FAIR VALUE MEASUREMENT - Items Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under resale agreements	$ 365,401	$ 327,288
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Netting	(112,391)	(131,342)
Trading account assets	334,114	331,945
Less: Netting agreements to assets	(346,545)	(292,628)
Less: Netting of cash collateral received	(23,136)	(24,447)
Trading derivatives	75,306	69,776
Investments	526,582	512,822
Loans	5,360	6,082
Liabilities, Fair Value Disclosure [Abstract]
Securities loaned and sold under agreements to repurchase, netting	(112,391)	(131,342)
Netting agreements	(346,545)	(292,628)
Netting of cash collateral paid	(30,032)	(29,306)
Total derivative liabilities	59,916	55,516
Short-term borrowings	47,096	27,973
Long-term debt	271,606	254,374
Brokerage payable, at fair value	69,218	61,430
Fair value
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under resale agreements	239,527	216,466
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell	125,900	110,800
Loans	634,900	659,600
Non-trading derivatives and other financial assets measured on a recurring basis, net	427,100	351,900
Liabilities, Fair Value Disclosure [Abstract]
Securities loaned and sold under agreements to repurchase	131,600	134,600
Short-term borrowings	6,222	7,358
Long-term debt	160,500	184,600
Long-term debt	105,995	82,609
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross	142,400	111,100
Brokerage payable, at fair value	4,439	3,575
Non-marketable equity securities | Fair value
Assets, Fair Value Disclosure [Abstract]
Investments	466	489
Level 1 | Fair value
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell	0	0
Loans	0	0
Non-trading derivatives and other financial assets measured on a recurring basis, net	320,000	242,100
Liabilities, Fair Value Disclosure [Abstract]
Securities loaned and sold under agreements to repurchase	0	0
Long-term debt	0	0
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross	0	0
Level 2 | Fair value
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell	125,900	106,400
Loans	0	0
Non-trading derivatives and other financial assets measured on a recurring basis, net	22,000	19,900
Liabilities, Fair Value Disclosure [Abstract]
Securities loaned and sold under agreements to repurchase	131,600	134,500
Long-term debt	151,100	171,900
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross	26,500	17,000
Level 3 | Fair value
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell	0	4,400
Loans	634,900	659,600
Non-trading derivatives and other financial assets measured on a recurring basis, net	85,100	89,900
Liabilities, Fair Value Disclosure [Abstract]
Securities loaned and sold under agreements to repurchase	0	100
Long-term debt	9,400	12,700
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross	115,900	94,100
Fair Value Measured at Net Asset Value Per Share
Liabilities, Fair Value Disclosure [Abstract]
Alternative investment funds, fair value	27	145
Recurring
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell	350,294	342,261
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Netting	(110,767)	(125,795)
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell		216,466
Investments	250,547	289,409
Loans	5,360	6,082
Mortgage servicing rights	665	404
Total assets before netting	1,321,319	1,299,518
Total assets, Netting	(480,448)	(442,870)
Total assets	840,871	856,648
Liabilities, Fair Value Disclosure [Abstract]
Interest-bearing deposits	1,875	1,666
Securities loaned and sold under agreements to repurchase, gross	156,853	174,961
Securities loaned and sold under agreements to repurchase, netting	(85,967)	(118,267)
Securities loaned and sold under agreements to repurchase	70,886	56,694
Securities sold, not yet purchased	110,720	106,008
Other trading liabilities	110,731	106,013
Short-term borrowings	6,222	7,358
Long-term debt	105,995	82,609
Total liabilities, gross	822,608	753,632
Total liabilities, netting	(462,544)	(440,201)
Total liabilities	360,064	313,431
Recurring | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	436,493	377,450
Netting agreements	(346,545)	(292,628)
Netting of cash collateral paid	(30,032)	(29,306)
Total trading derivatives—after netting and collateral, gross	436,493	377,450
Netting, Liabilities, total of netting agreements and cash collateral received	(376,577)	(321,934)
Total derivative liabilities	59,916	55,516
Recurring | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	172,620	150,074
Recurring | Trading derivatives liabilities | Foreign exchange contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	185,995	135,298
Recurring | Trading derivatives liabilities | Equity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	43,783	49,684
Recurring | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	26,318	31,379
Recurring | Trading derivatives liabilities | Credit derivatives
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	7,777	11,015
Recurring | Non-trading derivatives and other financial liabilities
Liabilities, Fair Value Disclosure [Abstract]
Netting, Liabilities, total of netting agreements and cash collateral received	0	0
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross	4,439	3,575
