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	Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Notional Amount	$ 57,454	$ 61,695
Derivative asset, fair value, gross asset including not subject to master netting arrangement	439	482
Derivative liability, fair value, gross liability including not subject to master netting arrangement	625	586
Asset derivatives fair value	342	313
Liability derivatives fair value	385	460
Cash flow hedges
Derivatives, Fair Value [Line Items]
Notional Amount	18	75
Asset derivatives fair value	0	0
Liability derivatives fair value	1	8
Cash flow hedges \| Foreign currency swaps \| Variable Interest Entity
Derivatives, Fair Value [Line Items]
Notional Amount	18	75
Asset derivatives fair value	0	0
Liability derivatives fair value	1	8
Fair value hedges
Derivatives, Fair Value [Line Items]
Notional Amount	8,933	12,780
Asset derivatives fair value	1	0
Liability derivatives fair value	1	43
Fair value hedges \| Foreign currency forwards
Derivatives, Fair Value [Line Items]
Notional Amount	64	964
Asset derivatives fair value	1	0
Liability derivatives fair value	0	38
Fair value hedges \| Foreign currency options
Derivatives, Fair Value [Line Items]
Notional Amount	8,869	11,573
Asset derivatives fair value	0	0
Liability derivatives fair value	1	5
Fair value hedges \| Interest rate swaptions
Derivatives, Fair Value [Line Items]
Notional Amount	0	243
Asset derivatives fair value	0	0
Liability derivatives fair value	0	0
Net investment hedge
Derivatives, Fair Value [Line Items]
Notional Amount	7,120	6,952
Asset derivatives fair value	46	72
Liability derivatives fair value	26	2
Net investment hedge \| Foreign currency forwards
Derivatives, Fair Value [Line Items]
Notional Amount	5,037	4,952
Asset derivatives fair value	45	72
Liability derivatives fair value	26	2
Net investment hedge \| Foreign currency options
Derivatives, Fair Value [Line Items]
Notional Amount	2,083	2,000
Asset derivatives fair value	1	0
Liability derivatives fair value	0	0
Non-qualifying strategies
Derivatives, Fair Value [Line Items]
Notional Amount	41,383	41,888
Asset derivatives fair value	392	410
Liability derivatives fair value	597	533
Non-qualifying strategies \| Foreign currency swaps \| Variable Interest Entity
Derivatives, Fair Value [Line Items]
Notional Amount	2,743	2,587
Asset derivatives fair value	97	169
Liability derivatives fair value	239	118
Non-qualifying strategies \| Foreign currency swaps \| Consolidated Entity Excluding Variable Interest Entities (VIE)
Derivatives, Fair Value [Line Items]
Notional Amount	2,250	2,800
Asset derivatives fair value	53	72
Liability derivatives fair value	49	78
Non-qualifying strategies \| Foreign currency forwards
Derivatives, Fair Value [Line Items]
Notional Amount	25,319	19,821
Asset derivatives fair value	236	166
Liability derivatives fair value	309	337
Non-qualifying strategies \| Foreign currency options
Derivatives, Fair Value [Line Items]
Notional Amount	9,071	9,553
Asset derivatives fair value	0	0
Liability derivatives fair value	0	0
Non-qualifying strategies \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Notional Amount	2,000	7,120
Asset derivatives fair value	6	3
Liability derivatives fair value	0	0
Non-qualifying strategies \| Interest rate swaptions
Derivatives, Fair Value [Line Items]
Notional Amount	0	7
Asset derivatives fair value	0	0
Liability derivatives fair value	$ 0	$ 0

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