LOANS - Corporate Loans Credit Quality Indicators (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Loans receivable
Total	$ 657,221	$ 667,767
Loans held at fair value	5,360	6,082
Lease financing
Loans receivable
Total	400	500
Corporate
Loans receivable
Total	289,154	291,233
Total non-accrual	1,122	1,553
Loans held at fair value	5,123	6,070
Corporate | Commercial and industrial
Loans receivable
Total	147,803	147,004
Total non-accrual	860	1,263
Corporate | Financial institutions
Loans receivable
Total	64,907	71,767
Total non-accrual	152	2
Corporate | Mortgage and real estate
Loans receivable
Total	21,949	20,291
Total non-accrual	33	136
Corporate | Lease financing
Loans receivable
Total	354	455
Total non-accrual	10	14
Corporate | Other
Loans receivable
Total	49,018	45,646
Total non-accrual	67	138
Corporate | Corporate loans, net of unearned income
Loans receivable
Current fiscal year	113,347	90,549
One year prior to current fiscal year	19,129	17,944
Two years prior to current fiscal year	9,785	15,094
Three years prior to current fiscal year	5,883	13,278
Four years prior to current fiscal year	4,000	7,071
Prior	7,848	21,190
Revolving line of credit arrangements	124,039	120,037
Total	289,154	291,233
Loans held at fair value	5,123	6,070
Corporate | Investment Grade
Loans receivable
Current fiscal year	83,211	66,744
One year prior to current fiscal year	13,937	13,966
Two years prior to current fiscal year	7,140	10,317
Three years prior to current fiscal year	4,294	9,599
Four years prior to current fiscal year	2,678	4,872
Prior	6,760	15,635
Revolving line of credit arrangements	102,781	93,086
Total	220,801	214,219
Corporate | Investment Grade | Commercial and industrial
Loans receivable
Current fiscal year	50,086	42,422
One year prior to current fiscal year	5,716	5,529
Two years prior to current fiscal year	2,454	4,642
Three years prior to current fiscal year	2,348	3,757
Four years prior to current fiscal year	1,129	2,911
Prior	1,776	8,392
Revolving line of credit arrangements	38,359	30,588
Total	101,868	98,241
Corporate | Investment Grade | Financial institutions
Loans receivable
Current fiscal year	13,547	12,862
One year prior to current fiscal year	3,174	1,678
Two years prior to current fiscal year	813	1,183
Three years prior to current fiscal year	593	1,038
Four years prior to current fiscal year	284	419
Prior	713	1,354
Revolving line of credit arrangements	37,463	43,630
Total	56,587	62,164
Corporate | Investment Grade | Mortgage and real estate
Loans receivable
Current fiscal year	7,321	2,423
One year prior to current fiscal year	3,876	3,660
Two years prior to current fiscal year	3,379	3,332
Three years prior to current fiscal year	1,205	2,015
Four years prior to current fiscal year	577	1,212
Prior	775	1,288
Revolving line of credit arrangements	152	141
Total	17,285	14,071
Corporate | Investment Grade | Other
Loans receivable
Current fiscal year	12,257	9,037
One year prior to current fiscal year	1,171	3,099
Two years prior to current fiscal year	494	1,160
Three years prior to current fiscal year	148	2,789
Four years prior to current fiscal year	688	330
Prior	3,496	4,601
Revolving line of credit arrangements	26,807	18,727
Total	45,061	39,743
Corporate | Non-investment grade, accrual | Commercial and industrial
Loans receivable
Current fiscal year	21,877	16,783
One year prior to current fiscal year	3,114	2,281
Two years prior to current fiscal year	1,371	2,343
Three years prior to current fiscal year	800	2,024
Four years prior to current fiscal year	661	1,412
Prior	402	3,981
Revolving line of credit arrangements	16,850	18,676
Total	45,075	47,500
Corporate | Non-investment grade, accrual | Financial institutions
Loans receivable
Current fiscal year	5,110	4,325
One year prior to current fiscal year	626	347
Two years prior to current fiscal year	247	567
Three years prior to current fiscal year	65	101
Four years prior to current fiscal year	36	71
Prior	11	511
Revolving line of credit arrangements	2,073	3,679
Total	8,168	9,601
Corporate | Non-investment grade, accrual | Mortgage and real estate
Loans receivable
Current fiscal year	1,081	1,275
One year prior to current fiscal year	989	869
Two years prior to current fiscal year	470	1,228
Three years prior to current fiscal year	556	1,018
Four years prior to current fiscal year	562	493
Prior	501	586
Revolving line of credit arrangements	472	615
Total	4,631	6,084
Corporate | Non-investment grade, accrual | Other
Loans receivable
Current fiscal year	1,938	1,339
One year prior to current fiscal year	360	349
Two years prior to current fiscal year	466	554
Three years prior to current fiscal year	107	364
Four years prior to current fiscal year	7	119
Prior	64	245
Revolving line of credit arrangements	1,292	3,236
Total	4,234	6,206
Corporate | Non-investment grade, non-accrual | Commercial and industrial
Loans receivable
Current fiscal year	80	53
One year prior to current fiscal year	31	119
Two years prior to current fiscal year	90	64
Three years prior to current fiscal year	53	104
Four years prior to current fiscal year	44	94
Prior	83	117
Revolving line of credit arrangements	479	712
Total non-accrual	860	1,263
Corporate | Non-investment grade, non-accrual | Financial institutions
Loans receivable
Current fiscal year	41	0
One year prior to current fiscal year	35	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving line of credit arrangements	76	2
Total non-accrual	152	2
Corporate | Non-investment grade, non-accrual | Mortgage and real estate
Loans receivable
Current fiscal year	2	11
One year prior to current fiscal year	11	8
Two years prior to current fiscal year	0	2
Three years prior to current fiscal year	0	49
Four years prior to current fiscal year	2	10
Prior	18	25
Revolving line of credit arrangements	0	31
Total non-accrual	33	136
Corporate | Non-investment grade, non-accrual | Other
Loans receivable
Current fiscal year	7	19
One year prior to current fiscal year	26	5
Two years prior to current fiscal year	1	19
Three years prior to current fiscal year	8	19
Four years prior to current fiscal year	10	0
Prior	9	90
Revolving line of credit arrangements	16	0
Total non-accrual	77	152
Corporate | Non-Investment Grade
Loans receivable
Current fiscal year	30,136	23,805
One year prior to current fiscal year	5,192	3,978
Two years prior to current fiscal year	2,645	4,777
Three years prior to current fiscal year	1,589	3,679
Four years prior to current fiscal year	1,322	2,199
Prior	1,088	5,555
Revolving line of credit arrangements	21,258	26,951
Total	$ 63,230	$ 70,944