Total non-trading derivatives and other financial liabilities measured on recurring basis		3,575
Recurring | Mortgage-backed securities - U.S. government-sponsored agency guaranteed
Assets, Fair Value Disclosure [Abstract]
Trading account assets	35,478	35,030
Investments	11,262	33,216
Recurring | Mortgage-backed securities - Residential
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1,988	748
Investments	485	380
Recurring | Mortgage-backed securities - Commercial
Assets, Fair Value Disclosure [Abstract]
Trading account assets	943	859
Investments	2	25
Recurring | Mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	38,409	36,637
Investments	11,749	33,621
Recurring | U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	67,581	48,134
Investments	92,290	122,440
Recurring | State and municipal
Assets, Fair Value Disclosure [Abstract]
Trading account assets	2,263	2,032
Investments	2,223	2,621
Recurring | Foreign government
Assets, Fair Value Disclosure [Abstract]
Trading account assets	64,352	70,684
Investments	133,277	118,740
Recurring | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	13,942	18,112
Investments	4,916	5,920
Recurring | Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	54,361	64,054
Investments	429	543
Recurring | Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	2,265	1,594
Investments	1,030	303
Recurring | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	15,635	20,922
Investments	4,194	4,877
Recurring | Non-marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Investments	439	344
Recurring | Trading account liabilities
Liabilities, Fair Value Disclosure [Abstract]
Other trading liabilities	11	5
Recurring | Trading securities (excluding trading account derivatives)
Assets, Fair Value Disclosure [Abstract]
Trading account assets	258,808	262,169
Recurring | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	444,987	386,851
Trading derivative, asset, after netting and collateral	444,987	386,851
Less: Netting agreements to assets	(346,545)	(292,628)
Less: Netting of cash collateral received	(23,136)	(24,447)
Netting, assets	(369,681)	(317,075)
Trading derivatives	75,306	69,776
Recurring | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	178,204	165,488
Recurring | Trading account assets | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	187,663	135,549
Recurring | Trading account assets | Equity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	42,407	45,252
Recurring | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	28,324	30,344
Recurring | Trading account assets | Credit derivatives
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	8,389	10,218
Recurring | Non-trading derivatives and other financial assets
Assets, Fair Value Disclosure [Abstract]
Netting, assets	0	0
Total Non-trading derivatives and other financial assets measured on a recurring basis, gross	10,658	12,342
Non-trading derivatives and other financial assets measured on a recurring basis, net		12,342
Recurring | Level 1
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell	0	0
Investments	152,754	182,324
Loans	0	0
Mortgage servicing rights	0	0
Total assets before netting	$ 304,439	$ 325,984
Total as a percentage of gross assets	23.00%	29.00%
Liabilities, Fair Value Disclosure [Abstract]
Interest-bearing deposits	$ 0	$ 0
Securities loaned and sold under agreements to repurchase, gross	0	0
Securities sold, not yet purchased	97,559	82,675
Other trading liabilities	97,559	82,675
Short-term borrowings	0	0
Long-term debt	0	0
Total liabilities, gross	$ 102,003	$ 86,365
Total as a percentage of gross liabilities	12.40%	11.50%
Recurring | Level 1 | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	$ 247	$ 116
Recurring | Level 1 | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	175	56
Recurring | Level 1 | Trading derivatives liabilities | Foreign exchange contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	0	0
Recurring | Level 1 | Trading derivatives liabilities | Equity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	70	60
Recurring | Level 1 | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	2	0
Recurring | Level 1 | Trading derivatives liabilities | Credit derivatives
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	0	0
Recurring | Level 1 | Non-trading derivatives and other financial liabilities
Liabilities, Fair Value Disclosure [Abstract]
Non-trading derivatives and other financial liabilities measured on recurring basis	4,197	3,574
Recurring | Level 1 | Mortgage-backed securities - U.S. government-sponsored agency guaranteed
Assets, Fair Value Disclosure [Abstract]
Trading account assets	0	0
Investments	0	0
Recurring | Level 1 | Mortgage-backed securities - Residential
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1	1
Investments	0	0
Recurring | Level 1 | Mortgage-backed securities - Commercial
Assets, Fair Value Disclosure [Abstract]
Trading account assets	0	0
Investments	0	0
Recurring | Level 1 | Mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1	1
Investments	0	0
Recurring | Level 1 | U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	63,067	44,900
