REVENUES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	$ 12,829	$ 16,924	$ 29,415	$ 32,132
Private Equity
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	$ 7,247	$ 10,738	$ 17,339	$ 19,882

Expiry date 2020-01-01: 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. Effective 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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+ Details