and $23 million in the same period in 2015 . We anticipate that we will make total contributions of approximately $22 million to the U.S. plans and approximately $26 million to the Canadian plans in 2016 . Qualified and Non-Qualified Pension Plans—Components of Net Periodic Pension Cost Three Months Nine Months 2016 2015 2016 2015 (in millions) U.S. Service cost benefit earned $ 4 $ 4 $ 14 $ 14 Interest cost on projected benefit obligation 7 6 19 18 Expected return on plan assets (9 ) (10 ) (29 ) (31 ) Amortization of loss 1 2 5 7 Net periodic pension cost $ 3 $ 2 $ 9 $ 8 Canada Service cost benefit earned $ 8 $ 8 $ 23 $ 24 Interest cost on projected benefit obligation 10 11 32 33 Expected return on plan assets (16 ) (16 ) (48 ) (50 ) Amortization of loss 5 6 14 19 Amortization of prior service cost — — 1 1 Net periodic pension cost $ 7 $ 9 $ 22 $ 27 Other Post-Retirement Benefit Plans. We provide certain health care and life insurance benefits for retired employees on a contributory and non-contributory basis. Employees are eligible for these benefits if they have met age and service requirements at retirement, as defined in the plans. Other Post-Retirement Benefit Plans—Components of Net Periodic Benefit Cost Three Months Nine Months 2016 2015 2016 2015 (in millions) U.S. Service cost benefit earned $ — $ 1 $ — $ 1 Interest cost on accumulated post-retirement benefit obligation 2 1 6 5 Expected return on plan assets (2 ) (1 ) (4 ) (4 ) Net periodic other post-retirement benefit cost $ — $ 1 $ 2 $ 2 Canada Service cost benefit earned $ 1 $ 1 $ 2 $ 3 Interest cost on accumulated post-retirement benefit obligation 1 1 3 3 Net periodic other post-retirement benefit cost $ 2 $ 2 $ 5 $ 6 Retirement/Savings Plan. In addition to the retirement plans described above, we also have defined contribution employee savings plans available to both U.S. and Canadian employees. Employees may participate in a matching contribution where we match a certain percentage of before-tax employee contributions of up to 6% of eligible pay per pay period for U.S. employees and up to 5% of eligible pay per pay period for Canadian employees. We expensed pre-tax employer matching contributions of $4 million in both of the three months ended September 30, 2016 and 2015 , and $11 million in both of the nine months ended September 30, 2016 and 2015 for U.S. employees. We expensed pre-tax employer matching contributions of $3 million and $2 million in the three months ended September 30, 2016 and 2015 , respectively, and $9 million and $8 million in the nine months ended September 30, 2016 and 2015, respectively, for Canadian employees.

Condensed Consolidating Financi

Condensed Consolidating Financial Information	9 Months Ended
	Sep. 30, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Consolidating Financial Information	Condensed Consolidating Financial Information Spectra Energy Corp has agreed to fully and unconditionally guarantee the payment of principal and interest under all series of notes outstanding under the Senior Indenture of Spectra Capital, a 100%-owned, consolidated subsidiary. In accordance with Securities and Exchange Commission (SEC) rules, the following condensed consolidating financial information is presented. The information shown for Spectra Energy Corp and Spectra Capital is presented utilizing the equity method of accounting for investments in subsidiaries, as required. The non-guarantor subsidiaries column represents all consolidated subsidiaries of Spectra Capital. This information should be read in conjunction with our accompanying Condensed Consolidated Financial Statements and notes thereto. Spectra Energy Corp Condensed Consolidating Statements of Operations (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated Three Months Ended September 30, 2016 Total operating revenues $ — $ — $ 1,076 $ (1 ) $ 1,075 Total operating expenses (5 ) 1 759 (1 ) 754 Operating income (loss) 5 (1 ) 317 — 321 Earnings from equity investments — — 51 — 51 Equity in earnings of consolidated subsidiaries 193 272 — (465 ) — Other income and expenses, net — — 52 — 52 Interest expense — 47 86 — 133 Earnings before income taxes 198 224 334 (465 ) 291 Income tax expense (benefit) 3 31 (24 ) — 10 Net income 195 193 358 (465 ) 281 Net income—noncontrolling interests — — 86 — 86 Net income—controlling interests $ 195 $ 193 $ 272 $ (465 ) $ 195 Three Months Ended September 30, 2015 Total operating revenues $ — $ — $ 1,105 $ (2 ) $ 1,103 Total operating expenses 2 (1 ) 715 (2 ) 714 Operating income (loss) (2 ) 1 390 — 389 Earnings from equity investments — — 48 — 48 Equity in earnings of consolidated subsidiaries 170 307 — (477 ) — Other income and expenses, net — (1 ) 32 — 31 Interest expense — 61 94 — 155 Earnings before income taxes 168 246 376 (477 ) 313 Income tax expense (benefit) (6 ) 76 — — 70 Net income 174 170 376 (477 ) 243 Net income—noncontrolling interests — — 69 — 69 Net income—controlling interests $ 174 $ 170 $ 307 $ (477 ) $ 174 Spectra Energy Corp Condensed Consolidating Statements of Operations (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated Nine Months Ended September 30, 2016 Total operating revenues $ — $ — $ 3,620 $ (2 ) $ 3,618 Total operating expenses — 3 2,431 (2 ) 2,432 Operating income (loss) — (3 ) 1,189 — 1,186 Earnings from equity investments — — 100 — 100 Equity in earnings of consolidated subsidiaries 564 925 — (1,489 ) — Other income and expenses, net (2 ) — 125 — 123 Interest expense — 170 267 — 437 Earnings before income taxes 562 752 1,147 (1,489 ) 972 Income tax expense (benefit) (16 ) 188 (12 ) — 160 Net income 578 564 1,159 (1,489 ) 812 Net income—noncontrolling interests — — 234 — 234 Net income—controlling interests $ 578 $ 564 $ 925 $ (1,489 ) $ 578 Nine Months Ended September 30, 2015 Total operating revenues $ — $ — $ 3,921 $ (3 ) $ 3,918 Total operating expenses 5 (2 ) 2,582 (3 ) 2,582 Operating income (loss) (5 ) 2 1,339 — 1,336 Loss from equity investments — — (117 ) — (117 ) Equity in earnings of consolidated subsidiaries 445 790 — (1,235 ) — Other income and expenses, net — (1 ) 74 — 73 Interest expense — 183 297 — 480 Earnings before income taxes 440 608 999 (1,235 ) 812 Income tax expense (benefit) (19 ) 163 20 — 164 Net income 459 445 979 (1,235 ) 648 Net income—noncontrolling interests — — 189 — 189 Net income—controlling interests $ 459 $ 445 $ 790 $ (1,235 ) $ 459 Spectra Energy Corp Condensed Consolidating Statements of Comprehensive Income (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated Three Months Ended September 30, 2016 Net income $ 195 $ 193 $ 358 $ (465 ) $ 281 Other comprehensive income (loss) 2 — (77 ) — (75 ) Total comprehensive income, net of tax 197 193 281 (465 ) 206 Less: comprehensive income—noncontrolling interests — — 84 — 84 Comprehensive income—controlling interests $ 197 $ 193 $ 197 $ (465 ) $ 122 Three Months Ended September 30, 2015 Net income $ 174 $ 170 $ 376 $ (477 ) $ 243 Other comprehensive income (loss) 2 1 (346 ) — (343 ) Total comprehensive income (loss), net of tax 176 171 30 (477 ) (100 ) Less: comprehensive income—noncontrolling interests — — 64 — 64 Comprehensive income (loss)—controlling interests $ 176 $ 171 $ (34 ) $ (477 ) $ (164 ) Nine Months Ended September 30, 2016 Net income $ 578 $ 564 $ 1,159 $ (1,489 ) $ 812 Other comprehensive income 4 — 283 — 287 Total comprehensive income, net of tax 582 564 1,442 (1,489 ) 1,099 Less: comprehensive income—noncontrolling interests — — 239 — 239 Comprehensive income—controlling interests $ 582 $ 564 $ 1,203 $ (1,489 ) $ 860 Nine Months Ended September 30, 2015 Net income $ 459 $ 445 $ 979 $ (1,235 ) $ 648 Other comprehensive income (loss) 5 1 (741 ) — (735 ) Total comprehensive income (loss), net of tax 464 446 238 (1,235 ) (87 ) Less: comprehensive income—noncontrolling interests — — 178 — 178 Comprehensive income (loss)—controlling interests $ 464 $ 446 $ 60 $ (1,235 ) $ (265 ) Spectra Energy Corp Condensed Consolidating Balance Sheet September 30, 2016 (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated Cash and cash equivalents $ — $ 1 $ 463 $ — $ 464 Receivables—consolidated subsidiaries 19 — — (19 ) — Notes receivable—current—consolidated subsidiaries — — 388 (388 ) — Receivables—other — — 712 — 712 Other current assets 16 2 561 (5 ) 574 Total current assets 35 3 2,124 (412 ) 1,750 Investments in and loans to unconsolidated affiliates — — 2,742 — 2,742 Investments in consolidated subsidiaries 14,844 20,452 — (35,296 ) — Advances receivable—consolidated subsidiaries — 5,064 1,549 (6,613 ) — Notes receivable—consolidated subsidiaries — — 2,800 (2,800 ) — Goodwill — — 4,203 — 4,203 Other assets 38 31 332 — 401 Net property, plant and equipment — — 25,337 — 25,337 Regulatory assets and deferred debits 4 12 1,488 — 1,504 Total Assets $ 14,921 $ 25,562 $ 40,575 $ (45,121 ) $ 35,937 Accounts payable $ 2 $ 3 $ 731 $ — $ 736 Accounts payable—consolidated subsidiaries — 19 — (19 ) — Commercial paper — 460 1,177 — 1,637 Short-term borrowings—consolidated subsidiaries — 388 — (388 ) — Taxes accrued — 4 74 (5 ) 73 Current maturities of long-term debt — — 467 — 467 Other current liabilities 78 45 651 — 774 Total current liabilities 80 919 3,100 (412 ) 3,687 Long-term debt — 2,903 10,191 — 13,094 Advances payable—consolidated subsidiaries 6,613 — — (6,613 ) — Notes payable—consolidated subsidiaries — 2,800 — (2,800 ) — Deferred credits and other liabilities 760 4,096 2,319 — 7,175 Preferred stock of subsidiaries — — 562 — 562 Equity Controlling interests 7,468 14,844 20,452 (35,296 ) 7,468 Noncontrolling interests — — 3,951 — 3,951 Total equity 7,468 14,844 24,403 (35,296 ) 11,419 Total Liabilities and Equity $ 14,921 $ 25,562 $ 40,575 $ (45,121 ) $ 35,937 Spectra Energy Corp Condensed Consolidating Balance Sheet December 31, 2015 (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated Cash and cash equivalents $ — $ 1 $ 212 $ — $ 213 Receivables—consolidated subsidiaries 15 6 13 (34 ) — Notes receivable—current—consolidated subsidiaries — — 387 (387 ) — Receivables—other 2 — 804 — 806 Other current assets 25 — 604 — 629 Total current assets 42 7 2,020 (421 ) 1,648 Investments in and loans to unconsolidated affiliates — — 2,592 — 2,592 Investments in consolidated subsidiaries 13,919 19,161 — (33,080 ) — Advances receivable—consolidated subsidiaries — 5,273 1,326 (6,599 ) — Notes receivable—consolidated subsidiaries — — 2,800 (2,800 ) — Goodwill — — 4,154 — 4,154 Other assets 41 27 242 — 310 Net property, plant and equipment — — 22,918 — 22,918 Regulatory assets and deferred debits 3 3 1,295 — 1,301 Total Assets $ 14,005 $ 24,471 $ 37,347 $ (42,900 ) $ 32,923 Accounts payable $ 2 $ 3 $ 506 $ — $ 511 Accounts payable—consolidated subsidiaries 4 28 2 (34 ) — Commercial paper — 481 631 — 1,112 Short-term borrowings—consolidated subsidiaries — 387 — (387 ) — Taxes accrued 5 — 73 — 78 Current maturities of long-term debt — — 652 — 652 Other current liabilities 102 48 889 — 1,039 Total current liabilities 113 947 2,753 (421 ) 3,392 Long-term debt — 2,891 10,001 — 12,892 Advances payable—consolidated subsidiaries 6,599 — — (6,599 ) — Notes payable—consolidated subsidiaries — 2,800 — (2,800 ) — Deferred credits and other liabilities 767 3,914 2,087 — 6,768 Preferred stock of subsidiaries — — 339 — 339 Equity Controlling interests 6,526 13,919 19,161 (33,080 ) 6,526 Noncontrolling interests — — 3,006 — 3,006 Total equity 6,526 13,919 22,167 (33,080 ) 9,532 Total Liabilities and Equity $ 14,005 $ 24,471 $ 37,347 $ (42,900 ) $ 32,923 Spectra Energy Corp Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2016 (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 578 $ 564 $ 1,159 $ (1,489 ) $ 812 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Depreciation and amortization — — 599 — 599 Earnings from equity investments — — (100 ) — (100 ) Equity in earnings of consolidated subsidiaries (564 ) (925 ) — 1,489 — Distributions from equity investments — — 88 — 88 Other (9 ) 194 15 — 200 Net cash provided by (used in) operating activities 5 (167 ) 1,761 — 1,599 CASH FLOWS FROM INVESTING ACTIVITIES Capital expenditures — — (2,407 ) — (2,407 ) Investments in and loans to unconsolidated affiliates — — (181 ) — (181 ) Purchase of intangible, net — — (80 ) — (80 ) Disposition — — 204 — 204 Purchases of held-to-maturity securities — — (479 ) — (479 ) Proceeds from sales and maturities of held-to-maturity securities — — 475 — 475 Purchases of available-for-sale securities — — (565 ) — (565 ) Proceeds from sales and maturities of available-for-sale securities — — 559 — 559 Distributions from equity investments — — 45 — 45 Distribution to equity investment — — (148 ) — (148 ) Advances from (to) affiliates (57 ) 196 — (139 ) — Other changes in restricted funds — — (19 ) — (19 ) Other — — 1 — 1 Net cash provided by (used in) investing activities (57 ) 196 (2,595 ) (139 ) (2,595 ) CASH FLOWS FROM FINANCING ACTIVITIES Proceeds from the issuance of long-term debt — — 382 — 382 Payments for the redemption of long-term debt — — (619 ) — (619 ) Net increase (decrease) in commercial paper — (21 ) 523 — 502 Distributions to noncontrolling interests — — (176 ) — (176 ) Contributions from noncontrolling interests — — 437 — 437 Proceeds from the issuances of Spectra Energy common stock 878 — — — 878 Proceeds from the issuances of SEP common units — — 473 — 473 Proceeds from the issuance of Westcoast preferred stock — — 229 — 229 Dividends paid on common stock (842 ) — — — (842 ) Distributions and advances from (to) affiliates 14 (8 ) (145 ) 139 — Other 2 — (22 ) — (20 ) Net cash provided by (used in) financing activities 52 (29 ) 1,082 139 1,244 Effect of exchange rate changes on cash — — 3 — 3 Net increase in cash and cash equivalents — — 251 — 251 Cash and cash equivalents at beginning of period — 1 212 — 213 Cash and cash equivalents at end of period $ — $ 1 $ 463 $ — $ 464 Spectra Energy Corp Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2015 (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 459 $ 445 $ 979 $ (1,235 ) $ 648 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Depreciation and amortization — — 584 — 584 Loss from equity investments — — 117 — 117 Equity in earnings of consolidated subsidiaries (445 ) (790 ) — 1,235 — Distributions from equity investments — — 145 — 145 Other 44 109 176 — 329 Net cash provided by (used in) operating activities 58 (236 ) 2,001 — 1,823 CASH FLOWS FROM INVESTING ACTIVITIES Capital expenditures — — (1,817 ) — (1,817 ) Investments in and loans to unconsolidated — — (91 ) — (91 ) Purchases of held-to-maturity securities — — (463 ) — (463 ) Proceeds from sales and maturities of held-to-maturity securities — — 457 — 457 Proceeds from sales and maturities of available-for-sale securities — — 1 — 1 Distributions from equity investments — — 441 — 441 Advances from (to) affiliates (82 ) 62 — 20 — Other changes in restricted funds — — (24 ) — (24 ) Other — — (7 ) — (7 ) Net cash provided by (used in) investing activities (82 ) 62 (1,503 ) 20 (1,503 ) CASH FLOWS FROM FINANCING ACTIVITIES Proceeds from the issuance of long-term debt — — 1,332 — 1,332 Payments for the redemption of long-term debt — — (153 ) — (153 ) Net increase (decrease) in commercial paper — 170 (1,154 ) — (984 ) Distributions to noncontrolling interests — — (140 ) — (140 ) Contributions from noncontrolling interests — — 164 — 164 Proceeds from the issuances of SEP common units — — 351 — 351 Dividends paid on common stock (747 ) — — — (747 ) Distributions and advances from (to) affiliates 774 4 (758 ) (20 ) — Other (3 ) — (11 ) — (14 ) Net cash provided by (used in) financing activities 24 174 (369 ) (20 ) (191 ) Effect of exchange rate changes on cash — — (6 ) — (6 ) Net increase in cash and cash equivalents — — 123 — 123 Cash and cash equivalents at beginning of period — 1 214 — 215 Cash and cash equivalents at end of period $ — $ 1 $ 337 $ — $ 338