Investments	91,851	122,271
Recurring | Level 1 | State and municipal
Assets, Fair Value Disclosure [Abstract]
Trading account assets	0	0
Investments	0	0
Recurring | Level 1 | Foreign government
Assets, Fair Value Disclosure [Abstract]
Trading account assets	38,383	39,176
Investments	58,419	56,842
Recurring | Level 1 | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1,593	1,544
Investments	2,230	2,861
Recurring | Level 1 | Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	43,990	53,833
Investments	254	350
Recurring | Level 1 | Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	0	0
Investments	0	0
Recurring | Level 1 | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	24	0
Investments	0	0
Recurring | Level 1 | Non-marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Investments	0	0
Recurring | Level 1 | Trading account liabilities
Liabilities, Fair Value Disclosure [Abstract]
Other trading liabilities	0	0
Recurring | Level 1 | Trading securities (excluding trading account derivatives)
Assets, Fair Value Disclosure [Abstract]
Trading account assets	147,058	139,454
Recurring | Level 1 | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	317	131
Recurring | Level 1 | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	297	90
Recurring | Level 1 | Trading account assets | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	0	0
Recurring | Level 1 | Trading account assets | Equity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	20	41
Recurring | Level 1 | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	0	0
Recurring | Level 1 | Trading account assets | Credit derivatives
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	0	0
Recurring | Level 1 | Non-trading derivatives and other financial assets
Assets, Fair Value Disclosure [Abstract]
Non-trading derivatives and other financial assets measured on a recurring basis, gross	4,310	4,075
Recurring | Level 2
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell	350,145	342,030
Investments	95,744	104,858
Loans	3,999	5,371
Mortgage servicing rights	0	0
Total assets before netting	$ 1,001,032	$ 958,810
Total as a percentage of gross assets	75.80%	69.90%
Liabilities, Fair Value Disclosure [Abstract]
Interest-bearing deposits	$ 1,860	$ 1,483
Securities loaned and sold under agreements to repurchase, gross	155,822	174,318
Securities sold, not yet purchased	13,111	23,268
Other trading liabilities	13,119	23,273
Short-term borrowings	6,184	7,253
Long-term debt	69,878	57,100
Total liabilities, gross	$ 674,144	$ 632,091
Total as a percentage of gross liabilities	82.00%	83.90%
Recurring | Level 2 | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	$ 427,041	$ 368,664
Recurring | Level 2 | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	169,049	147,846
Recurring | Level 2 | Trading derivatives liabilities | Foreign exchange contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	185,279	134,572
Recurring | Level 2 | Trading derivatives liabilities | Equity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	40,905	46,177
Recurring | Level 2 | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	25,093	30,004
Recurring | Level 2 | Trading derivatives liabilities | Credit derivatives
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	6,715	10,065
Recurring | Level 2 | Non-trading derivatives and other financial liabilities
Liabilities, Fair Value Disclosure [Abstract]
Non-trading derivatives and other financial liabilities measured on recurring basis	240	0
Recurring | Level 2 | Mortgage-backed securities - U.S. government-sponsored agency guaranteed
Assets, Fair Value Disclosure [Abstract]
Trading account assets	34,878	34,534
Investments	11,232	33,165
Recurring | Level 2 | Mortgage-backed securities - Residential
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1,821	643
Investments	444	286
Recurring | Level 2 | Mortgage-backed securities - Commercial
Assets, Fair Value Disclosure [Abstract]
Trading account assets	798	778
Investments	2	25
Recurring | Level 2 | Mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	37,497	35,955
Investments	11,678	33,476
Recurring | Level 2 | U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	4,513	3,230
Investments	439	168
Recurring | Level 2 | State and municipal
Assets, Fair Value Disclosure [Abstract]
Trading account assets	2,256	1,995
Investments	1,637	1,849
Recurring | Level 2 | Foreign government
Assets, Fair Value Disclosure [Abstract]
Trading account assets	25,850	31,485
Investments	74,250	61,112
Recurring | Level 2 | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	11,955	16,156
Investments	2,343	2,871
Recurring | Level 2 | Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	10,179	10,047
Investments	165	177
Recurring | Level 2 | Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1,597	981
Investments	1,029	300
Recurring | Level 2 | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	14,963	20,346
Investments	4,194	4,877
Recurring | Level 2 | Non-marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Investments	9	28
Recurring | Level 2 | Trading account liabilities
Liabilities, Fair Value Disclosure [Abstract]
