FINANCIAL INSTRUMENTS - Fair Value of Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Gross Notional	$ 89,801	$ 98,018
All other assets
Gross derivatives	2,985	2,572
Netting and credit adjustments	(704)	(546)
Cash collateral adjustments	(1,212)	(1,286)
Net derivatives recognized in statement of financial position	1,069	740
Net accrued interest	118	182
Securities held as collateral	(720)	(469)
Net amount	467	452
All other liabilities
Gross derivatives	1,257	853
Netting and credit adjustments	(710)	(546)
Cash collateral adjustments	(149)	(105)
Net derivatives recognized in statement of financial position	398	202
Net accrued interest	15	1
Securities held as collateral	0	0
Net amount	413	203
Derivatives accounted for as hedges
Derivative [Line Items]
Gross Notional	27,247	30,961
All other assets
Gross derivatives	2,139	1,734
All other liabilities
Gross derivatives	203	57
Derivatives accounted for as hedges \| Interest rate contracts
Derivative [Line Items]
Gross Notional	20,790	23,918
All other assets
Gross derivatives	2,081	1,636
All other liabilities
Gross derivatives	9	11
Derivatives accounted for as hedges \| Currency exchange contracts
Derivative [Line Items]
Gross Notional	6,457	7,044
All other assets
Gross derivatives	58	99
All other liabilities
Gross derivatives	194	46
Derivatives not accounted for as hedges
Derivative [Line Items]
Gross Notional	62,554	67,056
All other assets
Gross derivatives	846	838
All other liabilities
Gross derivatives	1,055	796
Derivatives not accounted for as hedges \| Interest rate contracts
Derivative [Line Items]
Gross Notional	717	3,185
All other assets
Gross derivatives	9	18
All other liabilities
Gross derivatives	7	12
Derivatives not accounted for as hedges \| Currency exchange contracts
Derivative [Line Items]
Gross Notional	60,356	62,165
All other assets
Gross derivatives	750	697
All other liabilities
Gross derivatives	1,018	744
Derivatives not accounted for as hedges \| Other contracts
Derivative [Line Items]
Gross Notional	1,482	1,706
All other assets
Gross derivatives	87	123
All other liabilities
Gross derivatives	$ 30	$ 40

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

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