Fair Value Measurement - Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	$ 922,616	$ 961,878
Amounts netted on the Consolidated balance sheets	(858,538)	(902,201)
Derivative receivables balance	64,078	59,677
Trading assets	372,130	343,839
Available-for-sale securities	238,891	241,754
Loans	2,230	2,861
Mortgage servicing rights	6,096	6,608	$ 7,436	$ 9,614
Derivative payables, gross	893,239	942,912
Derivative netting adjustments	(844,008)	(890,122)
Derivative payables, net	49,231	52,790
Fair value assets and liabilities measured on recurring basis - supplemental data
Alternative investments, net asset value, fair value	1,000	1,200
Costs of the private equity investment portfolio	2,500	3,500
Trading assets
Fair value assets and liabilities measured on recurring basis - supplemental data
Alternative investments, net asset value, fair value	52	61
Other assets
Fair value assets and liabilities measured on recurring basis - supplemental data
Alternative investments, net asset value, fair value	1,000	1,200
Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	605,963	669,611
Amounts netted on the Consolidated balance sheets	(577,661)	(643,248)
Derivative receivables balance	28,302	26,363
Derivative payables, gross	570,778	635,166
Derivative netting adjustments	(559,963)	(624,945)
Derivative payables, net	10,815	10,221
Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	29,645	51,468
Amounts netted on the Consolidated balance sheets	(28,351)	(50,045)
Derivative receivables balance	1,294	1,423
Derivative payables, gross	28,666	50,529
Derivative netting adjustments	(27,255)	(48,988)
Derivative payables, net	1,411	1,541
Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	233,426	179,875
Amounts netted on the Consolidated balance sheets	(210,154)	(162,698)
Derivative receivables balance	23,271	17,177
Derivative payables, gross	234,971	190,900
Derivative netting adjustments	(214,463)	(171,131)
Derivative payables, net	20,508	19,769
Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	34,940	35,859
Amounts netted on the Consolidated balance sheets	(30,001)	(30,330)
Derivative receivables balance	4,939	5,529
Derivative payables, gross	38,362	38,663
Derivative netting adjustments	(30,222)	(29,480)
Derivative payables, net	8,140	9,183
Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	18,642	25,065
Amounts netted on the Consolidated balance sheets	(12,371)	(15,880)
Derivative receivables balance	6,272	9,185
Derivative payables, gross	20,462	27,654
Derivative netting adjustments	(12,105)	(15,578)
Derivative payables, net	8,357	12,076
Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	9,100	7,600
US government-sponsored and enterprises obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	45,800	42,300
Residential mortgage
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	16,500	11,800
Commercial mortgage
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	3,300	4,300
Residential conforming mortgage intended for sale to government agency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	11,000	5,300
Reverse mortgage
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	2,000	2,500
Recurring
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Federal funds sold and securities purchased under resale agreements	21,506	23,141
Securities borrowed	0	395
Trading assets	308,000	284,101
Amounts netted on the Consolidated balance sheets	(858,538)	(902,201)
Derivative receivables balance	64,078	59,677
Trading assets	372,078	343,778
Available-for-sale securities	238,891	241,754
Loans	2,230	2,861
Mortgage servicing rights	6,096	6,608
Total assets measured at fair value on a recurring basis	647,381	624,984
Deposits	13,912	12,516
Federal funds purchased and securities loaned or sold under repurchase agreements	687	3,526
Other borrowed funds	9,105	9,911
Trading liabilities, Debt and equity instruments	87,428	74,107
Derivative netting adjustments	(844,008)	(890,122)
Derivative payables, net	49,231	52,790
Trading liabilities	136,659	126,897
Accounts payable and other liabilities	9,120	4,401
Beneficial interests issued by consolidated VIEs	120	787
Long-term debt	37,686	33,065
Total liabilities measured at fair value on a recurring basis	207,289	191,103
Recurring | Private equity investments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	1,674	1,860
Recurring | All other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	4,906	4,587
Recurring | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	6,580	6,447
Recurring | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Amounts netted on the Consolidated balance sheets	(577,661)	(643,248)
Derivative receivables balance	28,302	26,363
Derivative netting adjustments	(559,963)	(624,945)
Derivative payables, net	10,815	10,221
Recurring | Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Amounts netted on the Consolidated balance sheets	(28,351)	(50,045)
Derivative receivables balance	1,294	1,423
Derivative netting adjustments	(27,255)	(48,988)
Derivative payables, net	1,411	1,541
Recurring | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Amounts netted on the Consolidated balance sheets	(210,154)	(162,698)
