FAIR VALUE MEASUREMENT - Items Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Netting	$ (248,214)	$ (112,391)
Securities borrowed and purchased under resale agreements	345,700	365,401
Trading account assets	411,756	334,114
Less: Netting agreements to assets	(308,431)	(346,545)
Less: Netting of cash collateral received	(21,226)	(23,136)
Trading derivatives	57,717	75,306
Investments	519,085	526,582
Loans	7,594	5,360
Total Non-trading derivatives and other financial assets measured on a recurring basis, gross	12,290	10,658
Liabilities, Fair Value Disclosure [Abstract]
Securities loaned and sold under agreements to repurchase, netting	(248,214)	(112,391)
Netting agreements	(308,431)	(346,545)
Netting of cash collateral paid	(26,101)	(30,032)
Total derivative liabilities	50,679	59,916
Short-term borrowings	37,457	47,096
Long-term debt	286,619	271,606
Fair value
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under resale agreements		239,527
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell	139,700	125,900
Loans	673,200	634,900
Non-trading derivatives and other financial assets measured on a recurring basis, net	347,500	427,100
Liabilities, Fair Value Disclosure [Abstract]
Securities loaned and sold under agreements to repurchase	215,600	131,600
Short-term borrowings	6,545	6,222
Long-term debt	173,400	160,500
Long-term debt	116,338	105,995
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross	132,800	142,400
Total non-trading derivatives and other financial liabilities measured on recurring basis	4,434
Non-marketable equity securities | Fair value
Assets, Fair Value Disclosure [Abstract]
Investments	508	466
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	243,100	320,000
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	139,700	125,900
Loans	0	0
Non-trading derivatives and other financial assets measured on a recurring basis, net	17,800	22,000
Liabilities, Fair Value Disclosure [Abstract]
Securities loaned and sold under agreements to repurchase	215,600	131,600
Long-term debt	168,000	151,100
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross	29,200	26,500
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	0
Loans	673,200	634,900
Non-trading derivatives and other financial assets measured on a recurring basis, net	86,600	85,100
Liabilities, Fair Value Disclosure [Abstract]
Securities loaned and sold under agreements to repurchase	0	0
Long-term debt	5,400	9,400
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross	103,600	115,900
Fair Value Measured at Net Asset Value Per Share
Liabilities, Fair Value Disclosure [Abstract]
Alternative investment funds, fair value	25	27
Recurring
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell	453,854	350,294
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Netting	(247,795)	(110,767)
Securities borrowed and purchased under resale agreements	206,059
Securities borrowed and purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell		239,527
Investments	257,677	250,547
Loans	7,594	5,360
Mortgage servicing rights	691	665
Total assets before netting	1,474,257	1,321,319
Total assets, netting	(577,452)	(480,448)
Total assets	896,805	840,871
Liabilities, Fair Value Disclosure [Abstract]
Interest-bearing deposits	2,440	1,875
Securities loaned and sold under agreements to repurchase, gross	228,438	156,853
Securities loaned and sold under agreements to repurchase, netting	(165,953)	(85,967)
Securities loaned and sold under agreements to repurchase	62,485	70,886
Securities sold, not yet purchased	104,658	110,720
Other trading liabilities	104,666	110,731
Short-term borrowings	6,545	6,222
Long-term debt	116,338	105,995
Total liabilities, gross	848,072	822,608
Total liabilities, netting	(500,485)	(462,544)
Total liabilities	347,587	360,064
Recurring | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	385,211	436,493
Netting agreements	(308,431)	(346,545)
Netting of cash collateral paid	(26,101)	(30,032)
Total trading derivatives—after netting and collateral, gross	385,211	436,493
Netting, Liabilities, total of netting agreements and cash collateral received	(334,532)	(376,577)
Total derivative liabilities	50,679	59,916
Recurring | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	153,186	172,620
Recurring | Trading derivatives liabilities | Foreign exchange contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	157,201	185,995
Recurring | Trading derivatives liabilities | Equity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	47,946	43,783
Recurring | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	18,796	26,318
Recurring | Trading derivatives liabilities | Credit derivatives
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	8,082	7,777
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	4,434	4,439
Total non-trading derivatives and other financial liabilities measured on recurring basis		4,439
Recurring | U.S. government-sponsored agency guaranteed
Assets, Fair Value Disclosure [Abstract]
Trading account assets	80,376	35,478
Investments	29,715	11,262
Recurring | Residential
Assets, Fair Value Disclosure [Abstract]
Trading account assets	714	1,988
Investments	423	485
Recurring | Commercial
Assets, Fair Value Disclosure [Abstract]
Trading account assets	666	943
Investments	1	2
Recurring | Mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	81,756	38,409
Investments	30,139	11,749
Recurring | U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	115,256	67,581
Investments	80,361	92,290
Recurring | State and municipal
Assets, Fair Value Disclosure [Abstract]
Trading account assets	597	2,263
Investments	2,131	2,223
Recurring | Foreign government
Assets, Fair Value Disclosure [Abstract]
Trading account assets	72,495	64,352
Investments	131,198	133,277
