FAIR VALUE MEASUREMENT - Items Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Assets, Fair Value Disclosure [Abstract]
Federal funds sold and securities borrowed or purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Netting	$ (55,948)	$ (56,390)
Trading account assets	273,747	249,956
Netting of cash collateral received	(53,812)	(43,227)
Investments	353,252	342,955
Loans	4,793	5,005
Mortgage servicing rights (MSRs)	1,524	1,781
Liabilities, Fair Value Disclosure [Abstract]
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase, Netting	(55,948)	(56,390)
Netting of cash collateral paid	(50,994)	(42,609)
Assets transferred from Level 1 to Level 2	200	3,300
Assets transferred from Level 2 to Level 1	1,300	4,400
Liabilities transferred from Level 1 to Level 2	0	400
Liabilities transferred from Level 2 to Level 1	0	600
Investments measured at net asset value excluded from Level 3	839	895
Accounting Standards Update 2015-07
Liabilities, Fair Value Disclosure [Abstract]
Investments measured at net asset value excluded from Level 3	800	900
Mortgage-backed securities - U.S. agency-sponsored
Assets, Fair Value Disclosure [Abstract]
Trading account assets	28,026	24,767
Mortgage-backed securities - Commercial
Assets, Fair Value Disclosure [Abstract]
Trading account assets	2,372	2,855
Mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	31,878	30,007
U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	32,163	17,796
State and municipal securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	3,642	2,696
Foreign government
Assets, Fair Value Disclosure [Abstract]
Trading account assets	62,923	56,609
Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	15,389	14,437
Equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	49,108	56,495
Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	3,567	3,956
Other debt securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	12,033	11,776
Recurring
Assets, Fair Value Disclosure [Abstract]
Federal funds sold and securities borrowed or purchased under agreements to resell	174,491	178,875
Federal funds sold and securities borrowed or purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell, Netting	(32,711)	(40,911)
Federal funds sold and securities borrowed or purchased under agreements to resell, selected portfolios of securities purchased under agreements to resell	141,780	137,964
Investments	309,979	300,329
Loans	4,793	5,005
Mortgage servicing rights (MSRs)	1,524	1,781
Assets before netting	1,491,383	1,311,724
Total assets, Netting	(752,497)	(610,568)
Total assets	738,886	701,156
Liabilities, Fair Value Disclosure [Abstract]
Interest-bearing deposits	1,567	1,590
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase, Gross	70,296	77,754
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase, Netting	(32,711)	(40,911)
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase	37,585	36,843
Securities sold, not yet purchased	73,241	57,827
Trading liabilities	73,377	59,920
Short-term borrowings	1,376	1,207
Long-term debt, at fair value	27,103	25,293
Total liabilities, Gross	953,555	792,123
Total liabilities, Netting	(747,621)	(608,054)
Total liabilities	205,934	184,069
Recurring | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	763,744	611,054
Cash collateral received	13,891	13,628
Total trading derivatives and cash collateral, liability	777,635	624,682
Netting agreements	(663,872)	(524,481)
Netting of cash collateral paid	(50,994)	(42,609)
Netting, Liabilities, total of netting agreements and cash collateral received	(714,866)	(567,090)
Total derivative liabilities	62,769	57,592
Cash collateral received, gross	67,703	56,855
Recurring | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	520,150	395,904
Recurring | Trading derivatives liabilities | Foreign exchange contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	163,005	133,913
Recurring | Trading derivatives liabilities | Equity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	29,398	26,516
Recurring | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	18,661	20,553
Recurring | Trading derivatives liabilities | Credit derivatives
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	32,530	34,168
Recurring | Non-trading derivatives and other financial liabilities
Assets, Fair Value Disclosure [Abstract]
Netting of cash collateral received		(1,949)
Cash collateral paid, gross	55	61
Liabilities, Fair Value Disclosure [Abstract]
Cash collateral received	40	37
Netting of cash collateral paid	(44)	(53)
Netting, Liabilities, total of netting agreements and cash collateral received	(44)
Other liabilities, gross	2,161	1,640
Non-trading derivatives and other financial liabilities measured on a recurring basis, gross	2,201	1,677
Total other assets and cash collateral, gross	2,157	1,624
Cash collateral received, gross	2,142	1,986
Recurring | Trading account liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	136	2,093
