REVENUE RECOGNITION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Total investment management and service fees
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	$ 1,092	$ 1,013	$ 3,214	$ 2,954
Base fees
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	740	701	2,188	2,018
Performance-based fees
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	42	4	83	25
Research services
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	103	109	324	331
Distribution services
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	183	175	545	511
Shareholder services
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	20	19	58	56
Other
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	4	5	16	13
Other income
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	$ 7	$ 9	$ 24	$ 25