ACQUISITION OF BUSINESSES - Infrastructure Services, Westinghouse Electric Company (Westinghouse) (Details) - USD ($)		12 Months Ended
	Aug. 01, 2018	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about business combination [line items]
Goodwill		$ 5,218,000,000	$ 2,411,000,000
Infrastructure services
Disclosure of detailed information about business combination [line items]
Goodwill		$ 470,000,000	760,000,000
Infrastructure services | Westinghouse Electric Company
Disclosure of detailed information about business combination [line items]
Proportion of ownership interest in subsidiary	44.00%
Consideration transferred, acquisition-date fair value	$ 1,686,000,000
Acquisition-related costs	55,000,000
Goodwill	174,000,000
Goodwill expected to be deductible for tax purposes	0
Intangible assets	$ 2,544,000,000
Revenue of acquiree since acquisition date			743,000,000
Profit (loss) of acquiree since acquisition date			(37,000,000)
Revenue of acquiree as if combination occurred at beginning of period			1,715,000,000
Profit (loss) of acquiree as if combination occurred at beginning of period			$ 105,000,000
Infrastructure services | Brookfield Business Partners L.P. and Institutional Investors | Westinghouse Electric Company
Disclosure of detailed information about business combination [line items]
Percentage of voting equity interests acquired	100.00%
Infrastructure services | Westinghouse Electric Company
Disclosure of detailed information about business combination [line items]
Percentage of voting equity interests acquired		100.00%
Proportion of ownership interest in subsidiary		44.00%	44.00%
Proportion of voting rights held in subsidiary		100.00%	100.00%