INVESTMENTS - Equity Method Investments - Statement of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity in income (loss) from AB	$ 3	$ 8	$ 7
Alliance Bernstein
Schedule of Equity Method Investments [Line Items]
Equity in income (loss) from AB	3	8	7
Alliance Bernstein
Schedule of Equity Method Investments [Line Items]
Total Revenues	4,442	3,709	3,518
Total Expenses	3,225	2,801	2,695
Net income (loss)	$ 1,154	$ 862	$ 782