New Accounting Pronouncements

New Accounting Pronouncements	9 Months Ended
	Sep. 30, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements In June 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-10, “Development Stage Entities (Topic 915): Elimination of Certain Financial Reporting Requirements, Including an Amendment to Variable Interest Entities Guidance in Topic 810 , Consolidation , ” which amends the consolidation guidance around reporting entities that invest in development stage entities. We adopted the consolidation guidance of this amendment on January 1, 2016 and applied it retrospectively with no material effect on our consolidated results of operations, financial position or cash flows. This ASU did result in certain of our entities being classified as Variable Interest Entities. See Note 10 for discussion of our Variable Interest Entities. In February 2015, the FASB issued ASU No. 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis , ” which makes changes to both the variable interest model and the voting model. These changes required reevaluation of certain entities for consolidation and required us to revise our documentation regarding the consolidation or deconsolidation of such entities. We adopted this standard on January 1, 2016 with no material effect on our consolidated results of operations, financial position or cash flows. In September 2015, the FASB issued ASU No. 2015-16, “Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments , ” to simplify accounting for adjustments made to provisional amounts recognized in a business combination and to eliminate the retrospective accounting for those adjustments. We adopted this standard on January 1, 2016. The adoption of this standard has not had a material impact on our consolidated results of operations, financial position or cash flow. In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842) , ” to improve the financial reporting around leasing transactions. The new guidance requires companies to begin recording assets and liabilities arising from those leases classified as operating leases under previous guidance. Furthermore, the new guidance will require significant additional disclosures about the amount, timing and uncertainty of cash flows from leases. Topic 842 retains a distinction between finance leases and operating leases. The classification criteria for distinguishing between finance leases and operating leases are substantially similar to the classification criteria for distinguishing between capital leases and operating leases in previous guidance. The result of retaining a distinction between finance leases and operating leases is that under the lessee accounting model in Topic 842, the effect of leases in the statement of comprehensive income and the statement of cash flows is largely unchanged from previous guidance. This ASU is effective for us January 1, 2019. We are currently evaluating this ASU and its potential impact on us. In March 2016, the FASB issued ASU No. 2016-05, “Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships , ” which clarifies the hedge accounting impact when there is a change in one of the counterparties to the derivative contract (i.e. novation). This ASU is effective for us January 1, 2017. This ASU is not expected to have a material impact on our consolidated results of operations, financial position or cash flow. In March 2016, the FASB issued ASU No. 2016-06, “Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments , ” which simplifies the embedded derivative analysis for debt instruments containing contingent call or put options. This ASU is effective for us January 1, 2017. This ASU is not expected to have a material impact on our consolidated results of operations, financial position or cash flow. In March 2016, the FASB issued ASU No. 2016-07, “Investments—Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting , ” which eliminates the requirement to apply the equity method of accounting retrospectively when a reporting entity obtains significant influence over a previously held investment. This ASU is effective for us January 1, 2017. We are currently evaluating this ASU and its potential impact on us. In March 2016, the FASB issued ASU No. 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net) , ” to clarify implementation guidance on principal versus agent considerations. This ASU is effective for us on January 1, 2018. We are currently evaluating this ASU and its potential impact on us. In March 2016, the FASB issued ASU No. 2016-09, “Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting , ” which simplifies several aspects of the accounting for share-based payment award transactions. This ASU is effective for us January 1, 2017. We are currently evaluating this ASU and its potential impact on us. In April 2016, the FASB issued ASU No. 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing , ” to clarify implementation guidance on performance obligations and licensing. This ASU is effective for us on January 1, 2018. We are currently evaluating this ASU and its potential impact on us. In May 2016, the FASB issued ASU No. 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients , ” to clarify implementation guidance on assessing collectibility, presentation of sales taxes, noncash consideration, and completed contracts and contract modifications at transition. This ASU is effective for us on January 1, 2018. We are currently evaluating this ASU and its potential impact on us. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , ” to replace the incurred loss impairment methodology with a methodology that reflects expected credit losses and requires the consideration of a broader range of reasonable and supportable information to inform credit loss estimates. This ASU is effective for us on January 1, 2020. We are currently evaluating this ASU and its potential impact on us. In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments , ” to provide guidance on specific cash flow issues with the objective of reducing the existing diversity in practice. This ASU is effective for us on January 1, 2018. We are currently evaluating this ASU and its potential impact on us.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 17, 2016, SEP issued $800 million aggregate principal amount of senior unsecured notes, comprised of $600 million of 3.375% senior notes due 2026 and $200 million of 4.5% senior notes due 2045 . The new 2045 notes are an additional issuance of SEP’s 4.5% senior notes issued in March 2015. Net proceeds from the offering were used to repay a portion of outstanding commercial paper, to fund capital expenditures and for general corporate purposes.

Significant Accounting Policies

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2016
Variable Interest Entity [Line Items]
Use of Estimates, Policy	Use of Estimates. To conform with generally accepted accounting principles (GAAP) in the U.S., 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.
Earnings Per Share, Policy	Basic earnings per common share (EPS) is computed by dividing net income from controlling interests by the weighted-average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income from controlling interests by the diluted weighted-average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock, such as stock options, stock-based performance unit awards and phantom stock awards, were exercised, settled or converted into common stock.
Inventory, Policy	Inventory consists of natural gas held in storage for transmission and processing, and also includes materials and supplies. The NGLs previously included in inventory were disposed of as part of the Empress sale on August 4, 2016. See Note 2 for further discussion related to the sale of Empress. Natural gas inventories primarily relate to the Distribution segment in Canada and are valued at costs approved by the OEB. The difference between the approved price and the actual cost of gas purchased is recorded as either a receivable or a current liability, as appropriate, for future disposition with customers, subject to approval by the OEB. The remaining inventory is recorded at the lower of cost or market, primarily using average cost.
Fair Value Measurement, Policy	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. For interest rate swaps, we utilize data obtained from a third-party source for the determination of fair value. Both the future cash flows for the fixed-leg and floating-leg of our swaps are discounted to present value. In addition, credit default swap rates are used to develop the adjustment for credit risk embedded in our positions. We believe that since some of the inputs and assumptions for the calculations of fair value are derived from observable market data, a Level 2 classification is appropriate. 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 require significant management judgment or estimation. As of September 30, 2016 , there are no financial instruments classified as Level 3. Those reported in Level 3 at December 31, 2015 consisted of NGL revenue swap contracts related to the Empress assets in Western Canada Transmission & Processing, which were disposed of on August 4, 2016. See Note 2 for further discussion related to the sale of Empress. As of December 31, 2015, we reported certain of our NGL basis swaps at fair value using Level 3 inputs due to such derivatives not having observable market prices for substantially the full term of the derivative asset or liability. For valuations that included both observable and unobservable inputs, if the unobservable input was determined to be significant to the overall inputs, the entire valuation was categorized in Level 3. This included derivatives valued using indicative price quotations whose contract length extended into unobservable periods. The fair value of these NGL basis swaps was determined using a discounted cash flow valuation technique based on a forward commodity basis curve. For those derivatives, the primary input to the valuation model was the forward commodity basis curve, which was based on observable or public data sources and extrapolated when observable prices were not available.
Sabal Trail Transmission, LLC
Variable Interest Entity [Line Items]
Consolidation, Variable Interest Entity, Policy [Policy Text Block]	Sabal Trail is a variable interest entity (VIE) due to insufficient equity at risk to finance its activities. We determined that we are the primary beneficiary because we direct the activities of Sabal Trail that most significantly impact its economic performance and we consolidate Sabal Trail in our financial statements.
Nexus Transmission, LLC
Variable Interest Entity [Line Items]
Consolidation, Variable Interest Entity, Policy [Policy Text Block]	Nexus is a VIE due to insufficient equity at risk to finance its activities. We determined that we are not the primary beneficiary because the power to direct the activities of Nexus that most significantly impact its economic performance is shared. Nexus is accounted for under the equity method of accounting.

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Business Segment Data	Business Segment Data Condensed Consolidated Statements of Operations Unaffiliated Revenues Intersegment Revenues Total Operating Revenues Depreciation and Amortization Segment EBITDA/ Consolidated Earnings before Income Taxes (in millions) Three Months Ended September 30, 2016 Spectra Energy Partners $ 628 $ — $ 628 $ 79 $ 464 Distribution 209 — 209 47 77 Western Canada Transmission & Processing 236 — 236 56 93 Field Services — — — — 12 Total reportable segments 1,073 — 1,073 182 646 Other 2 16 18 11 (30 ) Eliminations — (16 ) (16 ) — — Depreciation and amortization — — — — 193 Interest expense — — — — 133 Interest income and other (a) — — — — 1 Total consolidated $ 1,075 $ — $ 1,075 $ 193 $ 291 Three Months Ended September 30, 2015 Spectra Energy Partners $ 612 $ — $ 612 $ 74 $ 488 Distribution 209 — 209 43 70 Western Canada Transmission & Processing 279 9 288 59 117 Field Services — — — — (3 ) Total reportable segments 1,100 9 1,109 176 672 Other 3 16 19 12 (12 ) Eliminations — (25 ) (25 ) — — Depreciation and amortization — — — — 188 Interest expense — — — — 155 Interest income and other (a) — — — — (4 ) Total consolidated $ 1,103 $ — $ 1,103 $ 188 $ 313 Nine Months Ended September 30, 2016 Spectra Energy Partners $ 1,870 $ — $ 1,870 $ 234 $ 1,408 Distribution 958 — 958 138 351 Western Canada Transmission & Processing 784 15 799 173 313 Field Services — — — — 1 Total reportable segments 3,612 15 3,627 545 2,073 Other 6 48 54 37 (85 ) Eliminations — (63 ) (63 ) — — Depreciation and amortization — — — — 582 Interest expense — — — — 437 Interest income and other (a) — — — — 3 Total consolidated $ 3,618 $ — $ 3,618 $ 582 $ 972 Nine Months Ended September 30, 2015 Spectra Energy Partners $ 1,821 $ — $ 1,821 $ 220 $ 1,421 Distribution 1,161 — 1,161 133 360 Western Canada Transmission & Processing 929 33 962 184 382 Field Services — — — — (253 ) Total reportable segments 3,911 33 3,944 537 1,910 Other 7 47 54 37 (39 ) Eliminations — (80 ) (80 ) — — Depreciation and amortization — — — — 574 Interest expense — — — — 480 Interest income and other (a) — — — — (5 ) Total consolidated $ 3,918 $ — $ 3,918 $ 574 $ 812

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Basic and Diluted EPS Calculations	The following table presents our basic and diluted EPS calculations: Three Months Nine Months 2016 2015 2016 2015 (in millions, except per-share amounts) Net income —controlling interests $ 195 $ 174 $ 578 $ 459 Weighted-average common shares outstanding Basic 701 671 692 671 Diluted 703 672 693 672 Basic earnings per common share (a) $ 0.28 $ 0.26 $ 0.84 $ 0.68 Diluted earnings per common share (a) $ 0.28 $ 0.26 $ 0.83 $ 0.68 ___________________ (a) Quarterly earnings per share amounts are stand-alone calculations and may not be additive to full-year amounts due to rounding.

