REVENUE RECOGNITION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Total investment management and service fees
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	$ 1,070	$ 990	$ 2,122	$ 1,941
Base fees
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	722	672	1,448	1,317
Performance-based fees
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	35	15	41	21
Research services
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	107	109	221	222
Distribution services
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	182	171	362	336
Shareholder services
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	18	19	38	37
Other
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	6	4	12	8
Other income
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	$ 10	$ 9	$ 17	$ 16