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RELATED PARTY TRANSACTIONS (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CAD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CAD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CAD ($)
RELATED PARTY TRANSACTIONS
Amounts charged to the Company for transportation services		$ 812		$ 572		$ 721
Purchase of natural gas by wholly owned subsidiaries		392		322		142
Sale of natural gas by wholly owned subsidiaries		145		122		60
Total revenue from contracts with customers		$ 19,697		20,797
Minimum
RELATED PARTY TRANSACTIONS
Annual interest rate on the loans (as a percent)	3.00%	3.00%
Maximum
RELATED PARTY TRANSACTIONS
Annual interest rate on the loans (as a percent)	8.00%	8.00%
Vector Pipeline joint venture
RELATED PARTY TRANSACTIONS
Revenue from related parties		$ 7		7		14
Spectra Energy Corp | Reimbursed Maintenance Expenses
RELATED PARTY TRANSACTIONS
Revenue from related parties	$ 36	48	$ 22	28	$ 8	10
Other affiliates
RELATED PARTY TRANSACTIONS
Amounts receivable from affiliates		1,023		769
Natural Gas, Midstream | DCP Midstream, LLC
RELATED PARTY TRANSACTIONS
Total revenue from contracts with customers	26	34	40	52	36	47
Natural Gas, Storage | DCP Midstream, LLC
RELATED PARTY TRANSACTIONS
Total revenue from contracts with customers	$ 52	$ 69	$ 11	$ 14	$ 3	$ 4

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