Accumulated Other Comprehensi37

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income	The following table presents the net of tax changes in Accumulated Other Comprehensive Income (AOCI) by component, excluding amounts attributable to noncontrolling interests: Foreign Currency Translation Adjustments Pension Gas Purchase Contract Hedges Other Total Accumulated Other Comprehensive Income (Loss) (in millions) June 30, 2016 $ 425 $ (337 ) $ — $ (2 ) $ 86 Other AOCI activity (78 ) 5 — — (73 ) September 30, 2016 $ 347 $ (332 ) $ — $ (2 ) $ 13 June 30, 2015 $ 617 $ (338 ) $ — $ (3 ) $ 276 Other AOCI activity (345 ) 6 — 1 (338 ) September 30, 2015 $ 272 $ (332 ) $ — $ (2 ) $ (62 ) December 31, 2015 $ 79 $ (346 ) $ (3 ) $ 1 $ (269 ) Other AOCI activity 268 14 3 (3 ) 282 September 30, 2016 $ 347 $ (332 ) $ — $ (2 ) $ 13 December 31, 2014 $ 1,016 $ (351 ) $ (3 ) $ — $ 662 Other AOCI activity (744 ) 19 3 (2 ) (724 ) September 30, 2015 $ 272 $ (332 ) $ — $ (2 ) $ (62 )

Inventory (Tables)

Inventory (Tables)	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
Components of Inventory	The components of inventory are as follows: September 30, December 31, (in millions) Natural gas $ 214 $ 217 NGLs — 23 Materials and supplies 73 67 Total inventory $ 287 $ 307

Investments in and Loans to U39

Investments in and Loans to Unconsolidated Affiliates (Tables)	9 Months Ended
	Sep. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investment, Summarized Financial Information, Income Statement	The following represents summary financial information for DCP Midstream, presented at 100%: Three Months Nine Months 2016 2015 2016 2015 (in millions) Operating revenues $ 1,961 $ 1,851 $ 4,974 $ 5,763 Operating expenses 1,866 1,794 4,823 6,117 Operating income (loss) 95 57 151 (354 ) Net income (loss) 94 25 126 (472 ) Net income (loss) attributable to members’ interests 26 (6 ) 8 (509 )

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2016
Variable Interest Entities [Abstract]
Schedule of Variable Interest Entities	The following table summarizes the assets and liabilities for Sabal Trail: Condensed Consolidated Balance Sheets Caption September 30, December 31, (in millions) Assets Current assets $ 303 $ 118 Net property, plant and equipment 1,363 773 Regulatory assets and deferred debits 58 25 Total Assets $ 1,724 $ 916 Liabilities and Equity Current liabilities $ 128 $ 84 Equity 1,596 832 Total Liabilities and Equity $ 1,724 $ 916

Marketable Securities and Res41

Marketable Securities and Restricted Funds (Tables)	9 Months Ended
	Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Restricted and Nonrestricted AFS Securities by Balance Sheet Classification	AFS Securities. AFS Securities are as follows: Estimated Fair Value September 30, December 31, (in millions) Corporate debt securities (a) $ 20 $ 31 Canadian equity securities (b) 17 — Total available-for-sale securities $ 37 $ 31 ___________________________________ (a) Amounts related to certain construction projects. (b) Amounts related to restricted funds held and collected from customers of Western Canada Transmission & Processing and Express-Platte for Canadian pipeline abandonment in accordance with the NEB’s regulatory requirements. Our AFS securities are classified on the Condensed Consolidated Balance Sheets as follows: Estimated Fair Value September 30, December 31, (in millions) Restricted funds Investments and other assets—other $ 31 $ 11 Non-restricted funds Current assets—other 6 20 Total available-for-sale securities $ 37 $ 31
Estimated Fair Values of Held to Maturity Marketable Securities	HTM Securities. HTM securities are as follows: Estimated Fair Value Description Condensed Consolidated Balance Sheets Caption September 30, December 31, (in millions) Bankers acceptances Current assets—other $ 44 $ 30 Canadian government securities Current assets—other 25 24 Money market securities Current assets—other 8 3 Canadian government securities Investments and other assets—other 52 50 Bankers acceptances Investments and other assets—other — 12 Total held-to-maturity securities $ 129 $ 119

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Available Credit Facilities and Restrictive Debt Covenants	Available Credit Facilities and Restrictive Debt Covenants Expiration Date Total Credit Facilities Capacity Commercial Paper Outstanding at September 30, 2016 Available Credit Facilities Capacity (in millions) Spectra Energy Capital, LLC Multi-year syndicated (a) 2021 $ 1,000 $ 460 $ 540 364-day syndicated (a) 2017 2,000 — 2,000 SEP (b) 2021 2,500 1,177 1,323 Westcoast (c) 2021 305 — 305 Union Gas (d) 2021 533 — 533 Total $ 6,338 $ 1,637 $ 4,701 _________ (a) Revolving credit facilities contain a covenant requiring the Spectra Energy consolidated debt-to-total capitalization ratio, as defined in the agreements, to not exceed 65% . Per the terms of the agreements, collateralized debt is excluded from the calculation of the ratio. This ratio was 55.8% at September 30, 2016 . (b) Revolving credit facility contains a covenant that requires SEP to maintain a ratio of total Consolidated Indebtedness-to-Consolidated EBITDA, as defined in the agreement, of 5.0 to 1 or less. As of September 30, 2016 , this ratio was 3.7 to 1. (c) U.S. dollar equivalent at September 30, 2016 . The revolving credit facility is 400 million Canadian dollars and contains a covenant that requires the Westcoast non-consolidated debt-to-total capitalization ratio to not exceed 75% . The ratio was 31.1% at September 30, 2016 . (d) U.S. dollar equivalent at September 30, 2016 . The revolving credit facility is 700 million Canadian dollars and contains a covenant that requires the Union Gas debt-to-total capitalization ratio to not exceed 75% and a provision which requires Union Gas to repay all borrowings under the facility for a period of two days during the second quarter of each year. The ratio was 68.1% at September 30, 2016 .

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis with Fair Value Hierarchy Levels	The following presents, for each of the fair value hierarchy levels, assets and liabilities that are measured and recorded at fair value on a recurring basis: Description Condensed Consolidated Balance Sheet Caption September 30, 2016 Total Level 1 Level 2 Level 3 (in millions) Corporate debt securities Cash and cash equivalents $ 346 $ — $ 346 $ — Corporate debt securities Current assets—other 6 — 6 — Interest rate swaps Current assets—other 1 — 1 — Corporate debt securities Investments and other assets—other 14 — 14 — Interest rate swaps Investments and other assets—other 55 — 55 — Canadian equity securities Investments and other assets—other 17 17 — — Total Assets $ 439 $ 17 $ 422 $ — Description Condensed Consolidated Balance Sheet Caption December 31, 2015 Total Level 1 Level 2 Level 3 (in millions) Corporate debt securities Cash and cash equivalents $ 137 $ — $ 137 $ — Corporate debt securities Current assets—other 20 — 20 — Commodity derivatives Current assets—other 36 — — 36 Commodity derivatives Investments and other assets—other 5 — — 5 Corporate debt securities Investments and other assets—other 11 — 11 — Interest rate swaps Investments and other assets—other 37 — 37 — Total Assets $ 246 $ — $ 205 $ 41
Changes in Level 3 Assets and Liabilities that are Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs	The following presents changes in Level 3 assets and liabilities that are measured at fair value on a recurring basis using significant unobservable inputs: Three Months Nine Months 2016 2015 2016 2015 (in millions) Derivative assets (liabilities) Fair value, beginning of period $ (2 ) $ 50 $ 41 $ 78 Total gains (losses): Included in earnings 8 18 (7 ) 27 Included in other comprehensive income — (4 ) 1 (9 ) Purchases — (5 ) (1 ) (2 ) Settlements (6 ) (6 ) (34 ) (41 ) Fair value, end of period $ — $ 53 $ — $ 53 Unrealized gains (losses) relating to instruments held at the end of the period $ — $ 5 $ — $ (11 )
Fair Value of Financial Instruments Recorded and Carried at Book Value	The fair values of financial in struments 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. September 30, 2016 December 31, 2015 Book Value Approximate Fair Value Book Value Approximate Fair Value (in millions) Note receivable, noncurrent (a) $ 71 $ 71 $ 71 $ 71 Long-term debt, including current maturities (b) 13,563 15,031 13,567 13,891 __________ (a) Included within Investments in and Loans to Unconsolidated Affiliates. (b) Excludes commercial paper, capital leases, unamortized items and fair value hedge carrying value adjustments.

Risk Management and Hedging A44

Risk Management and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2016
Risk Management And Hedging Activities [Abstract]
Derivative Assets And Liabilities Offsetting	Information about our interest rate swaps that had netting or rights of offset arrangements is as follows: September 30, 2016 December 31, 2015 Gross Amounts Presented in the Condensed Consolidated Balance Sheet Amounts Not Offset in the Condensed Consolidated Balance Sheet Net Amount Gross Amounts Presented in the Condensed Consolidated Balance Sheet Amounts Not Offset in the Condensed Consolidated Balance Sheet Net Amount Description (in millions) Assets $ 56 $ — $ 56 $ 37 $ — $ 37
Commodity Derivative Assets and Liabilities Offsetting	At September 30, 2016, we had no commodity mark-to-market derivatives outstanding. At December 31, 2015, we had commodity mark-to-market derivatives outstanding that had netting or rights of offset arrangements as follows: December 31, 2015 Gross Amounts Gross Amounts Offset Net Amount Presented in the Condensed Consolidated Balance Sheet Description (in millions) Assets $ 104 $ 63 $ 41 Liabilities 63 63 —
Commodity derivative impact	Information regarding the impacts of commodity derivatives on our Condensed Consolidated Statements of Operations is as follows: Three Months Nine Months Derivatives Condensed Consolidated Statements of Operations Caption 2016 2015 2016 2015 (in millions) Commodity derivatives Sales of natural gas liquids $ 8 $ 13 $ (8 ) $ 25

Issuances of SEP Units (Tables)

Issuances of SEP Units (Tables)	9 Months Ended
	Sep. 30, 2016
Noncontrolling Interest [Abstract]
Effects of Issuances of SEP Units	The following table presents the effects of the issuances of SEP units: Three Months Nine Months 2016 2015 2016 2015 (in millions) Net income—controlling interests $ 195 $ 174 $ 578 $ 459 Increase in additional paid-in capital resulting from issuances of SEP units 10 24 25 49 Total net income—controlling interests and changes in equity—controlling interests $ 205 $ 198 $ 603 $ 508

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2016
U.S. and Canada Pension Plans, Defined Benefit
Components of Net Periodic Benefit Cost	Qualified and Non-Qualified Pension Plans—Components of Net Periodic Pension Cost Three Months Nine Months 2016 2015 2016 2015 (in millions) U.S. Service cost benefit earned $ 4 $ 4 $ 14 $ 14 Interest cost on projected benefit obligation 7 6 19 18 Expected return on plan assets (9 ) (10 ) (29 ) (31 ) Amortization of loss 1 2 5 7 Net periodic pension cost $ 3 $ 2 $ 9 $ 8 Canada Service cost benefit earned $ 8 $ 8 $ 23 $ 24 Interest cost on projected benefit obligation 10 11 32 33 Expected return on plan assets (16 ) (16 ) (48 ) (50 ) Amortization of loss 5 6 14 19 Amortization of prior service cost — — 1 1 Net periodic pension cost $ 7 $ 9 $ 22 $ 27
U.S. and Canada Other Post-Retirement Benefits
Components of Net Periodic Benefit Cost	Other Post-Retirement Benefit Plans—Components of Net Periodic Benefit Cost Three Months Nine Months 2016 2015 2016 2015 (in millions) U.S. Service cost benefit earned $ — $ 1 $ — $ 1 Interest cost on accumulated post-retirement benefit obligation 2 1 6 5 Expected return on plan assets (2 ) (1 ) (4 ) (4 ) Net periodic other post-retirement benefit cost $ — $ 1 $ 2 $ 2 Canada Service cost benefit earned $ 1 $ 1 $ 2 $ 3 Interest cost on accumulated post-retirement benefit obligation 1 1 3 3 Net periodic other post-retirement benefit cost $ 2 $ 2 $ 5 $ 6

