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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statements of Cash Flow (Details) $ in Millions, $ in Billions | 12 Months Ended
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Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash provided by/(used in) operating activities | $ 10,502 |  | $ 6,658 | $ 5,205
Investing activities |  |  |  |
Capital expenditures | (6,806) |  | (8,287) | (5,128)
Long-term investments | (1,312) |  | (3,586) | (514)
Distributions from equity investments in excess of cumulative earnings | 1,277 |  | 125 | 0
Additions to intangible assets | (540) |  | (789) | (127)
Acquisitions | 0 |  | 0 | (644)
Cash acquired in Merger Transaction | 0 |  | 682 | 0
Proceeds from dispositions | 4,452 |  | 628 | 1,379
Reimbursement of capital expenditures | 0 |  | 212 | 0
Contributions to subsidiaries | 0 |  | 0 | 0
Return of share capital from subsidiaries | 0 |  | 0 | 0
Advances to affiliates | 0 |  | 0 | 0
Repayment of advances to affiliates | 0 |  | 0 | 0
Other | (88) |  | (22) | (118)
Net cash used in investing activities | (3,017) |  | (11,037) | (5,152)
Financing activities |  |  |  |
Net change in short-term borrowings | (420) |  | 721 | (248)
Net change in commercial paper and credit facility draws | (2,256) |  | (1,249) | (2,297)
Debenture and term note issues, net of issue costs | 3,537 |  | 9,483 | 4,080
Debenture and term note repayments | (4,445) |  | (5,054) | (1,946)
Sale of noncontrolling interests in subsidiaries | 1,289 |  | 0 | 0
Purchase of interest in consolidated subsidiary | 0 |  | (227) | 0
Contributions from noncontrolling interests | 24 |  | 832 | 28
Distributions to noncontrolling interests | (857) |  | (919) | (720)
Contributions from redeemable noncontrolling interests | 70 |  | 1,178 | 591
Distributions to redeemable noncontrolling interests | (325) |  | (247) | (202)
Contributions from parents | 0 |  | 0 | 0
Distributions to parents | 0 |  | 0 | 0
Preference shares issued | 0 |  | 489 | 737
Sponsored Vehicle buy-in cash payment | (64) |  | 0 | 0
Redemption of preferred shares | (210) |  | 0 | 0
Common shares issued | 21 | $ 0.0 | 1,549 | 2,260
Preference share dividends | (364) |  | (330) | (293)
Common share dividends | (3,480) |  | (2,750) | (1,150)
Advances from affiliates | 0 |  | 0 | 0
Repayment of advances from affiliates | 0 |  | 0 | 0
Other | (23) |  | 0 | 0
Net cash (used in)/provided by financing activities | (7,503) |  | 3,476 | 840
Effect of translation of foreign denominated cash and cash equivalents and restricted cash | 68 |  | (72) | (19)
Net increase/(decrease) in cash and cash equivalents and restricted cash | 50 |  | (975) | 874
Cash and cash equivalents and restricted cash at beginning of year | 587 |  | 1,562 | 688
Cash and cash equivalents and restricted cash at end of year | 637 |  | 587 | 1,562
Consolidation, Eliminations |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash provided by/(used in) operating activities | (2,847) |  | (1,794) | (1,491)
Investing activities |  |  |  |
Capital expenditures | 0 |  | 0 | 0
Long-term investments | 78 |  | 202 | 194
Distributions from equity investments in excess of cumulative earnings | (3,900) |  | (3,355) | (3,950)
Additions to intangible assets | 0 |  | 0 | 0
Acquisitions |  |  |  | 0
Cash acquired in Merger Transaction |  |  | 0 |
Proceeds from dispositions | 0 |  | (2,217) | 0
Reimbursement of capital expenditures |  |  | 0 |
Contributions to subsidiaries | 9,878 |  | 6,922 | 1,433
Return of share capital from subsidiaries | (3,753) |  | (3,955) | (350)
Advances to affiliates | 13,425 |  | 12,094 | 7,448
Repayment of advances to affiliates | (14,747) |  | (9,522) | (3,359)
Other | 0 |  | 0 | 0
Net cash used in investing activities | 981 |  | 169 | 1,416
Financing activities |  |  |  |
Net change in short-term borrowings | 0 |  | 0 | 0
Net change in commercial paper and credit facility draws | 0 |  | 0 | 0
Debenture and term note issues, net of issue costs | 0 |  | 0 | 0
Debenture and term note repayments | 0 |  | 0 | 0
Sale of noncontrolling interests in subsidiaries | 1,289 |  |  |
Purchase of interest in consolidated subsidiary |  |  | 2,217 |
Contributions from noncontrolling interests | 24 |  | 832 | 28
