REVENUE RECOGNITION (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Total investment management and service fees
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	$ 1,052	$ 951
Base fees
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	726	645
Performance-based fees
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	6	6
Research services
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	114	113
Distribution services
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	180	165
Shareholder services
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	20	18
Other
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	6	4
Other income
Disaggregation Of Revenue Table [Line Items]
Revenues disaggregated by category	$ 7	$ 7