Other trading liabilities	8	5
Recurring | Level 2 | Trading securities (excluding trading account derivatives)
Assets, Fair Value Disclosure [Abstract]
Trading account assets	108,810	120,195
Recurring | Level 2 | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	436,043	378,162
Recurring | Level 2 | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	174,156	161,500
Recurring | Level 2 | Trading account assets | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	186,897	134,912
Recurring | Level 2 | Trading account assets | Equity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	40,683	43,904
Recurring | Level 2 | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	26,823	28,547
Recurring | Level 2 | Trading account assets | Credit derivatives
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	7,484	9,299
Recurring | Level 2 | Non-trading derivatives and other financial assets
Assets, Fair Value Disclosure [Abstract]
Non-trading derivatives and other financial assets measured on a recurring basis, gross	6,291	8,194
Recurring | Level 3
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell	149	231
Investments	2,049	2,227
Loans	1,361	711
Mortgage servicing rights	665	404
Total assets before netting	$ 15,848	$ 14,724
Total as a percentage of gross assets	1.20%	1.10%
Liabilities, Fair Value Disclosure [Abstract]
Interest-bearing deposits	$ 15	$ 183
Securities loaned and sold under agreements to repurchase, gross	1,031	643
Securities sold, not yet purchased	50	65
Other trading liabilities	53	65
Short-term borrowings	38	105
Long-term debt	36,117	25,509
Total liabilities, gross	$ 46,461	$ 35,176
Total as a percentage of gross liabilities	5.60%	4.70%
Recurring | Level 3 | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	$ 9,205	$ 8,670
Recurring | Level 3 | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	3,396	2,172
Recurring | Level 3 | Trading derivatives liabilities | Foreign exchange contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	716	726
Recurring | Level 3 | Trading derivatives liabilities | Equity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	2,808	3,447
Recurring | Level 3 | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	1,223	1,375
Recurring | Level 3 | Trading derivatives liabilities | Credit derivatives
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	1,062	950
Recurring | Level 3 | Non-trading derivatives and other financial liabilities
Liabilities, Fair Value Disclosure [Abstract]
Non-trading derivatives and other financial liabilities measured on recurring basis	2	1
Recurring | Level 3 | Mortgage-backed securities - U.S. government-sponsored agency guaranteed
Assets, Fair Value Disclosure [Abstract]
Trading account assets	600	496
Investments	30	51
Recurring | Level 3 | Mortgage-backed securities - Residential
Assets, Fair Value Disclosure [Abstract]
Trading account assets	166	104
Investments	41	94
Recurring | Level 3 | Mortgage-backed securities - Commercial
Assets, Fair Value Disclosure [Abstract]
Trading account assets	145	81
Investments	0	0
Recurring | Level 3 | Mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	911	681
Investments	71	145
Recurring | Level 3 | U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1	4
Investments	0	1
Recurring | Level 3 | State and municipal
Assets, Fair Value Disclosure [Abstract]
Trading account assets	7	37
Investments	586	772
Recurring | Level 3 | Foreign government
Assets, Fair Value Disclosure [Abstract]
Trading account assets	119	23
Investments	608	786
Recurring | Level 3 | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	394	412
Investments	343	188
Recurring | Level 3 | Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	192	174
Investments	10	16
Recurring | Level 3 | Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	668	613
Investments	1	3
Recurring | Level 3 | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	648	576
Investments	0	0
Recurring | Level 3 | Non-marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Investments	430	316
Recurring | Level 3 | Trading account liabilities
Liabilities, Fair Value Disclosure [Abstract]
Other trading liabilities	3	0
Recurring | Level 3 | Trading securities (excluding trading account derivatives)
Assets, Fair Value Disclosure [Abstract]
Trading account assets	2,940	2,520
Recurring | Level 3 | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	8,627	8,558
Recurring | Level 3 | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	3,751	3,898
Recurring | Level 3 | Trading account assets | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	766	637
Recurring | Level 3 | Trading account assets | Equity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	1,704	1,307
Recurring | Level 3 | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	1,501	1,797
Recurring | Level 3 | Trading account assets | Credit derivatives
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	905	919
Recurring | Level 3 | Non-trading derivatives and other financial assets
Assets, Fair Value Disclosure [Abstract]
Non-trading derivatives and other financial assets measured on a recurring basis, gross	$ 57	$ 73