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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Notes under Guarantees (Details) $ in Billions, $ in Billions | Sep. 30, 2019 CAD ($) | Sep. 30, 2019 USD ($)
--- | --- | ---
5.200% Notes due 2020 | Enbridge Energy Partners, L.P. |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 5.20% | 5.20%
4.375% Notes due 2020 | Enbridge Energy Partners, L.P. |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.375% | 4.375%
4.200% Notes due 2021 | Enbridge Energy Partners, L.P. |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.20% | 4.20%
5.875% Notes due 2025 | Enbridge Energy Partners, L.P. |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 5.875% | 5.875%
5.950% Notes due 2033 | Enbridge Energy Partners, L.P. |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 5.95% | 5.95%
6.300% Notes due 2034 | Enbridge Energy Partners, L.P. |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 6.30% | 6.30%
7.500% Notes due 2038 | Enbridge Energy Partners, L.P. |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 7.50% | 7.50%
5.500% Notes due 2040 | Enbridge Energy Partners, L.P. |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 5.50% | 5.50%
7.375% Notes due 2045 | Enbridge Energy Partners, L.P. |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 7.375% | 7.375%
Senior Notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 6.6 | $ 5.9
Senior Notes | Spectra Energy Partners L P |  |
Debt Instrument [Line Items] |  |
Long-term debt |  | 3.9
Senior Notes | Enbridge Energy Partners, L.P. |  |
Debt Instrument [Line Items] |  |
Long-term debt |  | $ 4.0
Senior Notes | 4.600% Senior Notes due 2021 | Spectra Energy Partners L P |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.60% | 4.60%
Senior Notes | 4.750% Senior Notes due 2024 | Spectra Energy Partners L P |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.75% | 4.75%
Senior Notes | 3.500% Senior Notes due 2025 | Spectra Energy Partners L P |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 3.50% | 3.50%
Senior Notes | 3.375% Senior Notes due 2026 | Spectra Energy Partners L P |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 3.375% | 3.375%
Senior Notes | 5.950% Senior Notes due 2043 | Spectra Energy Partners L P |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 5.95% | 5.95%
Senior Notes | 4.500% Senior Notes due 2045 | Spectra Energy Partners L P |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.50% | 4.50%
Senior Notes | 2.900% Senior Notes due 2022 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 2.90% | 2.90%
Senior Notes | 4.000% Senior Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.00% | 4.00%
Senior Notes | 3.500% Senior Notes due 2024 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 3.50% | 3.50%
Senior Notes | 4.250% Senior Notes due 2026 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.25% | 4.25%
Senior Notes | 3.700% Senior Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 3.70% | 3.70%
Senior Notes | 4.500% Senior Notes due 2044 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.50% | 4.50%
Senior Notes | 5.500% Senior Notes due 2046 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 5.50% | 5.50%
Senior Notes | 4.850% Senior Notes due 2020 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.53% | 4.53%
Senior Notes | 4.260% Senior Notes due 2021 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.85% | 4.85%
Senior Notes | 3.160% Senior Notes due 2021 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.26% | 4.26%
Senior Notes | 4.850% Senior Notes due 2022 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 3.16% | 3.16%
Senior Notes | 3.190% Senior Notes due 2022 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.85% | 4.85%
Senior Notes | 3.940% Senior Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 3.19% | 3.19%
Senior Notes | 3.940% Senior Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 3.94% | 3.94%
Senior Notes | 3.950% Senior Notes due 2024 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 3.94% | 3.94%
Senior Notes | 3.200% Senior Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 3.95% | 3.95%
Senior Notes | 6.100% Senior Notes due 2028 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 3.20% | 3.20%
Senior Notes | 7.220% Senior Notes due 2030 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 6.10% | 6.10%
Senior Notes | 7.200% Senior Notes due 2032 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 7.22% | 7.22%
Senior Notes | 5.570% Senior Notes due 2035 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 7.20% | 7.20%
Senior Notes | 5.750% Senior Notes due 2039 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 5.57% | 5.57%
Senior Notes | 5.120% Senior Notes due 2040 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 5.75% | 5.75%
Senior Notes | 4.240% Senior Notes due 2042 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 5.12% | 5.12%
Senior Notes | 4.570% Senior Notes due 2044 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.24% | 4.24%
Senior Notes | 4.870% Senior Notes due 2044 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.57% | 4.57%
Senior Notes | 4.560% Senior Notes due 2064 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.87% | 4.87%
Senior Notes | 4.560% Senior Notes due 2064 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 4.56% | 4.56%

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