DERIVATIVE INSTRUMENTS - Summary of Balance Sheet Classification of Derivative Fair Value Amounts, as well as Gross Asset and Liability Fair Value Amounts (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	$ 25,751	$ 43,927
Derivative asset, fair value, gross asset including not subject to master netting arrangement	331	1,207
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(474)	(1,998)
Asset Derivatives Fair Value	180	1,080
Liability Derivatives Fair Value	(346)	(1,852)
Other assets
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	10,948	18,329
Asset Derivatives Fair Value	331	1,207
Liability Derivatives Fair Value	0	0
Other Liabilities
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	14,803	25,598
Asset Derivatives Fair Value	0	0
Liability Derivatives Fair Value	(474)	(1,998)
Cash flow hedges
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	75	75
Asset Derivatives Fair Value	0	0
Liability Derivatives Fair Value	(8)	(10)
Cash flow hedges | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	75	75
Asset Derivatives Fair Value	0	0
Liability Derivatives Fair Value	(8)	(10)
Fair value hedges
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	15,310	15,189
Asset Derivatives Fair Value	2	2
Liability Derivatives Fair Value	(223)	(791)
Fair value hedges | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	7,640	10,965
Asset Derivatives Fair Value	2	0
Liability Derivatives Fair Value	(221)	(759)
Fair value hedges | Foreign currency options
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	7,670	4,224
Asset Derivatives Fair Value	0	2
Liability Derivatives Fair Value	(2)	(32)
Net investment hedge
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	439	1,052
Asset Derivatives Fair Value	12	46
Liability Derivatives Fair Value	(1)	(19)
Net investment hedge | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	5	209
Asset Derivatives Fair Value	0	5
Liability Derivatives Fair Value	0	(2)
Net investment hedge | Foreign currency options
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	434	843
Asset Derivatives Fair Value	12	41
Liability Derivatives Fair Value	(1)	(17)
Non-qualifying strategies
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	9,927	27,611
Asset Derivatives Fair Value	317	1,159
Liability Derivatives Fair Value	(242)	(1,178)
Non-qualifying strategies | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	5,386	6,266
Asset Derivatives Fair Value	296	490
Liability Derivatives Fair Value	(189)	(220)
Non-qualifying strategies | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	3,683	21,218
Asset Derivatives Fair Value	20	667
Liability Derivatives Fair Value	(53)	(956)
Non-qualifying strategies | Foreign currency options
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	770	41
Asset Derivatives Fair Value	0	0
Liability Derivatives Fair Value	0	(2)
Non-qualifying strategies | Credit default swaps
Derivatives, Fair Value [Line Items]
Net Derivatives Notional Amount	88	86
Asset Derivatives Fair Value	1	2
Liability Derivatives Fair Value	$ 0	$ 0