Condensed Consolidating Finan47

Condensed Consolidating Financial Information (Tables)	9 Months Ended
	Sep. 30, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Statement of Operations	Spectra Energy Corp Condensed Consolidating Statements of Operations (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated Three Months Ended September 30, 2016 Total operating revenues $ — $ — $ 1,076 $ (1 ) $ 1,075 Total operating expenses (5 ) 1 759 (1 ) 754 Operating income (loss) 5 (1 ) 317 — 321 Earnings from equity investments — — 51 — 51 Equity in earnings of consolidated subsidiaries 193 272 — (465 ) — Other income and expenses, net — — 52 — 52 Interest expense — 47 86 — 133 Earnings before income taxes 198 224 334 (465 ) 291 Income tax expense (benefit) 3 31 (24 ) — 10 Net income 195 193 358 (465 ) 281 Net income—noncontrolling interests — — 86 — 86 Net income—controlling interests $ 195 $ 193 $ 272 $ (465 ) $ 195 Three Months Ended September 30, 2015 Total operating revenues $ — $ — $ 1,105 $ (2 ) $ 1,103 Total operating expenses 2 (1 ) 715 (2 ) 714 Operating income (loss) (2 ) 1 390 — 389 Earnings from equity investments — — 48 — 48 Equity in earnings of consolidated subsidiaries 170 307 — (477 ) — Other income and expenses, net — (1 ) 32 — 31 Interest expense — 61 94 — 155 Earnings before income taxes 168 246 376 (477 ) 313 Income tax expense (benefit) (6 ) 76 — — 70 Net income 174 170 376 (477 ) 243 Net income—noncontrolling interests — — 69 — 69 Net income—controlling interests $ 174 $ 170 $ 307 $ (477 ) $ 174 Spectra Energy Corp Condensed Consolidating Statements of Operations (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated Nine Months Ended September 30, 2016 Total operating revenues $ — $ — $ 3,620 $ (2 ) $ 3,618 Total operating expenses — 3 2,431 (2 ) 2,432 Operating income (loss) — (3 ) 1,189 — 1,186 Earnings from equity investments — — 100 — 100 Equity in earnings of consolidated subsidiaries 564 925 — (1,489 ) — Other income and expenses, net (2 ) — 125 — 123 Interest expense — 170 267 — 437 Earnings before income taxes 562 752 1,147 (1,489 ) 972 Income tax expense (benefit) (16 ) 188 (12 ) — 160 Net income 578 564 1,159 (1,489 ) 812 Net income—noncontrolling interests — — 234 — 234 Net income—controlling interests $ 578 $ 564 $ 925 $ (1,489 ) $ 578 Nine Months Ended September 30, 2015 Total operating revenues $ — $ — $ 3,921 $ (3 ) $ 3,918 Total operating expenses 5 (2 ) 2,582 (3 ) 2,582 Operating income (loss) (5 ) 2 1,339 — 1,336 Loss from equity investments — — (117 ) — (117 ) Equity in earnings of consolidated subsidiaries 445 790 — (1,235 ) — Other income and expenses, net — (1 ) 74 — 73 Interest expense — 183 297 — 480 Earnings before income taxes 440 608 999 (1,235 ) 812 Income tax expense (benefit) (19 ) 163 20 — 164 Net income 459 445 979 (1,235 ) 648 Net income—noncontrolling interests — — 189 — 189 Net income—controlling interests $ 459 $ 445 $ 790 $ (1,235 ) $ 459
Condensed Consolidating Statements of Comprehensive Income	Spectra Energy Corp Condensed Consolidating Statements of Comprehensive Income (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated Three Months Ended September 30, 2016 Net income $ 195 $ 193 $ 358 $ (465 ) $ 281 Other comprehensive income (loss) 2 — (77 ) — (75 ) Total comprehensive income, net of tax 197 193 281 (465 ) 206 Less: comprehensive income—noncontrolling interests — — 84 — 84 Comprehensive income—controlling interests $ 197 $ 193 $ 197 $ (465 ) $ 122 Three Months Ended September 30, 2015 Net income $ 174 $ 170 $ 376 $ (477 ) $ 243 Other comprehensive income (loss) 2 1 (346 ) — (343 ) Total comprehensive income (loss), net of tax 176 171 30 (477 ) (100 ) Less: comprehensive income—noncontrolling interests — — 64 — 64 Comprehensive income (loss)—controlling interests $ 176 $ 171 $ (34 ) $ (477 ) $ (164 ) Nine Months Ended September 30, 2016 Net income $ 578 $ 564 $ 1,159 $ (1,489 ) $ 812 Other comprehensive income 4 — 283 — 287 Total comprehensive income, net of tax 582 564 1,442 (1,489 ) 1,099 Less: comprehensive income—noncontrolling interests — — 239 — 239 Comprehensive income—controlling interests $ 582 $ 564 $ 1,203 $ (1,489 ) $ 860 Nine Months Ended September 30, 2015 Net income $ 459 $ 445 $ 979 $ (1,235 ) $ 648 Other comprehensive income (loss) 5 1 (741 ) — (735 ) Total comprehensive income (loss), net of tax 464 446 238 (1,235 ) (87 ) Less: comprehensive income—noncontrolling interests — — 178 — 178 Comprehensive income (loss)—controlling interests $ 464 $ 446 $ 60 $ (1,235 ) $ (265 )
Condensed Consolidating Balance Sheet	Spectra Energy Corp Condensed Consolidating Balance Sheet September 30, 2016 (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated Cash and cash equivalents $ — $ 1 $ 463 $ — $ 464 Receivables—consolidated subsidiaries 19 — — (19 ) — Notes receivable—current—consolidated subsidiaries — — 388 (388 ) — Receivables—other — — 712 — 712 Other current assets 16 2 561 (5 ) 574 Total current assets 35 3 2,124 (412 ) 1,750 Investments in and loans to unconsolidated affiliates — — 2,742 — 2,742 Investments in consolidated subsidiaries 14,844 20,452 — (35,296 ) — Advances receivable—consolidated subsidiaries — 5,064 1,549 (6,613 ) — Notes receivable—consolidated subsidiaries — — 2,800 (2,800 ) — Goodwill — — 4,203 — 4,203 Other assets 38 31 332 — 401 Net property, plant and equipment — — 25,337 — 25,337 Regulatory assets and deferred debits 4 12 1,488 — 1,504 Total Assets $ 14,921 $ 25,562 $ 40,575 $ (45,121 ) $ 35,937 Accounts payable $ 2 $ 3 $ 731 $ — $ 736 Accounts payable—consolidated subsidiaries — 19 — (19 ) — Commercial paper — 460 1,177 — 1,637 Short-term borrowings—consolidated subsidiaries — 388 — (388 ) — Taxes accrued — 4 74 (5 ) 73 Current maturities of long-term debt — — 467 — 467 Other current liabilities 78 45 651 — 774 Total current liabilities 80 919 3,100 (412 ) 3,687 Long-term debt — 2,903 10,191 — 13,094 Advances payable—consolidated subsidiaries 6,613 — — (6,613 ) — Notes payable—consolidated subsidiaries — 2,800 — (2,800 ) — Deferred credits and other liabilities 760 4,096 2,319 — 7,175 Preferred stock of subsidiaries — — 562 — 562 Equity Controlling interests 7,468 14,844 20,452 (35,296 ) 7,468 Noncontrolling interests — — 3,951 — 3,951 Total equity 7,468 14,844 24,403 (35,296 ) 11,419 Total Liabilities and Equity $ 14,921 $ 25,562 $ 40,575 $ (45,121 ) $ 35,937 Spectra Energy Corp Condensed Consolidating Balance Sheet December 31, 2015 (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated Cash and cash equivalents $ — $ 1 $ 212 $ — $ 213 Receivables—consolidated subsidiaries 15 6 13 (34 ) — Notes receivable—current—consolidated subsidiaries — — 387 (387 ) — Receivables—other 2 — 804 — 806 Other current assets 25 — 604 — 629 Total current assets 42 7 2,020 (421 ) 1,648 Investments in and loans to unconsolidated affiliates — — 2,592 — 2,592 Investments in consolidated subsidiaries 13,919 19,161 — (33,080 ) — Advances receivable—consolidated subsidiaries — 5,273 1,326 (6,599 ) — Notes receivable—consolidated subsidiaries — — 2,800 (2,800 ) — Goodwill — — 4,154 — 4,154 Other assets 41 27 242 — 310 Net property, plant and equipment — — 22,918 — 22,918 Regulatory assets and deferred debits 3 3 1,295 — 1,301 Total Assets $ 14,005 $ 24,471 $ 37,347 $ (42,900 ) $ 32,923 Accounts payable $ 2 $ 3 $ 506 $ — $ 511 Accounts payable—consolidated subsidiaries 4 28 2 (34 ) — Commercial paper — 481 631 — 1,112 Short-term borrowings—consolidated subsidiaries — 387 — (387 ) — Taxes accrued 5 — 73 — 78 Current maturities of long-term debt — — 652 — 652 Other current liabilities 102 48 889 — 1,039 Total current liabilities 113 947 2,753 (421 ) 3,392 Long-term debt — 2,891 10,001 — 12,892 Advances payable—consolidated subsidiaries 6,599 — — (6,599 ) — Notes payable—consolidated subsidiaries — 2,800 — (2,800 ) — Deferred credits and other liabilities 767 3,914 2,087 — 6,768 Preferred stock of subsidiaries — — 339 — 339 Equity Controlling interests 6,526 13,919 19,161 (33,080 ) 6,526 Noncontrolling interests — — 3,006 — 3,006 Total equity 6,526 13,919 22,167 (33,080 ) 9,532 Total Liabilities and Equity $ 14,005 $ 24,471 $ 37,347 $ (42,900 ) $ 32,923
Condensed Consolidating Statement of Cash Flows	Spectra Energy Corp Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2016 (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 578 $ 564 $ 1,159 $ (1,489 ) $ 812 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Depreciation and amortization — — 599 — 599 Earnings from equity investments — — (100 ) — (100 ) Equity in earnings of consolidated subsidiaries (564 ) (925 ) — 1,489 — Distributions from equity investments — — 88 — 88 Other (9 ) 194 15 — 200 Net cash provided by (used in) operating activities 5 (167 ) 1,761 — 1,599 CASH FLOWS FROM INVESTING ACTIVITIES Capital expenditures — — (2,407 ) — (2,407 ) Investments in and loans to unconsolidated affiliates — — (181 ) — (181 ) Purchase of intangible, net — — (80 ) — (80 ) Disposition — — 204 — 204 Purchases of held-to-maturity securities — — (479 ) — (479 ) Proceeds from sales and maturities of held-to-maturity securities — — 475 — 475 Purchases of available-for-sale securities — — (565 ) — (565 ) Proceeds from sales and maturities of available-for-sale securities — — 559 — 559 Distributions from equity investments — — 45 — 45 Distribution to equity investment — — (148 ) — (148 ) Advances from (to) affiliates (57 ) 196 — (139 ) — Other changes in restricted funds — — (19 ) — (19 ) Other — — 1 — 1 Net cash provided by (used in) investing activities (57 ) 196 (2,595 ) (139 ) (2,595 ) CASH FLOWS FROM FINANCING ACTIVITIES Proceeds from the issuance of long-term debt — — 382 — 382 Payments for the redemption of long-term debt — — (619 ) — (619 ) Net increase (decrease) in commercial paper — (21 ) 523 — 502 Distributions to noncontrolling interests — — (176 ) — (176 ) Contributions from noncontrolling interests — — 437 — 437 Proceeds from the issuances of Spectra Energy common stock 878 — — — 878 Proceeds from the issuances of SEP common units — — 473 — 473 Proceeds from the issuance of Westcoast preferred stock — — 229 — 229 Dividends paid on common stock (842 ) — — — (842 ) Distributions and advances from (to) affiliates 14 (8 ) (145 ) 139 — Other 2 — (22 ) — (20 ) Net cash provided by (used in) financing activities 52 (29 ) 1,082 139 1,244 Effect of exchange rate changes on cash — — 3 — 3 Net increase in cash and cash equivalents — — 251 — 251 Cash and cash equivalents at beginning of period — 1 212 — 213 Cash and cash equivalents at end of period $ — $ 1 $ 463 $ — $ 464 Spectra Energy Corp Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2015 (Unaudited) (In millions) Spectra Energy Corp Spectra Capital Non-Guarantor Subsidiaries Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 459 $ 445 $ 979 $ (1,235 ) $ 648 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Depreciation and amortization — — 584 — 584 Loss from equity investments — — 117 — 117 Equity in earnings of consolidated subsidiaries (445 ) (790 ) — 1,235 — Distributions from equity investments — — 145 — 145 Other 44 109 176 — 329 Net cash provided by (used in) operating activities 58 (236 ) 2,001 — 1,823 CASH FLOWS FROM INVESTING ACTIVITIES Capital expenditures — — (1,817 ) — (1,817 ) Investments in and loans to unconsolidated — — (91 ) — (91 ) Purchases of held-to-maturity securities — — (463 ) — (463 ) Proceeds from sales and maturities of held-to-maturity securities — — 457 — 457 Proceeds from sales and maturities of available-for-sale securities — — 1 — 1 Distributions from equity investments — — 441 — 441 Advances from (to) affiliates (82 ) 62 — 20 — Other changes in restricted funds — — (24 ) — (24 ) Other — — (7 ) — (7 ) Net cash provided by (used in) investing activities (82 ) 62 (1,503 ) 20 (1,503 ) CASH FLOWS FROM FINANCING ACTIVITIES Proceeds from the issuance of long-term debt — — 1,332 — 1,332 Payments for the redemption of long-term debt — — (153 ) — (153 ) Net increase (decrease) in commercial paper — 170 (1,154 ) — (984 ) Distributions to noncontrolling interests — — (140 ) — (140 ) Contributions from noncontrolling interests — — 164 — 164 Proceeds from the issuances of SEP common units — — 351 — 351 Dividends paid on common stock (747 ) — — — (747 ) Distributions and advances from (to) affiliates 774 4 (758 ) (20 ) — Other (3 ) — (11 ) — (14 ) Net cash provided by (used in) financing activities 24 174 (369 ) (20 ) (191 ) Effect of exchange rate changes on cash — — (6 ) — (6 ) Net increase in cash and cash equivalents — — 123 — 123 Cash and cash equivalents at beginning of period — 1 214 — 215 Cash and cash equivalents at end of period $ — $ 1 $ 337 $ — $ 338

General - Additional Informatio

General - Additional Information (Details)	Sep. 30, 2016
DCP Midstream, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%

General - Business Combination

General - Business Combination (Details) - Enbridge-Spectra Proposed Merger - USD ($) $ / shares in Units, $ in Billions	3 Months Ended	9 Months Ended
	Mar. 31, 2017	Sep. 30, 2016	Sep. 02, 2016
Business Acquisition [Line Items]
Business Acquisition, Share Price Premium			11.50%
Scenario, Forecast
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	43.00%
Enbridge, Inc | Spectra Energy Corp
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement		Sep. 2, 2016
Business Acquisition, Shares Conversion Ratio			0.984
Business Acquisition, Share Price			$ 40.33
Enbridge, Inc | Scenario, Forecast
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	57.00%
Enbridge, Inc | Scenario, Forecast | Spectra Energy Corp
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 28

