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, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Notional Amount	$ 58,656	$ 61,695
Derivative asset, fair value, gross asset including not subject to master netting arrangement	583	482
Derivative liability, fair value, gross liability including not subject to master netting arrangement	697	586
Asset derivatives fair value	450	313
Liability derivatives fair value	466	460
Foreign currency options
Derivatives, Fair Value [Line Items]
Notional Amount	5,000
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	8,929	12,780
Asset derivatives fair value	2	0
Liability derivatives fair value	0	43
Fair value hedges \| Foreign currency forwards
Derivatives, Fair Value [Line Items]
Notional Amount	64	964
Asset derivatives fair value	2	0
Liability derivatives fair value	0	38
Fair value hedges \| Foreign currency options
Derivatives, Fair Value [Line Items]
Notional Amount	8,865	11,573
Asset derivatives fair value	0	0
Liability derivatives fair value	0	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	7,037	6,952
Asset derivatives fair value	15	72
Liability derivatives fair value	84	2
Net investment hedge \| Foreign currency forwards
Derivatives, Fair Value [Line Items]
Notional Amount	5,010	4,952
Asset derivatives fair value	14	72
Liability derivatives fair value	84	2
Net investment hedge \| Foreign currency options
Derivatives, Fair Value [Line Items]
Notional Amount	2,027	2,000
Asset derivatives fair value	1	0
Liability derivatives fair value	0	0
Non-qualifying strategies
Derivatives, Fair Value [Line Items]
Notional Amount	42,672	41,888
Asset derivatives fair value	566	410
Liability derivatives fair value	612	533
Non-qualifying strategies \| Foreign currency swaps \| Variable Interest Entity
Derivatives, Fair Value [Line Items]
Notional Amount	2,857	2,587
Asset derivatives fair value	133	169
Liability derivatives fair value	230	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	47	72
Liability derivatives fair value	81	78
Non-qualifying strategies \| Foreign currency forwards
Derivatives, Fair Value [Line Items]
Notional Amount	26,528	19,821
Asset derivatives fair value	386	166
Liability derivatives fair value	301	337
Non-qualifying strategies \| Foreign currency options
Derivatives, Fair Value [Line Items]
Notional Amount	11,037	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	0	7,120
Asset derivatives fair value	0	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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