Distributions to noncontrolling interests | (857) |  | (919) | (720)
Contributions from redeemable noncontrolling interests | 70 |  | 615 | 591
Distributions to redeemable noncontrolling interests | (325) |  | (247) | (202)
Contributions from parents | (9,230) |  | (6,922) | (1,433)
Distributions to parents | 10,221 |  | 10,086 | 5,900
Preference shares issued |  |  | 0 | 0
Sponsored Vehicle buy-in cash payment | 0 |  |  |
Redemption of preferred shares | 0 |  | 0 |
Common shares issued | (648) |  | (1,873) | 0
Preference share dividends | 0 |  | 478 | 0
Common share dividends | 0 |  | 0 | 0
Advances from affiliates | (13,425) |  | (12,094) | (7,448)
Repayment of advances from affiliates | 14,747 |  | 9,522 | 3,359
Other | 0 |  |  |
Net cash (used in)/provided by financing activities | 1,866 |  | 1,695 | 75
Effect of translation of foreign denominated cash and cash equivalents and restricted cash | 0 |  | (70) | 0
Net increase/(decrease) in cash and cash equivalents and restricted cash | 0 |  | 0 | 0
Cash and cash equivalents and restricted cash at beginning of year | 0 |  | 0 | 0
Cash and cash equivalents and restricted cash at end of year | 0 |  | 0 | 0
Parent Issuer and Guarantor | Reportable Legal Entities |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash provided by/(used in) operating activities | 154 |  | (1,023) | (65)
Investing activities |  |  |  |
Capital expenditures | (28) |  | (21) | (21)
Long-term investments | (81) |  | (202) | (194)
Distributions from equity investments in excess of cumulative earnings | 1,829 |  | 1,448 | 1,233
Additions to intangible assets | (43) |  | (47) | (37)
Acquisitions |  |  |  | 0
Cash acquired in Merger Transaction |  |  | 0 |
Proceeds from dispositions | 1,790 |  | 0 | 0
Reimbursement of capital expenditures |  |  | 0 |
Contributions to subsidiaries | (8,131) |  | (4,866) | (970)
Return of share capital from subsidiaries | 3,753 |  | 2,423 | 350
Advances to affiliates | (6,863) |  | (7,145) | (4,307)
Repayment of advances to affiliates | 9,427 |  | 4,506 | 1,577
Other | 0 |  | 0 | 0
Net cash used in investing activities | 1,653 |  | (3,904) | (2,369)
Financing activities |  |  |  |
Net change in short-term borrowings | 0 |  | 0 | 0
Net change in commercial paper and credit facility draws | (734) |  | (1,845) | (1,083)
Debenture and term note issues, net of issue costs | 2,554 |  | 8,177 | 3,009
Debenture and term note repayments | 0 |  | (1,711) | (1,160)
Sale of noncontrolling interests in subsidiaries | 0 |  |  |
Purchase of interest in consolidated subsidiary |  |  | 0 |
Contributions from noncontrolling interests | 0 |  | 0 | 0
Distributions to noncontrolling interests | 0 |  | 0 | 0
Contributions from redeemable noncontrolling interests | 0 |  | 563 | 0
Distributions to redeemable noncontrolling interests | 0 |  | 0 | 0
Contributions from parents | 0 |  | 0 | 0
Distributions to parents | 0 |  | 0 | 0
Preference shares issued |  |  | 489 | 737
Sponsored Vehicle buy-in cash payment | (64) |  |  |
Redemption of preferred shares | 0 |  | 0 |
Common shares issued | 21 |  | 1,549 | 2,260
Preference share dividends | (364) |  | (330) | (293)
Common share dividends | (3,480) |  | (2,336) | (1,150)
Advances from affiliates | 710 |  | 407 | 518
Repayment of advances from affiliates | (443) |  | (40) | (400)
Other | 0 |  |  |
Net cash (used in)/provided by financing activities | (1,800) |  | 4,923 | 2,438
Effect of translation of foreign denominated cash and cash equivalents and restricted cash | 0 |  | 0 | 0
Net increase/(decrease) in cash and cash equivalents and restricted cash | 7 |  | (4) | 4
Cash and cash equivalents and restricted cash at beginning of year | 2 |  | 6 | 2
Cash and cash equivalents and restricted cash at end of year | 9 |  | 2 | 6
Subsidiary Non-Guarantors | Reportable Legal Entities |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash provided by/(used in) operating activities | 12,772 |  | 11,411 | 8,579
Investing activities |  |  |  |
Capital expenditures | (6,778) |  | (8,266) | (5,107)
Long-term investments | (1,297) |  | (3,535) | (514)
Distributions from equity investments in excess of cumulative earnings | 1,232 |  | 103 | 0
Additions to intangible assets | (497) |  | (742) | (90)