Recurring | Mortgage-backed securities - U.S. agency-sponsored
Assets, Fair Value Disclosure [Abstract]
Trading account assets	28,026	24,767
Investments	44,229	39,714
Recurring | Mortgage-backed securities - Residential
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1,480	2,385
Investments	5,553	5,986
Recurring | Mortgage-backed securities - Commercial
Assets, Fair Value Disclosure [Abstract]
Trading account assets	2,372	2,855
Investments	384	571
Recurring | Mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	31,878	30,007
Investments	50,166	46,271
Recurring | U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	32,163	17,796
Investments	120,994	122,915
Recurring | State and municipal securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	3,642	2,696
Investments	11,001	11,459
Recurring | Foreign government
Assets, Fair Value Disclosure [Abstract]
Trading account assets	62,923	56,609
Investments	99,342	92,201
Recurring | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	15,389	14,437
Investments	17,041	15,803
Recurring | Equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	49,108	56,495
Investments	849	625
Recurring | Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	3,567	3,956
Investments	8,787	9,174
Recurring | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	12,033	11,776
Investments	594	688
Recurring | Non-marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Investments	1,205	1,193
Recurring | Trading securities (excluding trading account derivatives)
Assets, Fair Value Disclosure [Abstract]
Trading account assets	210,703	193,772
Recurring | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	774,304	618,981
Gross cash collateral paid	6,424	4,911
Trading derivative, asset, gross net cash collateral paid	780,728	623,892
Less: Netting agreements to assets	(663,872)	(524,481)
Netting of cash collateral received	(53,812)	(43,227)
Netting, Assets, total of netting agreements and cash collateral received	(717,684)	(567,708)
Trading derivatives	63,044	56,184
Cash collateral paid, gross	57,418	47,520
Recurring | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	542,928	414,894
Recurring | Trading account assets | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	158,640	129,317
Recurring | Trading account assets | Equity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	24,180	21,885
Recurring | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	16,033	18,010
Recurring | Trading account assets | Credit derivatives
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	32,523	34,875
Recurring | Non-trading derivatives and other financial assets
Assets, Fair Value Disclosure [Abstract]
Netting of cash collateral received	(2,102)	(1,949)
Netting, Assets, total of netting agreements and cash collateral received	(2,102)	(1,949)
Other assets, gross	9,154	8,062
Cash collateral paid, gross	11	8
Total other assets and cash collateral, gross	9,165	8,070
Other assets	7,063	6,121
Recurring | Level 1
Assets, Fair Value Disclosure [Abstract]
Federal funds sold and securities borrowed or purchased under agreements to resell	0	0
Investments	159,091	157,644
Loans	0	0
Mortgage servicing rights (MSRs)	0	0
Assets before netting	$ 274,668	$ 260,938
Total as a percentage of gross assets	18.50%	20.00%
Liabilities, Fair Value Disclosure [Abstract]
Interest-bearing deposits	$ 0	$ 0
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase, Gross	0	0
Securities sold, not yet purchased	65,618	48,452
Trading liabilities	65,618	48,452
Short-term borrowings	0	0
Long-term debt, at fair value	0	0
Total liabilities, Gross	$ 68,670	$ 50,970
Total as a percentage of gross liabilities	7.30%	6.50%
Recurring | Level 1 | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	$ 3,052	$ 2,518
Recurring | Level 1 | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	54	5
Recurring | Level 1 | Trading derivatives liabilities | Foreign exchange contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	13	6
Recurring | Level 1 | Trading derivatives liabilities | Equity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	2,743	2,244
Recurring | Level 1 | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	242	263
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]
Other liabilities, gross	0	0
Recurring | Level 1 | Trading account liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	0	0
Recurring | Level 1 | Mortgage-backed securities - U.S. agency-sponsored
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	0	0
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	0	0
Investments	0	0
Recurring | Level 1 | U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	28,196	14,208
Investments	109,792	111,536
Recurring | Level 1 | State and municipal securities
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	40,982	35,715
Investments	44,586	42,073
Recurring | Level 1 | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	357	302
Investments	4,067	3,605