Recurring | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	19,074	13,942
Investments	5,412	4,916
Recurring | Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	45,393	54,361
Investments	258	429
Recurring | Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1,754	2,265
Investments	938	1,030
Recurring | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	17,714	15,635
Investments	6,757	4,194
Recurring | Non-marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Investments	483	439
Recurring | Trading account liabilities
Liabilities, Fair Value Disclosure [Abstract]
Other trading liabilities	8	11
Recurring | Trading securities (excluding trading account derivatives)
Assets, Fair Value Disclosure [Abstract]
Trading account assets	354,039	258,808
Recurring | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	387,374	444,987
Trading derivative, asset, after netting and collateral	387,374	444,987
Less: Netting agreements to assets	(308,431)	(346,545)
Less: Netting of cash collateral received	(21,226)	(23,136)
Netting, assets	(329,657)	(369,681)
Trading derivatives	57,717	75,306
Recurring | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	158,494	178,204
Recurring | Trading account assets | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	159,694	187,663
Recurring | Trading account assets | Equity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	43,278	42,407
Recurring | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	17,569	28,324
Recurring | Trading account assets | Credit derivatives
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	8,339	8,389
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	13,028	10,658
Non-trading derivatives and other financial assets measured on a recurring basis, net		10,658
Recurring | Level 1
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell	0	0
Investments	143,034	152,754
Loans	0	0
Mortgage servicing rights	0	0
Total assets before netting	$ 339,746	$ 304,439
Total as a percentage of gross assets	23.00%	23.00%
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	91,163	97,559
Other trading liabilities	91,163	97,559
Short-term borrowings	0	0
Long-term debt	0	0
Total liabilities, gross	$ 95,528	$ 102,003
Total as a percentage of gross liabilities	11.30%	12.40%
Recurring | Level 1 | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	$ 67	$ 247
Recurring | Level 1 | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	49	175
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	18	70
Recurring | Level 1 | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	0	2
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	4,298	4,197
Recurring | Level 1 | U.S. government-sponsored agency guaranteed
Assets, Fair Value Disclosure [Abstract]
Trading account assets	0	0
Investments	0	0
Recurring | Level 1 | Residential
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1	1
Investments	0	0
Recurring | Level 1 | 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	112,851	63,067
Investments	80,062	91,851
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	44,203	38,383
Investments	60,133	58,419
Recurring | Level 1 | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1,858	1,593
Investments	2,680	2,230
Recurring | Level 1 | Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	32,966	43,990
Investments	159	254
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	97	24
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	191,976	147,058
Recurring | Level 1 | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	59	317
Recurring | Level 1 | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	49	297
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	8	20
Recurring | Level 1 | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	2	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	4,677	4,310
Recurring | Level 2
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell	453,715	350,145
Investments	112,844	95,744
Loans	7,167	3,999
Mortgage servicing rights	0	0
Total assets before netting	$ 1,121,860	$ 1,001,032
Total as a percentage of gross assets	76.10%	75.80%
Liabilities, Fair Value Disclosure [Abstract]
Interest-bearing deposits	$ 2,411	$ 1,860
Securities loaned and sold under agreements to repurchase, gross	228,048	155,822
Securities sold, not yet purchased	13,460	13,111
Other trading liabilities	13,468	13,119
Short-term borrowings	6,064	6,184
Long-term debt	77,958	69,878
Total liabilities, gross	$ 704,559	$ 674,144
Total as a percentage of gross liabilities	83.00%	82.00%
Recurring | Level 2 | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	$ 376,480	$ 427,041
Recurring | Level 2 | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	149,914	169,049
Recurring | Level 2 | Trading derivatives liabilities | Foreign exchange contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	156,474	185,279
Recurring | Level 2 | Trading derivatives liabilities | Equity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	44,894	40,905
Recurring | Level 2 | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	17,964	25,093
Recurring | Level 2 | Trading derivatives liabilities | Credit derivatives
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	7,234	6,715
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	130	240
Recurring | Level 2 | U.S. government-sponsored agency guaranteed
Assets, Fair Value Disclosure [Abstract]
Trading account assets	79,795	34,878
Investments	29,640	11,232
Recurring | Level 2 | Residential
Assets, Fair Value Disclosure [Abstract]
Trading account assets	597	1,821
Investments	307	444
Recurring | Level 2 | Commercial
Assets, Fair Value Disclosure [Abstract]
Trading account assets	464	798
Investments	1	2
Recurring | Level 2 | Mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	80,856	37,497