Acquisitions |  |  |  | (644)
Cash acquired in Merger Transaction |  |  | 682 |
Proceeds from dispositions | 2,662 |  | 1,103 | 1,379
Reimbursement of capital expenditures |  |  | 212 |
Contributions to subsidiaries | (1,655) |  | 0 | 0
Return of share capital from subsidiaries | 0 |  | 0 | 0
Advances to affiliates | (4,859) |  | (3,020) | (1,518)
Repayment of advances to affiliates | 3,298 |  | 2,887 | 400
Other | (88) |  | (22) | (135)
Net cash used in investing activities | (7,982) |  | (10,598) | (6,229)
Financing activities |  |  |  |
Net change in short-term borrowings | (420) |  | 721 | (248)
Net change in commercial paper and credit facility draws | 449 |  | (1,314) | (1,503)
Debenture and term note issues, net of issue costs | 983 |  | 438 | 1,071
Debenture and term note repayments | (3,288) |  | (2,810) | (386)
Sale of noncontrolling interests in subsidiaries | 0 |  |  |
Purchase of interest in consolidated subsidiary |  |  | (1,969) |
Contributions from noncontrolling interests | 0 |  | 0 | 0
Distributions to noncontrolling interests | 0 |  | 0 | 0
Contributions from redeemable noncontrolling interests | 0 |  | 0 | 0
Distributions to redeemable noncontrolling interests | 0 |  | 0 | 0
Contributions from parents | 8,223 |  | 6,922 | 1,433
Distributions to parents | (7,653) |  | (7,310) | (4,840)
Preference shares issued |  |  | 0 | 0
Sponsored Vehicle buy-in cash payment | 0 |  |  |
Redemption of preferred shares | (210) |  | 1,613 |
Common shares issued | 0 |  | 0 | 0
Preference share dividends | 0 |  | 0 | 0
Common share dividends | 0 |  | (414) | 0
Advances from affiliates | 8,566 |  | 9,074 | 5,930
Repayment of advances from affiliates | (11,449) |  | (6,635) | (2,959)
Other | (18) |  |  |
Net cash (used in)/provided by financing activities | (4,817) |  | (1,684) | (1,502)
Effect of translation of foreign denominated cash and cash equivalents and restricted cash | 68 |  | 0 | (20)
Net increase/(decrease) in cash and cash equivalents and restricted cash | 41 |  | (871) | 828
Cash and cash equivalents and restricted cash at beginning of year | 571 |  | 1,442 | 630
Cash and cash equivalents and restricted cash at end of year | 612 |  | 571 | 1,442
Spectra Energy Partners L P | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash provided by/(used in) operating activities | 1,751 |  | (255) |
Investing activities |  |  |  |
Capital expenditures | 0 |  | 0 |
Long-term investments | (12) |  | (51) |
Distributions from equity investments in excess of cumulative earnings | 45 |  | 22 |
Additions to intangible assets | 0 |  | 0 |
Cash acquired in Merger Transaction |  |  | 0 |
Proceeds from dispositions | 0 |  | 0 |
Reimbursement of capital expenditures |  |  | 0 |
Contributions to subsidiaries | (79) |  | 0 |
Return of share capital from subsidiaries | 0 |  | 0 |
Advances to affiliates | 0 |  | (519) |
Repayment of advances to affiliates | 518 |  | 0 |
Other | 0 |  | 0 |
Net cash used in investing activities | 472 |  | (548) |
Financing activities |  |  |  |
Net change in short-term borrowings | 0 |  | 0 |
Net change in commercial paper and credit facility draws | (962) |  | 2,226 |
Debenture and term note issues, net of issue costs | 0 |  | 868 |
Debenture and term note repayments | (648) |  | (533) |
Sale of noncontrolling interests in subsidiaries | 0 |  |  |
Purchase of interest in consolidated subsidiary |  |  | 0 |
Contributions from noncontrolling interests | 0 |  | 0 |
Distributions to noncontrolling interests | 0 |  | 0 |
Contributions from redeemable noncontrolling interests | 0 |  | 0 |
Distributions to redeemable noncontrolling interests | 0 |  | 0 |
Contributions from parents | 0 |  | 0 |
Distributions to parents | (1,902) |  | (1,987) |
Preference shares issued |  |  | 0 |
Sponsored Vehicle buy-in cash payment | 0 |  |  |
Redemption of preferred shares | 0 |  | 0 |
Common shares issued | 648 |  | 227 |
Preference share dividends | 0 |  | 0 |
Common share dividends | 0 |  | 0 |
Advances from affiliates | 648 |  | 0 |
Repayment of advances from affiliates | 0 |  | 0 |
Other | (5) |  |  |
Net cash (used in)/provided by financing activities | (2,221) |  | 801 |
Effect of translation of foreign denominated cash and cash equivalents and restricted cash | 0 |  | 0 |
