RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [line items]
Directors' fees (less than)	$ 1	$ 1	$ 1
Asset management fee as percent per quarter	0.3125%
Asset management fee, percent	1.25%
Service Provider
Disclosure of transactions between related parties [line items]
Asset management fee as percent per quarter	0.3125%
Asset management fee, percent	1.25%
Services received, related party transactions	$ 214	230	158
Amounts payable, related party transactions	51	64
Subsidiary of Common Parent (Brookfield)
Disclosure of transactions between related parties [line items]
Services received, related party transactions	1	1	1
Amounts payable, related party transactions	73	75
Amounts receivable, related party transactions	$ 20	20
Subsidiary of Common Parent (Brookfield) \| Bottom of range
Disclosure of transactions between related parties [line items]
Amounts payable, related party transactions, interest rate	8.50%
Subsidiary of Common Parent (Brookfield) \| Top of range
Disclosure of transactions between related parties [line items]
Amounts payable, related party transactions, interest rate	3.80%
Subsidiary of Common Parent (Brookfield) \| Brookfield Office Properties Inc.
Disclosure of transactions between related parties [line items]
Services received, related party transactions	$ 5	4	1
Revenue from rendering of services, related party transactions	16	8	1
Subsidiary of Common Parent (Brookfield) \| Brookfield Renewable Partners L.P.
Disclosure of transactions between related parties [line items]
Services received, related party transactions	11	0
Revenue from sale of goods, related party transactions	1	0
Brookfield
Disclosure of transactions between related parties [line items]
Deposit balance	1	1
Earned interest on deposits	1	1	$ 1
Credit facility, maximum borrowing capacity	500
Non-recourse borrowings	0	0
U.K. port operation \| Subsidiary of Common Parent (Brookfield) \| Brookfield Business Partners LP
Disclosure of transactions between related parties [line items]
Revenue from sale of goods, related party transactions	4	2
Australian port operation \| Subsidiary of Common Parent (Brookfield) \| Brookfield Business Partners LP
Disclosure of transactions between related parties [line items]
Revenue from sale of goods, related party transactions	$ 1	$ 0

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