Investments	29,948	11,678
Recurring | Level 2 | U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	2,398	4,513
Investments	299	439
Recurring | Level 2 | State and municipal
Assets, Fair Value Disclosure [Abstract]
Trading account assets	594	2,256
Investments	1,589	1,637
Recurring | Level 2 | Foreign government
Assets, Fair Value Disclosure [Abstract]
Trading account assets	28,238	25,850
Investments	70,871	74,250
Recurring | Level 2 | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	16,716	11,955
Investments	2,370	2,343
Recurring | Level 2 | Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	12,135	10,179
Investments	72	165
Recurring | Level 2 | Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1,223	1,597
Investments	938	1,029
Recurring | Level 2 | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	16,784	14,963
Investments	6,757	4,194
Recurring | Level 2 | Non-marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Investments	0	9
Recurring | Level 2 | Trading account liabilities
Liabilities, Fair Value Disclosure [Abstract]
Other trading liabilities	8	8
Recurring | Level 2 | Trading securities (excluding trading account derivatives)
Assets, Fair Value Disclosure [Abstract]
Trading account assets	158,944	108,810
Recurring | Level 2 | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	380,869	436,043
Recurring | Level 2 | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	156,307	174,156
Recurring | Level 2 | Trading account assets | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	158,672	186,897
Recurring | Level 2 | Trading account assets | Equity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	41,870	40,683
Recurring | Level 2 | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	16,456	26,823
Recurring | Level 2 | Trading account assets | Credit derivatives
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	7,564	7,484
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	8,321	6,291
Recurring | Level 3
Assets, Fair Value Disclosure [Abstract]
Securities borrowed and purchased under agreements to resell	139	149
Investments	1,799	2,049
Loans	427	1,361
Mortgage servicing rights	691	665
Total assets before netting	$ 12,651	$ 15,848
Total as a percentage of gross assets	0.90%	1.20%
Liabilities, Fair Value Disclosure [Abstract]
Interest-bearing deposits	$ 29	$ 15
Securities loaned and sold under agreements to repurchase, gross	390	1,031
Securities sold, not yet purchased	35	50
Other trading liabilities	35	53
Short-term borrowings	481	38
Long-term debt	38,380	36,117
Total liabilities, gross	$ 47,985	$ 46,461
Total as a percentage of gross liabilities	5.70%	5.60%
Recurring | Level 3 | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	$ 8,664	$ 9,205
Recurring | Level 3 | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	3,223	3,396
Recurring | Level 3 | Trading derivatives liabilities | Foreign exchange contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	727	716
Recurring | Level 3 | Trading derivatives liabilities | Equity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	3,034	2,808
Recurring | Level 3 | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	832	1,223
Recurring | Level 3 | Trading derivatives liabilities | Credit derivatives
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	848	1,062
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	6	2
Recurring | Level 3 | U.S. government-sponsored agency guaranteed
Assets, Fair Value Disclosure [Abstract]
Trading account assets	581	600
Investments	75	30
Recurring | Level 3 | Residential
Assets, Fair Value Disclosure [Abstract]
Trading account assets	116	166
Investments	116	41
Recurring | Level 3 | Commercial
Assets, Fair Value Disclosure [Abstract]
Trading account assets	202	145
Investments	0	0
Recurring | Level 3 | Mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	899	911
Investments	191	71
Recurring | Level 3 | U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	7	1
Investments	0	0
Recurring | Level 3 | State and municipal
Assets, Fair Value Disclosure [Abstract]
Trading account assets	3	7
Investments	542	586
Recurring | Level 3 | Foreign government
Assets, Fair Value Disclosure [Abstract]
Trading account assets	54	119
Investments	194	608
Recurring | Level 3 | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	500	394
Investments	362	343
Recurring | Level 3 | Marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	292	192
Investments	27	10
Recurring | Level 3 | Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	531	668
Investments	0	1
Recurring | Level 3 | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	833	648
Investments	0	0
Recurring | Level 3 | Non-marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Investments	483	430
Recurring | Level 3 | Trading account liabilities
Liabilities, Fair Value Disclosure [Abstract]
Other trading liabilities	0	3
Recurring | Level 3 | Trading securities (excluding trading account derivatives)
Assets, Fair Value Disclosure [Abstract]
Trading account assets	3,119	2,940
Recurring | Level 3 | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	6,446	8,627
Recurring | Level 3 | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	2,138	3,751
Recurring | Level 3 | Trading account assets | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	1,022	766
Recurring | Level 3 | Trading account assets | Equity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	1,400	1,704
Recurring | Level 3 | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	1,111	1,501
Recurring | Level 3 | Trading account assets | Credit derivatives
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, before netting and collateral	775	905
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	$ 30	$ 57