Dispositions - Additional Infor

Dispositions - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Tax (Expense) Benefit from Provision for (Gain) Loss on Disposal	$ (10)	$ (70)	$ (160)	$ (164)
Empress
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	204		204
Tax (Expense) Benefit from Provision for (Gain) Loss on Disposal			27
Empress | Operating Expense
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Business			(1)
Empress | Current assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	$ 51		$ 51

Business Segments - Additional

Business Segments - Additional Information (Details)	9 Months Ended
	Sep. 30, 2016reportable_segments
Segment Reporting Information [Line Items]
Number of reportable segments	4
DCP Midstream, LLC
Segment Reporting Information [Line Items]
Percentage of ownership interests	50.00%
DCP Midstream, LLC | Phillips Sixty Six
Segment Reporting Information [Line Items]
Percentage of ownership interests	50.00%
DCP Midstream Partners, LP | DCP Midstream, LLC
Segment Reporting Information [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	21.00%

Business Segments Data (Details

Business Segments Data (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenues		$ 1,075	$ 1,103	$ 3,618	$ 3,918
Depreciation and amortization		193	188	582	574
Interest Expense		133	155	437	480
Interest income and other	[1]	1		3
Interest income and other	[1]		(4)		(5)
Earnings Before Income Taxes		291	313	972	812
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues		(16)	(25)	(63)	(80)
Spectra Energy Partners
Segment Reporting Information [Line Items]
Revenues		628	612	1,870	1,821
Depreciation and amortization		79	74	234	220
Earnings Before Interest Taxes Depreciation And Amortization		464	488	1,408	1,421
Spectra Energy Partners | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues		0	0	0	0
Spectra Energy Partners | Operating Segments
Segment Reporting Information [Line Items]
Revenues		628	612	1,870	1,821
Distribution
Segment Reporting Information [Line Items]
Revenues		209	209	958	1,161
Depreciation and amortization		47	43	138	133
Earnings Before Interest Taxes Depreciation And Amortization		77	70	351	360
Distribution | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues		0	0	0	0
Distribution | Operating Segments
Segment Reporting Information [Line Items]
Revenues		209	209	958	1,161
Western Canada Transmission And Processing
Segment Reporting Information [Line Items]
Revenues		236	279	784	929
Depreciation and amortization		56	59	173	184
Earnings Before Interest Taxes Depreciation And Amortization		93	117	313	382
Western Canada Transmission And Processing | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues		0	9	15	33
Western Canada Transmission And Processing | Operating Segments
Segment Reporting Information [Line Items]
Revenues		236	288	799	962
Field Services
Segment Reporting Information [Line Items]
Revenues		0	0	0	0
Depreciation and amortization		0	0	0	0
Earnings Before Interest Taxes Depreciation And Amortization		12	(3)	1	(253)
Field Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues		0	0	0	0
Field Services | Operating Segments
Segment Reporting Information [Line Items]
Revenues		0	0	0	0
Total Reportable Segments
Segment Reporting Information [Line Items]
Revenues		1,073	1,100	3,612	3,911
Depreciation and amortization		182	176	545	537
Earnings Before Interest Taxes Depreciation And Amortization		646	672	2,073	1,910
Total Reportable Segments | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues		0	9	15	33
Total Reportable Segments | Operating Segments
Segment Reporting Information [Line Items]
Revenues		1,073	1,109	3,627	3,944
Other
Segment Reporting Information [Line Items]
Revenues		2	3	6	7
Depreciation and amortization		11	12	37	37
Earnings Before Interest Taxes Depreciation And Amortization		(30)	(12)	(85)	(39)
Other | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues		16	16	48	47
Other | Operating Segments
Segment Reporting Information [Line Items]
Revenues		$ 18	$ 19	$ 54	$ 54
[1]	Includes foreign currency transaction gains and losses related to segment EBITDA

Regulatory Matters (Details)

Regulatory Matters (Details) - Union Gas Limited - Current assets—other - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
2014 Demand Side Management Deferrals
Regulatory Matters [Line Items]
Regulatory Assets	$ 9	$ 8
2015-2020 DSM Plan: 2016 Draft Rate Order
Regulatory Matters [Line Items]
Regulatory Assets	19
2015 Annual Deferrals
Regulatory Matters [Line Items]
Regulatory Assets	$ 18	$ 18

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Contingency [Line Items]
Income Tax Expense	$ 10	$ 70	$ 160	$ 164
Effective Income Tax Rate Reconciliation, Percent	3.00%	22.00%	16.00%	20.00%
Unrecognized Tax Benefits, Period Increase (Decrease)			$ (8)
Minimum
Income Tax Contingency [Line Items]
Potential decrease of unrecognized tax benefits	$ 20		20
Maximum
Income Tax Contingency [Line Items]
Potential decrease of unrecognized tax benefits	$ 25		$ 25
DCP Midstream, LLC | Goodwill Impairment
Income Tax Contingency [Line Items]
Income Tax Expense				$ (74)

Earnings per Common Share - Bas

Earnings per Common Share - Basic and Diluted EPS Calculations (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net Income—Controlling Interests		$ 195	$ 174	$ 578	$ 459
Weighted-average common shares outstanding
Basic		701	671	692	671
Diluted		703	672	693	672
Earnings Per Share, Basic	[1]	$ 0.28	$ 0.26	$ 0.84	$ 0.68
Earnings Per Share, Diluted	[1]	$ 0.28	$ 0.26	$ 0.83	$ 0.68
[1]	Quarterly earnings per share amounts are stand-alone calculations and may not be additive to full-year amounts due to rounding.

Accumulated Other Comprehensi56

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	$ 86	$ 276	$ (269)	$ 662
Other AOCI activity	(73)	(338)	282	(724)
Balance at end of period	13	(62)	13	(62)
Foreign Currency Translation Adjustments
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	425	617	79	1,016
Other AOCI activity	(78)	(345)	268	(744)
Balance at end of period	347	272	347	272
Pension and Post-retirement Benefit Plan Obligations
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(337)	(338)	(346)	(351)
Other AOCI activity	5	6	14	19
Balance at end of period	(332)	(332)	(332)	(332)
Gas Purchase Contract Hedges
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	0	0	(3)	(3)
Other AOCI activity	0	0	3	3
Balance at end of period	0	0	0	0
Other
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(2)	(3)	1	0
Other AOCI activity	0	1	(3)	(2)
Balance at end of period	$ (2)	$ (2)	$ (2)	$ (2)

Inventory - Components of Inven

Inventory - Components of Inventory (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Natural gas	$ 214	$ 217
NGLs	0	23
Materials and supplies	73	67
Total inventory	$ 287	$ 307

Investments in and Loans to U58

Investments in and Loans to Unconsolidated Affiliates -Summarized Financial Information, Income Statement (Details) - DCP Midstream, LLC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 1,961	$ 1,851	$ 4,974	$ 5,763
Operating expenses	1,866	1,794	4,823	6,117
Operating income (loss)	95	57	151	(354)
Net income (loss)	94	25	126	(472)
Net income (loss) attributable to members’ interests	$ 26	$ (6)	$ 8	$ (509)

Investments in and Loans to U59

Investments in and Loans to Unconsolidated Affiliates - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity investments	$ 51			$ 48	$ 100	$ (117)
Goodwill, Impairment Loss					0
Distributions from equity investments					88	145
Distribution to equity investment					$ 148	0
DCP Midstream, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%				50.00%
Gulfstream Natural Gas System, LLC
Schedule of Equity Method Investments [Line Items]
Distributions from equity investments				396
Distribution to equity investment		$ 148	$ 248
Gain from limited partner units issuance | DCP Midstream, LLC
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity investments						2
Goodwill Impairment | DCP Midstream, LLC
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity investments						(123)
DCP Midstream, LLC
Schedule of Equity Method Investments [Line Items]
Goodwill, Impairment Loss						460
Gulfstream Natural Gas System, LLC
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Face Amount				$ 800		$ 800

Variable Interest Entities (Det

Variable Interest Entities (Details) - Sabal Trail Transmission, LLC - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Total Assets	$ 1,724	$ 916
Equity	1,596	832
Total Liabilities and Equity	1,724	916
Current assets
Variable Interest Entity [Line Items]
Total Assets	303	118
Net property, plant and equipment
Variable Interest Entity [Line Items]
Total Assets	1,363	773
Regulatory assets and deferred debits
Variable Interest Entity [Line Items]
Total Assets	58	25
Current liabilities
Variable Interest Entity [Line Items]
Current liabilities	$ 128	$ 84

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Details) - USD ($) $ in Millions	Oct. 01, 2016	Apr. 01, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Variable Interest Entity [Line Items]
Proceeds from Noncontrolling Interests			$ 437	$ 164
Sabal Trail Transmission, LLC
Variable Interest Entity [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage			37.90%
Nexus Transmission, LLC
Variable Interest Entity [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage			37.90%
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount			$ 1,000
Nexus Transmission, LLC | Investments in and loans to unconsolidated affiliates
Variable Interest Entity [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets			$ 281		$ 90
Scenario, Forecast | Sabal Trail Transmission, LLC
Variable Interest Entity [Line Items]
Construction and Development Costs	$ 1,500
Spectra Energy Partners, LP | Sabal Trail Transmission, LLC
Variable Interest Entity [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage			50.00%
NextEra | Spectra Energy Partners, LP | Sabal Trail Transmission, LLC
Variable Interest Entity [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Sale of Interest by Parent		9.50%
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Sale of Interest by Parent		$ 110
Proceeds from Noncontrolling Interests		$ 102

Intangible Asset - Additional I

Intangible Asset - Additional Information (Details) - USD ($) $ in Millions	Apr. 01, 2016	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Purchase of intangible				$ 80	$ 0
Sabal Trail Transmission, LLC
Finite-Lived Intangible Assets [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage				37.90%
Sabal Trail Transmission, LLC | Spectra Energy Partners, LP
Finite-Lived Intangible Assets [Line Items]
Purchase of intangible		$ 40	$ 48
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage				50.00%
NextEra | Sabal Trail Transmission, LLC | Spectra Energy Partners, LP
Finite-Lived Intangible Assets [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Sale of Interest by Parent	9.50%
Intangible Assets, Reimbursement	$ 8
Investments and other assets—other | Sabal Trail Transmission, LLC | Spectra Energy Partners, LP
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		$ 80		$ 80
Finite-Lived Intangible Asset, Useful Life				25 years

Goodwill (Details)

Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Impairment Loss	$ 0

Marketable Securities and Res64

Marketable Securities and Restricted Funds Schedule of Restricted and Non-restricted Available for Sale Securities (Details) - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		$ 37	$ 31
Investments and other assets—other
Schedule of Available-for-sale Securities [Line Items]
Restricted funds, Investments and other assets - other		31	11
Current assets—other
Schedule of Available-for-sale Securities [Line Items]
Non-restricted funds, Current assets - other		6	20
Corporate Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	[1]	20	31
Canadian Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	[2]	$ 17	$ 0
[1]	Amounts related to certain construction projects.
[2]	Amounts related to restricted funds held and collected from customers of Western Canada Transmission & Processing and Express-Platte for Canadian pipeline abandonment in accordance with the NEB’s regulatory requirements.

Marketable Securities and Res65

Marketable Securities and Restricted Funds Schedule of Restricted and Non-restricted Available for Sale Securities - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gain (Loss)	$ 0	$ 0
Available-for-sale Securities [Member] | Maximum
Schedule of Available-for-sale Securities [Line Items]
Weighted Average Contractual Maturity Of Outstanding Securities	1 year

Marketable Securities and Res66

Marketable Securities and Restricted Funds Schedule of Held to Maturity Securities (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Total held-to-maturity securities	$ 129	$ 119
Current assets—other | Bankers Acceptance
Schedule of Held-to-maturity Securities [Line Items]
Total held-to-maturity securities	44	30
Current assets—other | Canadian Government Securities
Schedule of Held-to-maturity Securities [Line Items]
Total held-to-maturity securities	25	24
Current assets—other | Money Market Funds
Schedule of Held-to-maturity Securities [Line Items]
Total held-to-maturity securities	8	3
Investments and other assets—other | Bankers Acceptance
Schedule of Held-to-maturity Securities [Line Items]
Total held-to-maturity securities	0	12
Investments and other assets—other | Canadian Government Securities
Schedule of Held-to-maturity Securities [Line Items]
Total held-to-maturity securities	$ 52	$ 50

Marketable Securities and Res67

Marketable Securities and Restricted Funds Schedule of Held to Maturity Securities - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Unrecognized Holding Gain	$ 0	$ 0
Held-to-maturity Securities, Unrecognized Holding Loss	$ 0	$ 0
M&N Canada six point nine zero percent senior secured notes due 2014 to 2019 | Maritimes & Northeast Pipeline Limited Partnership
Schedule of Held-to-maturity Securities [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.90%
Held-to-maturity Securities [Member] | Maximum
Schedule of Held-to-maturity Securities [Line Items]
Weighted Average Contractual Maturity Of Outstanding Securities	1 year

Marketable Securities and Res68

Marketable Securities and Restricted Funds Schedule of Other Restricted Funds - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current assets—other
Gain (Loss) on Investments [Line Items]
Restricted Cash and Cash Equivalents, Current	$ 25	$ 11
Investments and other assets—other
Gain (Loss) on Investments [Line Items]
Restricted Cash and Cash Equivalents, Noncurrent	43	38
Cash received for Green Investment Fund | Current assets—other
Gain (Loss) on Investments [Line Items]
Restricted Cash and Cash Equivalents, Current	13
Cash received for Green Investment Fund | Investments and other assets—other
Gain (Loss) on Investments [Line Items]
Restricted Cash and Cash Equivalents, Noncurrent	19
Amounts restricted for insurance purposes | Current assets—other
Gain (Loss) on Investments [Line Items]
Restricted Cash and Cash Equivalents, Current	12	11
Canadian Pipeline Abandonment Requirement | Investments and other assets—other
Gain (Loss) on Investments [Line Items]
Restricted Cash and Cash Equivalents, Noncurrent	17	24
Project Costs | Investments and other assets—other
Gain (Loss) on Investments [Line Items]
Restricted Cash and Cash Equivalents, Noncurrent	$ 7	$ 14

