SEGMENTED INFORMATION - Revenue Allocation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure of products and services [line items]
Revenue	$ 56,771	$ 40,786
United States
Disclosure of products and services [line items]
Revenue	9,756	8,284
United Kingdom
Disclosure of products and services [line items]
Revenue	6,422	5,883
United Kingdom
Disclosure of products and services [line items]
Revenue	23,684	15,106
Other Europe
Disclosure of products and services [line items]
Revenue	3,275	617
Australia
Disclosure of products and services [line items]
Revenue	4,968	4,405
Other Asia
Disclosure of products and services [line items]
Revenue	1,643	1,119
Brazil
Disclosure of products and services [line items]
Revenue	4,048	3,206
Colombia
Disclosure of products and services [line items]
Revenue	1,594	970
Other
Disclosure of products and services [line items]
Revenue	$ 1,381	$ 1,196

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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