CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Schedule of Long Term Debt Instruments (Details) $ in Millions, $ in Billions	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CAD ($)
Condensed Financial Statements, Captions [Line Items]
Long-term debt		$ 63,585
Senior notes
Condensed Financial Statements, Captions [Line Items]
Long-term debt	$ 7.9	$ 7,600
2.900% Senior Notes due 2022 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	290.00%	290.00%
4.000% Senior Notes due 2023 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	400.00%	400.00%
2.500% Senior Notes due 2025 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	350.00%	350.00%
2.500% Senior Notes due 2025 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	250.00%	250.00%
4.250% Senior Notes due 2026 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	425.00%	425.00%
3.700% Senior Notes due 2027 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	370.00%	370.00%
3.125% Senior Notes due 2029 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	312.50%	312.50%
4.500% Senior Notes due 2044 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	450.00%	450.00%
5.500% Senior Notes due 2046 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	550.00%	550.00%
4.000% Senior Notes due 2049 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	400.00%	400.00%
4.530% Senior Notes due 2020 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	453.00%	453.00%
4.850% Senior Notes due 2020 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	485.00%	485.00%
4.260% Senior Notes due 2021 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	426.00%	426.00%
3.160% Senior Notes due 2021 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	316.00%	316.00%
4.850% Senior Notes due 2022 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	485.00%	485.00%
3.190% Senior Notes due 2022 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	319.00%	319.00%
3.940% Senior Notes due 2023 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	394.00%	394.00%
3.940% Senior Notes due 2023 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	394.00%	394.00%
3.950% Senior Notes due 2024 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	395.00%	395.00%
3.200% Senior Notes due 2027 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	320.00%	320.00%
6.100% Senior Notes due 2028 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	610.00%	610.00%
2.990% Senior Notes due 2029 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	299.00%	299.00%
7.220% Senior Notes due 2030 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	722.00%	722.00%
7.200% Senior Notes due 2032 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	720.00%	720.00%
5.570% Senior Notes due 2035 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	557.00%	557.00%
5.120% Senior Notes due 2040 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	575.00%	575.00%
5.120% Senior Notes due 2040 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	512.00%	512.00%
4.240% Senior Notes due 2042 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	424.00%	424.00%
4.570% Senior Notes due 2044 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	457.00%	457.00%
4.870% Senior Notes due 2044 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	487.00%	487.00%
4.560% Senior Notes due 2064 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	456.00%	456.00%
Spectra Energy Partners, LP | Senior notes
Condensed Financial Statements, Captions [Line Items]
Long-term debt	$ 3.9
Spectra Energy Partners, LP | 4.600% Senior Notes due 2021 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	4.60%	4.60%
Spectra Energy Partners, LP | 4.750% Senior Notes due 2024 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	4.75%	4.75%
Spectra Energy Partners, LP | 3.500% Senior Notes due 2025 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	3.50%	3.50%
Spectra Energy Partners, LP | 3.375% Senior Notes due 2026 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	3.375%	3.375%
Spectra Energy Partners, LP | 5.950% Senior Notes due 2043 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	5.95%	5.95%
Spectra Energy Partners, LP | 4.500% Senior Notes due 2045 | Senior notes
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	4.50%	4.50%
Enbridge Energy Partners, L.P. | Senior notes
Condensed Financial Statements, Captions [Line Items]
Long-term debt	$ 3.0
Enbridge Energy Partners, L.P. | 4.200% Notes due 2021
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	4.20%	4.20%
Enbridge Energy Partners, L.P. | 5.875% Notes due 2025
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	5.875%	5.875%
Enbridge Energy Partners, L.P. | 5.950% Notes due 2033
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	5.95%	5.95%
Enbridge Energy Partners, L.P. | 6.300% Notes due 2034
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	6.30%	6.30%
Enbridge Energy Partners, L.P. | 7.500% Notes due 2038
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	7.50%	7.50%
Enbridge Energy Partners, L.P. | 5.500% Notes due 2040
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	5.50%	5.50%
Enbridge Energy Partners, L.P. | 7.375% Notes due 2045
Condensed Financial Statements, Captions [Line Items]
Interest rate (percent)	7.375%	7.375%