Debt and Credit Facilities Avai

Debt and Credit Facilities Available Credit Facilities and Restrictive Debt Covenants (Details) CAD in Millions, $ in Millions		9 Months Ended
		Sep. 30, 2016CAD	Sep. 30, 2016USD ($)		Dec. 31, 2015USD ($)
Line of Credit Facility [Line Items]
Total Credit Facilities Capacity			$ 6,338
Commercial Paper Outstanding			1,637		$ 1,112
Available Credit Facilities Capacity			4,701
Spectra Energy Partners, LP
Line of Credit Facility [Line Items]
Line Of Credit Facility Maturity Year	[1]	2,021
Total Credit Facilities Capacity	[1]		2,500
Commercial Paper Outstanding	[1]		1,177
Available Credit Facilities Capacity	[1]		1,323
Westcoast Energy Inc.
Line of Credit Facility [Line Items]
Line Of Credit Facility Maturity Year	[2]	2,021
Total Credit Facilities Capacity		CAD 400	305	[2]
Commercial Paper Outstanding	[2]		0
Available Credit Facilities Capacity	[2]		305
Union Gas Limited
Line of Credit Facility [Line Items]
Line Of Credit Facility Maturity Year	[3]	2,021
Total Credit Facilities Capacity		CAD 700	533	[3]
Commercial Paper Outstanding	[3]		0
Available Credit Facilities Capacity	[3]		533
Multi Year Syndicated | Spectra Energy Capital, LLC
Line of Credit Facility [Line Items]
Line Of Credit Facility Maturity Year	[4]	2,021
Total Credit Facilities Capacity	[4]		1,000
Commercial Paper Outstanding	[4]		460
Available Credit Facilities Capacity	[4]		540
364-day syndicated | Spectra Energy Capital, LLC
Line of Credit Facility [Line Items]
Line Of Credit Facility Maturity Year	[4]	2,017
Total Credit Facilities Capacity	[4]		2,000
Commercial Paper Outstanding	[4]		0
Available Credit Facilities Capacity	[4]		$ 2,000
[1]	Revolving credit facility contains a covenant that requires SEP to maintain a ratio of total Consolidated Indebtedness-to-Consolidated EBITDA, as defined in the agreement, of 5.0 to 1 or less. As of September 30, 2016, this ratio was 3.7 to 1.
[2]	U.S. dollar equivalent at September 30, 2016. The revolving credit facility is 400 million Canadian dollars and contains a covenant that requires the Westcoast non-consolidated debt-to-total capitalization ratio to not exceed 75%. The ratio was 31.1% at September 30, 2016.
[3]	U.S. dollar equivalent at September 30, 2016. The revolving credit facility is 700 million Canadian dollars and contains a covenant that requires the Union Gas debt-to-total capitalization ratio to not exceed 75% and a provision which requires Union Gas to repay all borrowings under the facility for a period of two days during the second quarter of each year. The ratio was 68.1% at September 30, 2016.
[4]	Revolving credit facilities contain a covenant requiring the Spectra Energy consolidated debt-to-total capitalization ratio, as defined in the agreements, to not exceed 65%. Per the terms of the agreements, collateralized debt is excluded from the calculation of the ratio. This ratio was 55.8% at September 30, 2016.

Debt and Credit Facilities Av70

Debt and Credit Facilities Available Credit Facilities and Restrictive Debt Covenants - Table Footnotes (Details) CAD in Millions, $ in Millions	Sep. 30, 2016CAD	Sep. 30, 2016USD ($)
Line of Credit Facility [Line Items]
Total Credit Facilities Capacity		$ 6,338
Spectra Energy Partners, LP
Line of Credit Facility [Line Items]
Total Credit Facilities Capacity		2,500	[1]
Westcoast Energy Inc.
Line of Credit Facility [Line Items]
Total Credit Facilities Capacity	CAD 400	305	[2]
Union Gas Limited
Line of Credit Facility [Line Items]
Total Credit Facilities Capacity	CAD 700	$ 533	[3]
Covenant Requirement | Spectra Energy Capital, LLC
Line of Credit Facility [Line Items]
Debt to Total Capitalization	55.80%	55.80%
Covenant Requirement | Spectra Energy Capital, LLC | Maximum
Line of Credit Facility [Line Items]
Debt to Total Capitalization	65.00%	65.00%
Covenant Requirement | Spectra Energy Partners, LP
Line of Credit Facility [Line Items]
Debt To Adjusted EBITDA Ratio Maximum	5	5
Debt To Adjusted EBITDA Ratio	3.7	3.7
Covenant Requirement | Westcoast Energy Inc.
Line of Credit Facility [Line Items]
Debt to Total Capitalization	31.10%	31.10%
Covenant Requirement | Westcoast Energy Inc. | Maximum
Line of Credit Facility [Line Items]
Debt to Total Capitalization	75.00%	75.00%
Covenant Requirement | Union Gas Limited
Line of Credit Facility [Line Items]
Debt to Total Capitalization	68.10%	68.10%
Covenant Requirement | Union Gas Limited | Maximum
Line of Credit Facility [Line Items]
Debt to Total Capitalization	75.00%	75.00%
[1]	Revolving credit facility contains a covenant that requires SEP to maintain a ratio of total Consolidated Indebtedness-to-Consolidated EBITDA, as defined in the agreement, of 5.0 to 1 or less. As of September 30, 2016, this ratio was 3.7 to 1.
[2]	U.S. dollar equivalent at September 30, 2016. The revolving credit facility is 400 million Canadian dollars and contains a covenant that requires the Westcoast non-consolidated debt-to-total capitalization ratio to not exceed 75%. The ratio was 31.1% at September 30, 2016.
[3]	U.S. dollar equivalent at September 30, 2016. The revolving credit facility is 700 million Canadian dollars and contains a covenant that requires the Union Gas debt-to-total capitalization ratio to not exceed 75% and a provision which requires Union Gas to repay all borrowings under the facility for a period of two days during the second quarter of each year. The ratio was 68.1% at September 30, 2016.

Debt and Credit Facilities Av71

Debt and Credit Facilities Available Credit Facilities and Restrictive Debt Covenants - Additional Information (Details) CAD in Millions		May 31, 2016CAD	Sep. 30, 2016CAD	Sep. 30, 2016USD ($)		May 31, 2016USD ($)
Line of Credit Facility [Line Items]
Total Credit Facilities Capacity				$ 6,338,000,000
Line of Credit Facility, Covenant Compliance			Our credit agreements contain various covenants, including the maintenance of certain financial ratios. Failure to meet those covenants beyond applicable grace periods could result in accelerated due dates and/or termination of the agreements. As of September 30, 2016, we were in compliance with those covenants.
Union Gas Limited
Line of Credit Facility [Line Items]
Total Credit Facilities Capacity			CAD 700	533,000,000	[1]
Line Of Credit Facility Maturity Year	[1]		2,021
Union Gas Limited | Union Gas Two Point Eight One Percent Senior Unsecured Notes Due 2026 [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount		CAD 250				$ 191,000,000
Debt Instrument, Interest Rate, Stated Percentage		2.81%				2.81%
Debt Instrument, Maturity Year		2,026
Union Gas Limited | Union Gas Three Point Eight Zero Percent Senior Unsecured Notes Due 2026 [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount		CAD 250				$ 191,000,000
Debt Instrument, Interest Rate, Stated Percentage		3.80%				3.80%
Debt Instrument, Maturity Year		2,046
Spectra Energy Partners, LP
Line of Credit Facility [Line Items]
Total Credit Facilities Capacity	[2]			2,500,000,000
Line Of Credit Facility Maturity Year	[2]		2,021
Westcoast Energy Inc.
Line of Credit Facility [Line Items]
Total Credit Facilities Capacity			CAD 400	305,000,000	[3]
Line Of Credit Facility Maturity Year	[3]		2,021
364-day syndicated | Spectra Energy Capital, LLC
Line of Credit Facility [Line Items]
Total Credit Facilities Capacity	[4]			2,000,000,000
Line Of Credit Facility Maturity Year	[4]		2,017
Multi Year Syndicated | Spectra Energy Capital, LLC
Line of Credit Facility [Line Items]
Total Credit Facilities Capacity	[4]			1,000,000,000
Line Of Credit Facility Maturity Year	[4]		2,021
Letter of Credit
Line of Credit Facility [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding				0
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding				$ 0
[1]	U.S. dollar equivalent at September 30, 2016. The revolving credit facility is 700 million Canadian dollars and contains a covenant that requires the Union Gas debt-to-total capitalization ratio to not exceed 75% and a provision which requires Union Gas to repay all borrowings under the facility for a period of two days during the second quarter of each year. The ratio was 68.1% at September 30, 2016.
[2]	Revolving credit facility contains a covenant that requires SEP to maintain a ratio of total Consolidated Indebtedness-to-Consolidated EBITDA, as defined in the agreement, of 5.0 to 1 or less. As of September 30, 2016, this ratio was 3.7 to 1.
[3]	U.S. dollar equivalent at September 30, 2016. The revolving credit facility is 400 million Canadian dollars and contains a covenant that requires the Westcoast non-consolidated debt-to-total capitalization ratio to not exceed 75%. The ratio was 31.1% at September 30, 2016.
[4]	Revolving credit facilities contain a covenant requiring the Spectra Energy consolidated debt-to-total capitalization ratio, as defined in the agreements, to not exceed 65%. Per the terms of the agreements, collateralized debt is excluded from the calculation of the ratio. This ratio was 55.8% at September 30, 2016.

Preferred Stock of Subsidiari72

Preferred Stock of Subsidiaries (Details) shares in Millions, CAD in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2016CADshares	Sep. 30, 2016USD ($)shares	Sep. 30, 2015USD ($)
Class of Stock [Line Items]
Proceeds from the issuance of Westcoast Energy Inc. preferred stock | $		$ 229	$ 0
Westcoast Energy Inc.
Class of Stock [Line Items]
Cumulative 5-year minimum rate reset redeemable first preferred shares series 12 | shares	12	12
Proceeds from the issuance of Westcoast Energy Inc. preferred stock	CAD 300	$ 229

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis with Fair Value Hierarchy Levels (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	$ 439	$ 246
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	17	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	422	205
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0	41
Cash and cash equivalents | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	346	137
Cash and cash equivalents | Level 1 | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Cash and cash equivalents | Level 2 | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	346	137
Cash and cash equivalents | Level 3 | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Current assets—other | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	6	20
Current assets—other | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	1
Current assets—other | Commodity Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring		36
Current assets—other | Level 1 | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Current assets—other | Level 1 | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0
Current assets—other | Level 1 | Commodity Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring		0
Current assets—other | Level 2 | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	6	20
Current assets—other | Level 2 | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	1
Current assets—other | Level 2 | Commodity Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring		0
Current assets—other | Level 3 | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Current assets—other | Level 3 | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0
Current assets—other | Level 3 | Commodity Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring		36
Investments and other assets—other | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	14	11
Investments and other assets—other | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	55	37
Investments and other assets—other | Canadian Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	17
Investments and other assets—other | Commodity Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring		5
Investments and other assets—other | Level 1 | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Investments and other assets—other | Level 1 | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Investments and other assets—other | Level 1 | Canadian Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	17
Investments and other assets—other | Level 1 | Commodity Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring		0
Investments and other assets—other | Level 2 | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	14	11
Investments and other assets—other | Level 2 | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	55	37
Investments and other assets—other | Level 2 | Canadian Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0
Investments and other assets—other | Level 2 | Commodity Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring		0
Investments and other assets—other | Level 3 | Corporate Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Investments and other assets—other | Level 3 | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Investments and other assets—other | Level 3 | Canadian Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring	$ 0
Investments and other assets—other | Level 3 | Commodity Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure, Recurring		$ 5

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Level 3 Assets and Liabilities that are Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs (Details) - Derivative Financial Instruments, Assets - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Total realized/unrealized gains (losses):
Fair value, beginning of period	$ (2)	$ 50	$ 41	$ 78
Included in earnings	8	18	(7)	27
Included in other comprehensive income	0	(4)	1	(9)
Purchases	0	(5)	(1)	(2)
Settlements	(6)	(6)	(34)	(41)
Fair value, end of period	0	53	0	53
Unrealized gains (losses) relating to instruments held at the end of the period	$ 0	$ 5	$ 0	$ (11)

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Financial Instruments Recorded and Carried at Book Value (Details) - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Note receivable, noncurrent	[1]	$ 71	$ 71
Long-term Debt	[2]	13,563	13,567
Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Note receivable, noncurrent	[1]	71	71
Long-term Debt, Fair Value	[2]	$ 15,031	$ 13,891
[1]	Included within Investments in and Loans to Unconsolidated Affiliates.
[2]	Excludes commercial paper, capital leases, unamortized items and fair value hedge carrying value adjustments

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Assets, Fair Value Disclosure, Nonrecurring, Period Increase (Decrease)	$ 0	$ 0
Liabilities, Fair Value Disclosure, Nonrecurring, Period Increase (Decrease)	$ 0	$ 0

Risk Management and Hedging A77

Risk Management and Hedging Activities - Additional Information (Details) gal in Millions, $ in Billions	9 Months Ended
	Sep. 30, 2016USD ($)gal
Pay Floating Receive Fixed Swaps
Derivative [Line Items]
Notional principal amount of interest rate swaps | $	$ 2
Commodity Derivatives
Derivative [Line Items]
Underlying, Derivative Volume | gal	0

Risk Management and Hedging A78

Risk Management and Hedging Activities - Information about Interest Rate Swaps (Details) - Interest rate swaps - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Gross Amounts Presented in the Condensed Consolidated Balance Sheets, Assets	$ 56	$ 37
Amounts Not Offset in the Condensed Consolidated Balance Sheets, Assets	0	0
Net Amount	$ 56	$ 37