Net increase/(decrease) in cash and cash equivalents and restricted cash | 2 |  | (2) |
Cash and cash equivalents and restricted cash at beginning of year | 14 |  | 16 |
Cash and cash equivalents and restricted cash at end of year | 16 |  | 14 | 16
Enbridge Energy Partners, L.P. | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash provided by/(used in) operating activities | (1,328) |  | (1,681) | (1,818)
Investing activities |  |  |  |
Capital expenditures | 0 |  | 0 | 0
Long-term investments | 0 |  | 0 | 0
Distributions from equity investments in excess of cumulative earnings | 2,071 |  | 1,907 | 2,717
Additions to intangible assets | 0 |  | 0 | 0
Acquisitions |  |  |  | 0
Cash acquired in Merger Transaction |  |  | 0 |
Proceeds from dispositions | 0 |  | 1,742 | 0
Reimbursement of capital expenditures |  |  | 0 |
Contributions to subsidiaries | (13) |  | (2,056) | (463)
Return of share capital from subsidiaries | 0 |  | 1,532 | 0
Advances to affiliates | (1,703) |  | (1,410) | (1,623)
Repayment of advances to affiliates | 1,504 |  | 2,129 | 1,382
Other | 0 |  | 0 | 17
Net cash used in investing activities | 1,859 |  | 3,844 | 2,030
Financing activities |  |  |  |
Net change in short-term borrowings | 0 |  | 0 | 0
Net change in commercial paper and credit facility draws | (1,009) |  | (316) | 289
Debenture and term note issues, net of issue costs | 0 |  | 0 | 0
Debenture and term note repayments | (509) |  | 0 | (400)
Sale of noncontrolling interests in subsidiaries | 0 |  |  |
Purchase of interest in consolidated subsidiary |  |  | (475) |
Contributions from noncontrolling interests | 0 |  | 0 | 0
Distributions to noncontrolling interests | 0 |  | 0 | 0
Contributions from redeemable noncontrolling interests | 0 |  | 0 | 0
Distributions to redeemable noncontrolling interests | 0 |  | 0 | 0
Contributions from parents | 1,007 |  | 0 | 0
Distributions to parents | (666) |  | (789) | (1,060)
Preference shares issued |  |  | 0 | 0
Sponsored Vehicle buy-in cash payment | 0 |  |  |
Redemption of preferred shares | 0 |  | (1,613) |
Common shares issued | 0 |  | 1,646 | 0
Preference share dividends | 0 |  | (478) | 0
Common share dividends | 0 |  | 0 | 0
Advances from affiliates | 3,501 |  | 2,613 | 1,000
Repayment of advances from affiliates | (2,855) |  | (2,847) | 0
Other | 0 |  |  |
Net cash (used in)/provided by financing activities | (531) |  | (2,259) | (171)
Effect of translation of foreign denominated cash and cash equivalents and restricted cash | 0 |  | (2) | 1
Net increase/(decrease) in cash and cash equivalents and restricted cash | 0 |  | (98) | 42
Cash and cash equivalents and restricted cash at beginning of year | 0 |  | 98 | 56
Cash and cash equivalents and restricted cash at end of year | $ 0 |  | 0 | 98
Previously Reported |  |  |  |
Financing activities |  |  |  |
Cash and cash equivalents and restricted cash at beginning of year |  |  | 1,562 |
Cash and cash equivalents and restricted cash at end of year |  |  |  | 1,562
Previously Reported | Consolidation, Eliminations |  |  |  |
Financing activities |  |  |  |
Cash and cash equivalents and restricted cash at beginning of year |  |  | 0 |
Cash and cash equivalents and restricted cash at end of year |  |  |  | 0
Previously Reported | Parent Issuer and Guarantor | Reportable Legal Entities |  |  |  |
Financing activities |  |  |  |
Cash and cash equivalents and restricted cash at beginning of year |  |  | 6 |
Cash and cash equivalents and restricted cash at end of year |  |  |  | 6
Previously Reported | Subsidiary Non-Guarantors | Reportable Legal Entities |  |  |  |
Financing activities |  |  |  |
Cash and cash equivalents and restricted cash at beginning of year |  |  | 1,458 |
Cash and cash equivalents and restricted cash at end of year |  |  |  | 1,458
Previously Reported | Enbridge Energy Partners, L.P. | Subsidiary Issuer and Guarantor - SEP and EEP | Reportable Legal Entities |  |  |  |
Financing activities |  |  |  |
Cash and cash equivalents and restricted cash at beginning of year |  |  | $ 98 |
Cash and cash equivalents and restricted cash at end of year |  |  |  | $ 98

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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