Recurring | Level 1 | Equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	42,925	50,429
Investments	646	430
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	0	0
Investments	0	0
Recurring | Level 1 | Non-marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Investments	0	0
Recurring | Level 1 | Trading securities (excluding trading account derivatives)
Assets, Fair Value Disclosure [Abstract]
Trading account assets	112,460	100,654
Recurring | Level 1 | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	3,117	2,640
Recurring | Level 1 | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	52	9
Recurring | Level 1 | Trading account assets | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	49	5
Recurring | Level 1 | Trading account assets | Equity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	2,837	2,422
Recurring | Level 1 | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	179	204
Recurring | Level 1 | Trading account assets | Credit derivatives
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	0	0
Recurring | Level 1 | Non-trading derivatives and other financial assets
Assets, Fair Value Disclosure [Abstract]
Other assets, gross	0	0
Recurring | Level 2
Assets, Fair Value Disclosure [Abstract]
Federal funds sold and securities borrowed or purchased under agreements to resell	172,582	177,538
Investments	146,008	137,626
Loans	3,070	2,839
Mortgage servicing rights (MSRs)	0	0
Assets before netting	$ 1,178,173	$ 1,013,230
Total as a percentage of gross assets	79.30%	77.50%
Liabilities, Fair Value Disclosure [Abstract]
Interest-bearing deposits	$ 1,376	$ 1,156
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase, Gross	69,058	76,507
Securities sold, not yet purchased	7,505	9,176
Trading liabilities	7,641	11,269
Short-term borrowings	1,330	1,198
Long-term debt, at fair value	19,425	18,342
Total liabilities, Gross	$ 848,912	$ 706,709
Total as a percentage of gross liabilities	90.30%	90.80%
Recurring | Level 2 | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	$ 747,935	$ 596,611
Recurring | Level 2 | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	517,020	393,321
Recurring | Level 2 | Trading derivatives liabilities | Foreign exchange contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	162,350	133,404
Recurring | Level 2 | Trading derivatives liabilities | Equity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	24,243	21,875
Recurring | Level 2 | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	15,580	17,329
Recurring | Level 2 | Trading derivatives liabilities | Credit derivatives
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	28,742	30,682
Recurring | Level 2 | Non-trading derivatives and other financial liabilities
Liabilities, Fair Value Disclosure [Abstract]
Other liabilities, gross	2,147	1,626
Recurring | Level 2 | Trading account liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	136	2,093
Recurring | Level 2 | Mortgage-backed securities - U.S. agency-sponsored
Assets, Fair Value Disclosure [Abstract]
Trading account assets	26,987	24,023
Investments	44,118	39,575
Recurring | Level 2 | Mortgage-backed securities - Residential
Assets, Fair Value Disclosure [Abstract]
Trading account assets	288	1,059
Investments	5,553	5,982
Recurring | Level 2 | Mortgage-backed securities - Commercial
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1,791	2,338
Investments	381	569
Recurring | Level 2 | Mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	29,066	27,420
Investments	50,052	46,126
Recurring | Level 2 | U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	3,964	3,587
Investments	11,199	11,375
Recurring | Level 2 | State and municipal securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	3,433	2,345
Investments	8,903	9,267
Recurring | Level 2 | Foreign government
Assets, Fair Value Disclosure [Abstract]
Trading account assets	21,722	20,697
Investments	54,581	49,868
Recurring | Level 2 | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	14,555	13,759
Investments	12,476	11,595
Recurring | Level 2 | Equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	2,428	2,382
Investments	77	71
Recurring | Level 2 | Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	753	1,217
Investments	8,086	8,578
Recurring | Level 2 | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	9,459	9,293
Investments	594	688
Recurring | Level 2 | Non-marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Investments	40	58
Recurring | Level 2 | Trading securities (excluding trading account derivatives)
Assets, Fair Value Disclosure [Abstract]
Trading account assets	85,380	80,700
Recurring | Level 2 | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	762,036	606,645
Recurring | Level 2 | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	540,555	412,802
Recurring | Level 2 | Trading account assets | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	157,654	128,189
Recurring | Level 2 | Trading account assets | Equity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	19,807	17,866