Risk Management and Hedging A79

Risk Management and Hedging Activities - Commodity derivative assets and liabilities offsetting (Details) - Commodity Derivatives - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative Assets And Liabilities Offsetting Table Text Block [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 0	$ 104
Derivative Asset, Fair Value, Amount Offset Against Liabilities	0	63
Net Amounts Presented in the Condensed Consolidated Balance Sheet, Assets	0	41
Derivative Liability, Fair Value, Gross Liability	0	63
Derivative Liability, Fair Value, Amount Offset Against Assets	0	63
Net Amounts Presented in the Condensed Consolidated Balance Sheets, Liabilities	$ 0	$ 0

Risk Management and Hedging A80

Risk Management and Hedging Activities - Commodity derivative impact (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commodity Derivatives | Sales of natural gas liquids
Commodity derivative impact [Line Items]
Sales of natural gas liquids	$ 8	$ 13	$ (8)	$ 25

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Loss Contingency, Estimate of Possible Loss	$ 0	$ 0

Guarantees and Indemnificatio82

Guarantees and Indemnifications - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
Duke Energy Indemnified Guarantees
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 406
Duke Energy Indemnified Guarantees Expiring in 2028
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 201
Guarantor Obligations, Term	2,028
Duke/Fluor Daniel | Fluor Enterprises
Guarantor Obligations [Line Items]
Percentage of Fluor Enterprises Inc. ownership in D/FD	50.00%
Westcoast Energy Inc.
Guarantor Obligations [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%

Issuances of Common Stock - Add

Issuances of Common Stock - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	9 Months Ended
	Apr. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Mar. 01, 2016
Class of Stock [Line Items]
Spectra Energy common stock issued		$ 878	$ 2
SE Corp At-the-Market program
Class of Stock [Line Items]
Equity Distribution Agreement - Maximum Aggregate Offering Price				$ 500
Spectra Energy common stock issued, shares		12.9
Spectra Energy common stock issued		$ 383
Overnight equity offering
Class of Stock [Line Items]
Spectra Energy common stock issued, shares	16.1
Spectra Energy common stock issued	$ 479
Spectra Energy Partners, LP | Spectra Energy Corp | Limited Partner | Private Placement
Class of Stock [Line Items]
Spectra Energy purchase of SEP's common units	10.4

Issuances of SEP Units - Effect

Issuances of SEP Units - Effects of Issuances (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Noncontrolling Interest [Line Items]
Net Income—Controlling Interests	$ 195	$ 174	$ 578	$ 459
Increase in additional paid-in capital resulting from issuances of SEP units			457	330
Total net income—controlling interests and changes in equity—controlling interests	205	198	603	508
Additional Paid-in Capital
Noncontrolling Interest [Line Items]
Increase in additional paid-in capital resulting from issuances of SEP units	$ 10	$ 24	$ 25	$ 49

Issuances of SEP Units - Additi

Issuances of SEP Units - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Related Party Transaction [Line Items]
Proceeds from the issuances of Spectra Energy Partners, LP common units				$ 473	$ 351
Increase in additional paid-in capital resulting from issuances of SEP units				457	330
Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Proceeds from the issuances of Spectra Energy Partners, LP common units				483
Additional Paid-in Capital
Related Party Transaction [Line Items]
Increase in additional paid-in capital resulting from issuances of SEP units		$ 10	$ 24	25	49
Noncontrolling Interests
Related Party Transaction [Line Items]
Increase in additional paid-in capital resulting from issuances of SEP units				$ 432	$ 281
Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Percentage ownership by parent before equity issuance						78.00%
Percentage ownership by parent after equity issuance				76.00%
Spectra Energy Partners, LP | Additional Paid-in Capital
Related Party Transaction [Line Items]
Gain in Additional Paid in Capital from SEP unit issuance				$ 40
Increase in additional paid-in capital resulting from issuances of SEP units				25
Spectra Energy Partners, LP | Noncontrolling Interests
Related Party Transaction [Line Items]
Increase in additional paid-in capital resulting from issuances of SEP units				$ 432
SEP At-the-Market program | Limited Partner | Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Spectra Energy purchase of SEP's common units				10,400,000
SEP At-the-Market program | General Partner | Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Spectra Energy purchase of SEP's common units				212,000
Private Placement | Spectra Energy Corp | Limited Partner | Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Spectra Energy purchase of SEP's common units	10,400,000
Private Placement | Spectra Energy Corp | General Partner | Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Spectra Energy purchase of SEP's common units	200,000

Employee Benefit Plans - Other

Employee Benefit Plans - Other Post Retirement Benefit Plans Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost benefit earned	$ 4	$ 4	$ 14	$ 14
Interest cost on benefit obligation	7	6	19	18
Expected return on plan assets	(9)	(10)	(29)	(31)
Amortization of loss	1	2	5	7
Net periodic cost	3	2	9	8
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost benefit earned	8	8	23	24
Interest cost on benefit obligation	10	11	32	33
Expected return on plan assets	(16)	(16)	(48)	(50)
Amortization of loss	5	6	14	19
Amortization of prior service cost	0	0	1	1
Net periodic cost	7	9	22	27
U.S. Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost benefit earned	0	1	0	1
Interest cost on benefit obligation	2	1	6	5
Expected return on plan assets	(2)	(1)	(4)	(4)
Net periodic cost	0	1	2	2
Canadian Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost benefit earned	1	1	2	3
Interest cost on benefit obligation	1	1	3	3
Net periodic cost	$ 2	$ 2	$ 5	$ 6

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			6.00%
Expensed pre-tax employer matching contributions	$ 4	$ 4	$ 11	$ 11
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			5.00%
Expensed pre-tax employer matching contributions	$ 3	$ 2	$ 9	8
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans			16	16
Anticipated contributions to the defined benefit plans in 2016			22
Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Contribution to retirement plans			20	$ 23
Anticipated contributions to the defined benefit plans in 2016			$ 26

Condensed Consolidating Finan88

Condensed Consolidating Financial Information Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Financial Statements, Captions [Line Items]
Total operating revenues	$ 1,075	$ 1,103	$ 3,618	$ 3,918
Total operating expenses	754	714	2,432	2,582
Operating Income	321	389	1,186	1,336
Earnings (loss) from equity investments	51	48	100	(117)
Equity in earnings of consolidated subsidiaries	0	0	0	0
Other income and expenses, net	52	31	123	73
Interest expense	133	155	437	480
Earnings Before Income Taxes	291	313	972	812
Income Tax Expense (Benefit)	10	70	160	164
Net Income	281	243	812	648
Net Income—Noncontrolling Interests	86	69	234	189
Net Income—Controlling Interests	195	174	578	459
Eliminations
Condensed Financial Statements, Captions [Line Items]
Total operating revenues	(1)	(2)	(2)	(3)
Total operating expenses	(1)	(2)	(2)	(3)
Operating Income	0	0	0	0
Earnings (loss) from equity investments	0	0	0	0
Equity in earnings of consolidated subsidiaries	(465)	(477)	(1,489)	(1,235)
Other income and expenses, net	0	0	0	0
Interest expense	0	0	0	0
Earnings Before Income Taxes	(465)	(477)	(1,489)	(1,235)
Income Tax Expense (Benefit)	0	0	0	0
Net Income	(465)	(477)	(1,489)	(1,235)
Net Income—Noncontrolling Interests	0	0	0	0
Net Income—Controlling Interests	(465)	(477)	(1,489)	(1,235)
Spectra Energy Corp
Condensed Financial Statements, Captions [Line Items]
Total operating revenues	0	0	0	0
Total operating expenses	(5)	2	0	5
Operating Income	5	(2)	0	(5)
Earnings (loss) from equity investments	0	0	0	0
Equity in earnings of consolidated subsidiaries	193	170	564	445
Other income and expenses, net	0	0	(2)	0
Interest expense	0	0	0	0
Earnings Before Income Taxes	198	168	562	440
Income Tax Expense (Benefit)	3	(6)	(16)	(19)
Net Income	195	174	578	459
Net Income—Noncontrolling Interests	0	0	0	0
Net Income—Controlling Interests	195	174	578	459
Spectra Energy Capital, LLC
Condensed Financial Statements, Captions [Line Items]
Total operating revenues	0	0	0	0
Total operating expenses	1	(1)	3	(2)
Operating Income	(1)	1	(3)	2
Earnings (loss) from equity investments	0	0	0	0
Equity in earnings of consolidated subsidiaries	272	307	925	790
Other income and expenses, net	0	(1)	0	(1)
Interest expense	47	61	170	183
Earnings Before Income Taxes	224	246	752	608
Income Tax Expense (Benefit)	31	76	188	163
Net Income	193	170	564	445
Net Income—Noncontrolling Interests	0	0	0	0
Net Income—Controlling Interests	193	170	564	445
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total operating revenues	1,076	1,105	3,620	3,921
Total operating expenses	759	715	2,431	2,582
Operating Income	317	390	1,189	1,339
Earnings (loss) from equity investments	51	48	100	(117)
Equity in earnings of consolidated subsidiaries	0	0	0	0
Other income and expenses, net	52	32	125	74
Interest expense	86	94	267	297
Earnings Before Income Taxes	334	376	1,147	999
Income Tax Expense (Benefit)	(24)	0	(12)	20
Net Income	358	376	1,159	979
Net Income—Noncontrolling Interests	86	69	234	189
Net Income—Controlling Interests	$ 272	$ 307	$ 925	$ 790

Condensed Consolidating Finan89

Condensed Consolidating Financial Information Condensed Consolidating Statements of Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Financial Statements, Captions [Line Items]
Net Income	$ 281	$ 243	$ 812	$ 648
Other comprehensive income (loss)	(75)	(343)	287	(735)
Total Comprehensive Income (Loss), net of tax	206	(100)	1,099	(87)
Less: Comprehensive Income—Noncontrolling Interests	84	64	239	178
Comprehensive Income (Loss)—Controlling Interests	122	(164)	860	(265)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net Income	(465)	(477)	(1,489)	(1,235)
Other comprehensive income (loss)	0	0	0	0
Total Comprehensive Income (Loss), net of tax	(465)	(477)	(1,489)	(1,235)
Less: Comprehensive Income—Noncontrolling Interests	0	0	0	0
Comprehensive Income (Loss)—Controlling Interests	(465)	(477)	(1,489)	(1,235)
Spectra Energy Corp
Condensed Financial Statements, Captions [Line Items]
Net Income	195	174	578	459
Other comprehensive income (loss)	2	2	4	5
Total Comprehensive Income (Loss), net of tax	197	176	582	464
Less: Comprehensive Income—Noncontrolling Interests	0	0	0	0
Comprehensive Income (Loss)—Controlling Interests	197	176	582	464
Spectra Energy Capital, LLC
Condensed Financial Statements, Captions [Line Items]
Net Income	193	170	564	445
Other comprehensive income (loss)	0	1	0	1
Total Comprehensive Income (Loss), net of tax	193	171	564	446
Less: Comprehensive Income—Noncontrolling Interests	0	0	0	0
Comprehensive Income (Loss)—Controlling Interests	193	171	564	446
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net Income	358	376	1,159	979
Other comprehensive income (loss)	(77)	(346)	283	(741)
Total Comprehensive Income (Loss), net of tax	281	30	1,442	238
Less: Comprehensive Income—Noncontrolling Interests	84	64	239	178
Comprehensive Income (Loss)—Controlling Interests	$ 197	$ (34)	$ 1,203	$ 60

