FINANCIAL INSTRUMENTS - Fair Value of Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Gross Notional	$ 101,209	$ 98,018
All other assets
Gross derivatives	3,500	2,572
Netting and credit adjustments	(1,145)	(546)
Cash collateral adjustments	(1,297)	(1,286)
Net derivatives recognized in statement of financial position	1,058	740
Net accrued interest	71	182
Securities held as collateral	(693)	(469)
Net amount	436	452
All other liabilities
Gross derivatives	1,874	853
Netting and credit adjustments	(1,155)	(546)
Cash collateral adjustments	(198)	(105)
Net derivatives recognized in statement of financial position	520	202
Net accrued interest	1	1
Securities held as collateral	0	0
Net amount	521	203
Derivatives accounted for as hedges
Derivative [Line Items]
Gross Notional	30,924	30,961
All other assets
Gross derivatives	2,361	1,734
All other liabilities
Gross derivatives	287	57
Derivatives accounted for as hedges \| Interest rate contracts
Derivative [Line Items]
Gross Notional	23,617	23,918
All other assets
Gross derivatives	2,191	1,636
All other liabilities
Gross derivatives	9	11
Derivatives accounted for as hedges \| Currency exchange contracts
Derivative [Line Items]
Gross Notional	7,307	7,044
All other assets
Gross derivatives	170	99
All other liabilities
Gross derivatives	277	46
Derivatives not accounted for as hedges
Derivative [Line Items]
Gross Notional	70,285	67,056
All other assets
Gross derivatives	1,139	838
All other liabilities
Gross derivatives	1,587	796
Derivatives not accounted for as hedges \| Interest rate contracts
Derivative [Line Items]
Gross Notional	2,447	3,185
All other assets
Gross derivatives	29	18
All other liabilities
Gross derivatives	7	12
Derivatives not accounted for as hedges \| Currency exchange contracts
Derivative [Line Items]
Gross Notional	66,240	62,165
All other assets
Gross derivatives	1,105	697
All other liabilities
Gross derivatives	1,477	744
Derivatives not accounted for as hedges \| Other contracts
Derivative [Line Items]
Gross Notional	1,598	1,706
All other assets
Gross derivatives	5	123
All other liabilities
Gross derivatives	$ 103	$ 40

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

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