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RELATED PARTY TRANSACTIONS (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CAD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CAD ($)	Dec. 31, 2016 CAD ($)
RELATED PARTY TRANSACTIONS
Amounts charged to the Company for transportation services		$ 572		$ 721	$ 644
Purchase of natural gas by wholly owned subsidiaries		322		142	98
Sale of natural gas by wholly owned subsidiaries		122		60	49
Revenue from contract with customer		$ 21,150
Minimum
RELATED PARTY TRANSACTIONS
Annual interest rate on the loans (as a percent)	4.00%	4.00%
Maximum
RELATED PARTY TRANSACTIONS
Annual interest rate on the loans (as a percent)	8.00%	8.00%
Cost Recoveries
RELATED PARTY TRANSACTIONS
Revenue from related parties	$ 80	$ 104	$ 68	88
Vector Pipeline joint venture
RELATED PARTY TRANSACTIONS
Revenue from related parties		7		14	$ 7
Spectra Energy Corp \| Reimbursed Maintenance Expenses
RELATED PARTY TRANSACTIONS
Revenue from related parties	22	28	8	10
Other affiliates
RELATED PARTY TRANSACTIONS
Amounts receivable from affiliates		769		275
Natural Gas, Midstream \| DCP Midstream, LLC
RELATED PARTY TRANSACTIONS
Revenue from contract with customer	40	52	36	47
Natural Gas, Storage \| DCP Midstream, LLC
RELATED PARTY TRANSACTIONS
Revenue from contract with customer	$ 11	$ 14	$ 3	$ 4