FINANCIAL INSTRUMENTS - Fair Value of Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Gross Notional	$ 92,529	$ 98,018
All other assets
Gross derivatives	3,162	2,572
Netting and credit adjustments	(740)	(546)
Cash collateral adjustments	(1,934)	(1,286)
Net derivatives recognized in statement of financial position	488	740
Net accrued interest	74	182
Securities held as collateral	(2)	(469)
Net amount	560	452
All other liabilities
Gross derivatives	1,265	853
Netting and credit adjustments	(745)	(546)
Cash collateral adjustments	(133)	(105)
Net derivatives recognized in statement of financial position	387	202
Net accrued interest	1	1
Securities held as collateral	0	0
Net amount	388	203
Derivatives accounted for as hedges
Derivative [Line Items]
Gross Notional	27,942	30,961
All other assets
Gross derivatives	2,091	1,734
All other liabilities
Gross derivatives	121	57
Derivatives accounted for as hedges \| Interest rate contracts
Derivative [Line Items]
Gross Notional	20,974	23,918
All other assets
Gross derivatives	2,019	1,636
All other liabilities
Gross derivatives	8	11
Derivatives accounted for as hedges \| Currency exchange contracts
Derivative [Line Items]
Gross Notional	6,968	7,044
All other assets
Gross derivatives	73	99
All other liabilities
Gross derivatives	113	46
Derivatives not accounted for as hedges
Derivative [Line Items]
Gross Notional	64,586	67,056
All other assets
Gross derivatives	1,070	838
All other liabilities
Gross derivatives	1,144	796
Derivatives not accounted for as hedges \| Interest rate contracts
Derivative [Line Items]
Gross Notional	446	3,185
All other assets
Gross derivatives	6	18
All other liabilities
Gross derivatives	7	12
Derivatives not accounted for as hedges \| Currency exchange contracts
Derivative [Line Items]
Gross Notional	62,340	62,165
All other assets
Gross derivatives	877	697
All other liabilities
Gross derivatives	1,107	744
Derivatives not accounted for as hedges \| Other contracts
Derivative [Line Items]
Gross Notional	1,801	1,706
All other assets
Gross derivatives	187	123
All other liabilities
Gross derivatives	$ 30	$ 40

Derivative Asset, Fair Value, Asset, Accrued Interest, Net

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