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Impairments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) Terminals	Sep. 01, 2016
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Impairment of long-lived assets and equity investments	$ 437.0	$ 172.0	$ 1,013.0
(Gain) Loss on Sale of Assets and Asset Impairment Charges	167.0	13.0	387.0
Loss (Gain) on impairments and divestitures of equity investments, net	270.0	150.0	610.0
Gain (Loss) on Disposition of Assets		0.0	0.0
Revenues	14,144.0	13,705.0	13,058.0
Trans Mountain,Trans Mountain Expansion Project and Other Related Assets [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Gain (Loss) on Disposition of Assets	(595.0)
Sale Equity Interest in SNG [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges			84.0
Disposal Group, Equity Interest Sold				50.00%
Natural Gas Pipelines
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss on impairment of long-lived assets	600.0	30.0	106.0
(Gain) Loss on Sale of Assets and Asset Impairment Charges	(6.0)	0.0	94.0
Loss (Gain) on impairments and divestitures of equity investments, net	270.0	150.0	606.0
Revenues	9,015.0
Natural Gas Pipelines | Investee [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Impairment at equity investee, other than temporary	0.0	10.0	7.0
Natural Gas Pipelines | Sale Equity Interest in SNG [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Disposal Group, Equity Interest Sold				50.00%
Products Pipelines
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss on impairment of long-lived assets	36.0	0.0	66.0
(Gain) Loss on Sale of Assets and Asset Impairment Charges	0.0	0.0	10.0
Loss (Gain) on impairments and divestitures of equity investments, net	0.0	0.0	(12.0)
Revenues	1,713.0
Terminals
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss on impairment of long-lived assets	59.0	3.0	19.0
(Gain) Loss on Sale of Assets and Asset Impairment Charges	(6.0)	(18.0)	80.0
Loss (Gain) on impairments and divestitures of equity investments, net	0.0	0.0	$ 16.0
Number of terminals | Terminals			20
Revenues	2,019.0
Terminals | Deeprock Development [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges		$ (23.0)
Disposal Group, Equity Interest Sold		40.00%
CO2
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss on impairment of long-lived assets	79.0	$ (1.0)	$ 20.0
(Gain) Loss on Sale of Assets and Asset Impairment Charges	0.0	0.0	(1.0)
Revenues	1,255.0
CO2 | Investee [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Impairment at equity investee, other than temporary	0.0	(4.0)	9.0
Other
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges	0.0	2.0	(7.0)
Operating Segments
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges	437.0	172.0	1,013.0
Operating Segments | Products Pipelines
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Revenues	1,699.0	1,645.0	1,631.0
Cost of Sales [Member] | Natural Gas Pipelines | Colden storage [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss on impairment of long-lived assets		3.0
MEP
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Equity Method Investments	235.0	253.0
MEP | Natural Gas Pipelines
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss (Gain) on impairments and divestitures of equity investments, net			350.0
Ruby
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Equity Method Investments	750.0	$ 774.0
Ruby | Natural Gas Pipelines
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss (Gain) on impairments and divestitures of equity investments, net			$ 250.0
Pacific Gas and Electric (PG&E) [Member] | Ruby
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Revenues	93.0
Ruby
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Notes receivable from affiliates	$ 55.0

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