Condensed Consolidating Finan90

Condensed Consolidating Financial Information Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 464	$ 213	$ 338	$ 215
Receivables-consolidated subsidiaries	0	0
Notes receivable-current-consolidated subsidiaries	0	0
Receivables-other	712	806
Other current assets	574	629
Total current assets	1,750	1,648
Noncurrent Assets
Investments in and loans to unconsolidated affiliates	2,742	2,592
Investments in consolidated subsidiaries	0	0
Advances receivable-consolidated subsidiaries	0	0
Notes receivable-consolidated subsidiaries	0	0
Goodwill	4,203	4,154
Other assets	401	310
Net property, plant and equipment	25,337	22,918
Regulatory assets and deferred debits	1,504	1,301
Total Assets	35,937	32,923
Current Liabilities
Accounts payable	736	511
Accounts payable-consolidated subsidiaries	0	0
Commercial paper	1,637	1,112
Short-term borrowings-consolidated subsidiaries	0	0
Taxes accrued	73	78
Current maturities of long-term debt	467	652
Other current liabilities	774	1,039
Total current liabilities	3,687	3,392
Noncurrent Liabilities
Long-term debt	13,094	12,892
Advances payable-consolidated subsidiaries	0	0
Notes payable-consolidated subsidiaries	0	0
Deferred credits and other liabilities	7,175	6,768
Preferred stock of subsidiaries	562	339
Equity
Controlling interests	7,468	6,526
Noncontrolling interests	3,951	3,006
Total equity	11,419	9,532	9,931	10,398
Total Liabilities and Equity	35,937	32,923
Eliminations
Current Assets
Cash and cash equivalents	0	0	0	0
Receivables-consolidated subsidiaries	(19)	(34)
Notes receivable-current-consolidated subsidiaries	(388)	(387)
Receivables-other	0	0
Other current assets	(5)	0
Total current assets	(412)	(421)
Noncurrent Assets
Investments in and loans to unconsolidated affiliates	0	0
Investments in consolidated subsidiaries	(35,296)	(33,080)
Advances receivable-consolidated subsidiaries	(6,613)	(6,599)
Notes receivable-consolidated subsidiaries	(2,800)	(2,800)
Goodwill	0	0
Other assets	0	0
Net property, plant and equipment	0	0
Regulatory assets and deferred debits	0	0
Total Assets	(45,121)	(42,900)
Current Liabilities
Accounts payable	0	0
Accounts payable-consolidated subsidiaries	(19)	(34)
Commercial paper	0	0
Short-term borrowings-consolidated subsidiaries	(388)	(387)
Taxes accrued	(5)	0
Current maturities of long-term debt	0	0
Other current liabilities	0	0
Total current liabilities	(412)	(421)
Noncurrent Liabilities
Long-term debt	0	0
Advances payable-consolidated subsidiaries	(6,613)	(6,599)
Notes payable-consolidated subsidiaries	(2,800)	(2,800)
Deferred credits and other liabilities	0	0
Preferred stock of subsidiaries	0	0
Equity
Controlling interests	(35,296)	(33,080)
Noncontrolling interests	0	0
Total equity	(35,296)	(33,080)
Total Liabilities and Equity	(45,121)	(42,900)
Spectra Energy Corp
Current Assets
Cash and cash equivalents	0	0	0	0
Receivables-consolidated subsidiaries	19	15
Notes receivable-current-consolidated subsidiaries	0	0
Receivables-other	0	2
Other current assets	16	25
Total current assets	35	42
Noncurrent Assets
Investments in and loans to unconsolidated affiliates	0	0
Investments in consolidated subsidiaries	14,844	13,919
Advances receivable-consolidated subsidiaries	0	0
Notes receivable-consolidated subsidiaries	0	0
Goodwill	0	0
Other assets	38	41
Net property, plant and equipment	0	0
Regulatory assets and deferred debits	4	3
Total Assets	14,921	14,005
Current Liabilities
Accounts payable	2	2
Accounts payable-consolidated subsidiaries	0	4
Commercial paper	0	0
Short-term borrowings-consolidated subsidiaries	0	0
Taxes accrued	0	5
Current maturities of long-term debt	0	0
Other current liabilities	78	102
Total current liabilities	80	113
Noncurrent Liabilities
Long-term debt	0	0
Advances payable-consolidated subsidiaries	6,613	6,599
Notes payable-consolidated subsidiaries	0	0
Deferred credits and other liabilities	760	767
Preferred stock of subsidiaries	0	0
Equity
Controlling interests	7,468	6,526
Noncontrolling interests	0	0
Total equity	7,468	6,526
Total Liabilities and Equity	14,921	14,005
Spectra Energy Capital, LLC
Current Assets
Cash and cash equivalents	1	1	1	1
Receivables-consolidated subsidiaries	0	6
Notes receivable-current-consolidated subsidiaries	0	0
Receivables-other	0	0
Other current assets	2	0
Total current assets	3	7
Noncurrent Assets
Investments in and loans to unconsolidated affiliates	0	0
Investments in consolidated subsidiaries	20,452	19,161
Advances receivable-consolidated subsidiaries	5,064	5,273
Notes receivable-consolidated subsidiaries	0	0
Goodwill	0	0
Other assets	31	27
Net property, plant and equipment	0	0
Regulatory assets and deferred debits	12	3
Total Assets	25,562	24,471
Current Liabilities
Accounts payable	3	3
Accounts payable-consolidated subsidiaries	19	28
Commercial paper	460	481
Short-term borrowings-consolidated subsidiaries	388	387
Taxes accrued	4	0
Current maturities of long-term debt	0	0
Other current liabilities	45	48
Total current liabilities	919	947
Noncurrent Liabilities
Long-term debt	2,903	2,891
Advances payable-consolidated subsidiaries	0	0
Notes payable-consolidated subsidiaries	2,800	2,800
Deferred credits and other liabilities	4,096	3,914
Preferred stock of subsidiaries	0	0
Equity
Controlling interests	14,844	13,919
Noncontrolling interests	0	0
Total equity	14,844	13,919
Total Liabilities and Equity	25,562	24,471
Non-Guarantor Subsidiaries
Current Assets
Cash and cash equivalents	463	212	$ 337	$ 214
Receivables-consolidated subsidiaries	0	13
Notes receivable-current-consolidated subsidiaries	388	387
Receivables-other	712	804
Other current assets	561	604
Total current assets	2,124	2,020
Noncurrent Assets
Investments in and loans to unconsolidated affiliates	2,742	2,592
Investments in consolidated subsidiaries	0	0
Advances receivable-consolidated subsidiaries	1,549	1,326
Notes receivable-consolidated subsidiaries	2,800	2,800
Goodwill	4,203	4,154
Other assets	332	242
Net property, plant and equipment	25,337	22,918
Regulatory assets and deferred debits	1,488	1,295
Total Assets	40,575	37,347
Current Liabilities
Accounts payable	731	506
Accounts payable-consolidated subsidiaries	0	2
Commercial paper	1,177	631
Short-term borrowings-consolidated subsidiaries	0	0
Taxes accrued	74	73
Current maturities of long-term debt	467	652
Other current liabilities	651	889
Total current liabilities	3,100	2,753
Noncurrent Liabilities
Long-term debt	10,191	10,001
Advances payable-consolidated subsidiaries	0	0
Notes payable-consolidated subsidiaries	0	0
Deferred credits and other liabilities	2,319	2,087
Preferred stock of subsidiaries	562	339
Equity
Controlling interests	20,452	19,161
Noncontrolling interests	3,951	3,006
Total equity	24,403	22,167
Total Liabilities and Equity	$ 40,575	$ 37,347

Condensed Consolidating Finan91

Condensed Consolidating Financial Information Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 281		$ 243	$ 812	$ 648
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization				599	584
(Earnings) loss from equity investments	(51)		(48)	(100)	117
Equity in earnings of consolidated subsidiaries	0		0	0	0
Distributions from equity investments				88	145
Other				200	329
Net cash provided by (used in) operating activities				1,599	1,823
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures				(2,407)	(1,817)
Investments in and loans to unconsolidated affiliates				(181)	(91)
Purchase of intangible, net				(80)	0
Disposition				204	0
Purchases of held-to-maturity securities				(479)	(463)
Proceeds from sales and maturities of held-to-maturity securities				475	457
Purchases of available-for-sale securities				(565)	0
Proceeds from sales and maturities of available-for-sale securities				559	1
Distributions from equity investments				45	441
Distribution to equity investment				(148)	0
Advances from (to) affiliates				0	0
Other changes in restricted funds				(19)	(24)
Other				1	(7)
Net cash provided by (used in) investing activities				(2,595)	(1,503)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt				382	1,332
Payments for the redemption of long-term debt				(619)	(153)
Net increase (decrease) in commercial paper				502	(984)
Distributions to noncontrolling interests				(176)	(140)
Contributions from noncontrolling interests				437	164
Proceeds from the issuances of Spectra Energy common stock				878	0
Proceeds from the issuances of Spectra Energy Partners, LP common units				473	351
Proceeds from the issuance of Westcoast Energy Inc. preferred stock				229	0
Dividends paid on common stock				(842)	(747)
Distributions and advances from (to) affiliates				0	0
Other				(20)	(14)
Net cash provided by (used in) financing activities				1,244	(191)
Effect of exchange rate changes on cash				3	(6)
Net increase in cash and cash equivalents				251	123
Cash and cash equivalents at beginning of period		$ 338		213	215
Cash and cash equivalents at end of period	464	213	338	464	338
Eliminations
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	(465)		(477)	(1,489)	(1,235)
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization				0	0
(Earnings) loss from equity investments	0		0	0	0
Equity in earnings of consolidated subsidiaries	465		477	1,489	1,235
Distributions from equity investments				0	0
Other				0	0
Net cash provided by (used in) operating activities				0	0
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures				0	0
Investments in and loans to unconsolidated affiliates				0	0
Purchase of intangible, net				0
Disposition				0
Purchases of held-to-maturity securities				0	0
Proceeds from sales and maturities of held-to-maturity securities				0	0
Purchases of available-for-sale securities				0
Proceeds from sales and maturities of available-for-sale securities				0	0
Distributions from equity investments				0	0
Distribution to equity investment				0
Advances from (to) affiliates				(139)	20
Other changes in restricted funds				0	0
Other				0	0
Net cash provided by (used in) investing activities				(139)	20
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt				0	0
Payments for the redemption of long-term debt				0	0
Net increase (decrease) in commercial paper				0	0
Distributions to noncontrolling interests				0	0
Contributions from noncontrolling interests				0	0
Proceeds from the issuances of Spectra Energy common stock				0
Proceeds from the issuances of Spectra Energy Partners, LP common units				0	0
Proceeds from the issuance of Westcoast Energy Inc. preferred stock				0
Dividends paid on common stock				0	0
Distributions and advances from (to) affiliates				139	(20)
Other				0	0
Net cash provided by (used in) financing activities				139	(20)
Effect of exchange rate changes on cash				0	0
Net increase in cash and cash equivalents				0	0
Cash and cash equivalents at beginning of period		0		0	0
Cash and cash equivalents at end of period	0	0	0	0	0
Spectra Energy Corp
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	195		174	578	459
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization				0	0
(Earnings) loss from equity investments	0		0	0	0
Equity in earnings of consolidated subsidiaries	(193)		(170)	(564)	(445)
Distributions from equity investments				0	0
Other				(9)	44
Net cash provided by (used in) operating activities				5	58
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures				0	0
Investments in and loans to unconsolidated affiliates				0	0
Purchase of intangible, net				0
Disposition				0
Purchases of held-to-maturity securities				0	0
Proceeds from sales and maturities of held-to-maturity securities				0	0
Purchases of available-for-sale securities				0
Proceeds from sales and maturities of available-for-sale securities				0	0
Distributions from equity investments				0	0
Distribution to equity investment				0
Advances from (to) affiliates				(57)	(82)
Other changes in restricted funds				0	0
Other				0	0
Net cash provided by (used in) investing activities				(57)	(82)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt				0	0
Payments for the redemption of long-term debt				0	0
Net increase (decrease) in commercial paper				0	0
Distributions to noncontrolling interests				0	0
Contributions from noncontrolling interests				0	0
Proceeds from the issuances of Spectra Energy common stock				878
Proceeds from the issuances of Spectra Energy Partners, LP common units				0	0
Proceeds from the issuance of Westcoast Energy Inc. preferred stock				0
Dividends paid on common stock				(842)	(747)
Distributions and advances from (to) affiliates				14	774
Other				2	(3)
Net cash provided by (used in) financing activities				52	24
Effect of exchange rate changes on cash				0	0
Net increase in cash and cash equivalents				0	0
Cash and cash equivalents at beginning of period		0		0	0
Cash and cash equivalents at end of period	0	0	0	0	0
Spectra Energy Capital, LLC
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	193		170	564	445
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization				0	0
(Earnings) loss from equity investments	0		0	0	0
Equity in earnings of consolidated subsidiaries	(272)		(307)	(925)	(790)
Distributions from equity investments				0	0
Other				194	109
Net cash provided by (used in) operating activities				(167)	(236)
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures				0	0
Investments in and loans to unconsolidated affiliates				0	0
Purchase of intangible, net				0
Disposition				0
Purchases of held-to-maturity securities				0	0
Proceeds from sales and maturities of held-to-maturity securities				0	0
Purchases of available-for-sale securities				0
Proceeds from sales and maturities of available-for-sale securities				0	0
Distributions from equity investments				0	0
Distribution to equity investment				0
Advances from (to) affiliates				196	62
Other changes in restricted funds				0	0
Other				0	0
Net cash provided by (used in) investing activities				196	62
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt				0	0
Payments for the redemption of long-term debt				0	0
Net increase (decrease) in commercial paper				(21)	170
Distributions to noncontrolling interests				0	0
Contributions from noncontrolling interests				0	0
Proceeds from the issuances of Spectra Energy common stock				0
Proceeds from the issuances of Spectra Energy Partners, LP common units				0	0
Proceeds from the issuance of Westcoast Energy Inc. preferred stock				0
Dividends paid on common stock				0	0
Distributions and advances from (to) affiliates				(8)	4
Other				0	0
Net cash provided by (used in) financing activities				(29)	174
Effect of exchange rate changes on cash				0	0
Net increase in cash and cash equivalents				0	0
Cash and cash equivalents at beginning of period		1		1	1
Cash and cash equivalents at end of period	1	1	1	1	1
Non-Guarantor Subsidiaries
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	358		376	1,159	979
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization				599	584
(Earnings) loss from equity investments	(51)		(48)	(100)	117
Equity in earnings of consolidated subsidiaries	0		0	0	0
Distributions from equity investments				88	145
Other				15	176
Net cash provided by (used in) operating activities				1,761	2,001
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures				(2,407)	(1,817)
Investments in and loans to unconsolidated affiliates				(181)	(91)
Purchase of intangible, net				(80)
Disposition				204
Purchases of held-to-maturity securities				(479)	(463)
Proceeds from sales and maturities of held-to-maturity securities				475	457
Purchases of available-for-sale securities				(565)
Proceeds from sales and maturities of available-for-sale securities				559	1
Distributions from equity investments				45	441
Distribution to equity investment				(148)
Advances from (to) affiliates				0	0
Other changes in restricted funds				(19)	(24)
Other				1	(7)
Net cash provided by (used in) investing activities				(2,595)	(1,503)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt				382	1,332
Payments for the redemption of long-term debt				(619)	(153)
Net increase (decrease) in commercial paper				523	(1,154)
Distributions to noncontrolling interests				(176)	(140)
Contributions from noncontrolling interests				437	164
Proceeds from the issuances of Spectra Energy common stock				0
Proceeds from the issuances of Spectra Energy Partners, LP common units				473	351
Proceeds from the issuance of Westcoast Energy Inc. preferred stock				229
Dividends paid on common stock				0	0
Distributions and advances from (to) affiliates				(145)	(758)
Other				(22)	(11)
Net cash provided by (used in) financing activities				1,082	(369)
Effect of exchange rate changes on cash				3	(6)
Net increase in cash and cash equivalents				251	123
Cash and cash equivalents at beginning of period		337		212	214
Cash and cash equivalents at end of period	$ 463	$ 212	$ 337	$ 463	$ 337

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event - Spectra Energy Partners, LP $ in Millions	Oct. 17, 2016USD ($)
Subsequent Event [Line Items]
Debt Instrument, Face Amount	$ 800
SEP 3.375% Senior Unsecured Notes Due 2026
Subsequent Event [Line Items]
Debt Instrument, Face Amount	$ 600
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Debt Instrument, Maturity Year	2,026
SEP 4.5% Senior Unsecured Notes Due 2045
Subsequent Event [Line Items]
Debt Instrument, Face Amount	$ 200
Debt Instrument, Interest Rate, Stated Percentage	4.50%
Debt Instrument, Maturity Year	2,045