Recurring | Level 2 | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	14,964	16,706
Recurring | Level 2 | Trading account assets | Credit derivatives
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	29,056	31,082
Recurring | Level 2 | Non-trading derivatives and other financial assets
Assets, Fair Value Disclosure [Abstract]
Other assets, gross	9,097	7,882
Recurring | Level 3
Assets, Fair Value Disclosure [Abstract]
Federal funds sold and securities borrowed or purchased under agreements to resell	1,909	1,337
Investments	4,880	5,059
Loans	1,723	2,166
Mortgage servicing rights (MSRs)	1,524	1,781
Assets before netting	$ 32,107	$ 32,637
Total as a percentage of gross assets	2.20%	2.50%
Liabilities, Fair Value Disclosure [Abstract]
Interest-bearing deposits	$ 191	$ 434
Federal funds purchased and securities loaned or sold under agreements to repurchase, selected portfolios of securities sold under agreements to repurchase, Gross	1,238	1,247
Securities sold, not yet purchased	118	199
Trading liabilities	118	199
Short-term borrowings	46	9
Long-term debt, at fair value	7,678	6,951
Total liabilities, Gross	$ 22,042	$ 20,779
Total as a percentage of gross liabilities	2.30%	2.70%
Recurring | Level 3 | Trading derivatives liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	$ 12,757	$ 11,925
Recurring | Level 3 | Trading derivatives liabilities | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	3,076	2,578
Recurring | Level 3 | Trading derivatives liabilities | Foreign exchange contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	642	503
Recurring | Level 3 | Trading derivatives liabilities | Equity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	2,412	2,397
Recurring | Level 3 | Trading derivatives liabilities | Commodity contracts
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	2,839	2,961
Recurring | Level 3 | Trading derivatives liabilities | Credit derivatives
Liabilities, Fair Value Disclosure [Abstract]
Trading derivatives, liability	3,788	3,486
Recurring | Level 3 | Non-trading derivatives and other financial liabilities
Liabilities, Fair Value Disclosure [Abstract]
Other liabilities, gross	14	14
Recurring | Level 3 | Trading account liabilities
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	0	0
Recurring | Level 3 | Mortgage-backed securities - U.S. agency-sponsored
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1,039	744
Investments	111	139
Recurring | Level 3 | Mortgage-backed securities - Residential
Assets, Fair Value Disclosure [Abstract]
Trading account assets	1,192	1,326
Investments	0	4
Recurring | Level 3 | Mortgage-backed securities - Commercial
Assets, Fair Value Disclosure [Abstract]
Trading account assets	581	517
Investments	3	2
Recurring | Level 3 | Mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	2,812	2,587
Investments	114	145
Recurring | Level 3 | U.S. Treasury and federal agency securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	3	1
Investments	3	4
Recurring | Level 3 | State and municipal securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	209	351
Investments	2,098	2,192
Recurring | Level 3 | Foreign government
Assets, Fair Value Disclosure [Abstract]
Trading account assets	219	197
Investments	175	260
Recurring | Level 3 | Corporate
Assets, Fair Value Disclosure [Abstract]
Trading account assets	477	376
Investments	498	603
Recurring | Level 3 | Equity securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	3,755	3,684
Investments	126	124
Recurring | Level 3 | Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	2,814	2,739
Investments	701	596
Recurring | Level 3 | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Trading account assets	2,574	2,483
Investments	0	0
Recurring | Level 3 | Non-marketable equity securities
Assets, Fair Value Disclosure [Abstract]
Investments	1,165	1,135
Recurring | Level 3 | Trading securities (excluding trading account derivatives)
Assets, Fair Value Disclosure [Abstract]
Trading account assets	12,863	12,418
Recurring | Level 3 | Trading account assets
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	9,151	9,696
Recurring | Level 3 | Trading account assets | Interest rate contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	2,321	2,083
Recurring | Level 3 | Trading account assets | Foreign exchange contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	937	1,123
Recurring | Level 3 | Trading account assets | Equity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	1,536	1,597
Recurring | Level 3 | Trading account assets | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	890	1,100
Recurring | Level 3 | Trading account assets | Credit derivatives
Assets, Fair Value Disclosure [Abstract]
Trading derivatives, asset, Gross	3,467	3,793
Recurring | Level 3 | Non-trading derivatives and other financial assets
Assets, Fair Value Disclosure [Abstract]
Other assets, gross	$ 57	$ 180