GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Millions					12 Months Ended
		Sep. 23, 2016	Jun. 21, 2014	Jun. 20, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill And Intangible Asset Impairment [Line Items]
Amortization of other intangibles					$ 31	$ 29	$ 28
AllianceBernstein Acquisitions[Abstract]
Redeemable noncontrolling interest	[1]				626	403
Capitalized Computer Software, Net [Abstract]
Capitalized software, net					162	170
Amortization of capitalized software					47	52	55
Alliance Bernstein
Goodwill And Intangible Asset Impairment [Line Items]
Carrying value of goodwill					3,584	3,584
Gross carrying amount of Alliance Bernstein related intangible assets					623	625
Accumulated amortization of these intangible assets					498	468
Amortization of other intangibles					31	29	$ 28
Amortization expense, 2018					30
Amortization expense, 2019					30
Amortization expense, 2020					23
Amortization expense, 2021					7
Amortization expense, 2022					7
Investment Management segments Other assets [Abstract]
Net deferred sales commissions					30	64
Estimated amortization expense of deferred sales commissions for year 1					21
Estimated amortization expense of deferred sales commissions for year 2					6
Estimated amortization expense of deferred sales commissions for year 3					3
Estimated amortization expense of deferred sales commissions for year 4					0
Estimated amortization expense of deferred sales commissions for year 5					0
AllianceBernstein Acquisitions[Abstract]
Carrying value of goodwill					$ 3,584	$ 3,584
Alliance Bernstein | Ramius Alternative Solutions LLC
Goodwill And Intangible Asset Impairment [Line Items]
Carrying value of goodwill		$ 22
AllianceBernstein Acquisitions[Abstract]
Ownership percentage acquired		100.00%
Recognized identifiable assets acquired and liabilities assumed, assets under management		$ 2,500
Cash payment		21
Contingent consideration payable		$ 12
Consideration payable, measurement period		5 years
Carrying value of goodwill		$ 22
Finite-lived intangible assets acquired		$ 10
Alliance Bernstein | CPH Capital
Goodwill And Intangible Asset Impairment [Line Items]
Carrying value of goodwill				$ 58
AllianceBernstein Acquisitions[Abstract]
Ownership percentage acquired				82.00%		90.00%
Cash payment			$ 64
Contingent consideration payable			$ 9
Consideration payable, measurement period			3 years
Carrying value of goodwill				$ 58
Finite-lived intangible assets acquired				24
Assets under management, carrying amount				3,000
Indefinite-lived intangible assets acquired			$ 4
Redeemable noncontrolling interest				$ 17

[1] See Note 2 for details of balances with variable interest entities.