Derivative receivables balance	23,271	17,177
Derivative netting adjustments	(214,463)	(171,131)
Derivative payables, net	20,508	19,769
Recurring | Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Amounts netted on the Consolidated balance sheets	(30,001)	(30,330)
Derivative receivables balance	4,939	5,529
Derivative netting adjustments	(30,222)	(29,480)
Derivative payables, net	8,140	9,183
Recurring | Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Amounts netted on the Consolidated balance sheets	(12,371)	(15,880)
Derivative receivables balance	6,272	9,185
Derivative netting adjustments	(12,105)	(15,578)
Derivative payables, net	8,357	12,076
Recurring | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	193,666	172,618
Recurring | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	43,964	35,224
Available-for-sale securities	87,552	105,582
Recurring | Mortgage-backed securities, U.S. government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	40,991	32,536
Available-for-sale securities	64,005	55,066
Recurring | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	1,635	1,493
Available-for-sale securities	14,443	27,619
Recurring | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	1,338	1,195
Available-for-sale securities	9,104	22,897
Recurring | U.S. Treasury and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	24,755	19,021
Available-for-sale securities	44,101	11,036
Recurring | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	9,052	7,637
Available-for-sale securities	31,592	33,550
Recurring | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	1,649	1,042
Recurring | Certificates of deposit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	106	283
Recurring | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	51,565	53,112
Available-for-sale securities	35,288	36,676
Recurring | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	23,327	23,543
Available-for-sale securities	4,958	12,436
Recurring | Loans
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	33,802	28,815
Recurring | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	5,552	4,224
Recurring | Asset-backed securities, Collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	27,401	31,007
Recurring | Asset-backed securities, other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	6,967	9,097
Recurring | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	97,271	94,930
Available-for-sale securities	926	2,087
Recurring | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	6,961	4,657
Recurring | Other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	10,102	11,896
Recurring | US government-sponsored and enterprises obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	80,600	67,000
Recurring | Level 1
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Federal funds sold and securities purchased under resale agreements	0	0
Securities borrowed	0	0
Trading assets	150,110	137,668
Gross derivative receivables	1,685	1,196
Trading assets	151,795	138,864
Available-for-sale securities	67,791	36,284
Loans	0	0
Mortgage servicing rights	0	0
Total assets measured at fair value on a recurring basis	223,943	179,065
Deposits	0	0
Federal funds purchased and securities loaned or sold under repurchase agreements	0	0
Other borrowed funds	0	0
Trading liabilities, Debt and equity instruments	68,304	53,845
Derivative payables, gross	1,614	937
Trading liabilities	69,918	54,782
Accounts payable and other liabilities	9,107	4,382
Beneficial interests issued by consolidated VIEs	0	0
Long-term debt	0	0
Total liabilities measured at fair value on a recurring basis	79,025	59,164
Recurring | Level 1 | Private equity investments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	68	102
Recurring | Level 1 | All other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	4,289	3,815
Recurring | Level 1 | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	4,357	3,917
Recurring | Level 1 | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	715	354
Derivative payables, gross	539	216
Recurring | Level 1 | Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	0	0
Derivative payables, gross	0	0
Recurring | Level 1 | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	812	734
Derivative payables, gross	902	669
Recurring | Level 1 | Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	0	0
Derivative payables, gross	0	0
Recurring | Level 1 | Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	158	108
Derivative payables, gross	173	52
Recurring | Level 1 | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	48,010	40,016
Recurring | Level 1 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	13	6
Available-for-sale securities	0	0
Recurring | Level 1 | Mortgage-backed securities, U.S. government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	13	6
Available-for-sale securities	0	0
Recurring | Level 1 | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	0	0
Available-for-sale securities	0	0
Recurring | Level 1 | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	0	0
Available-for-sale securities	0	0
Recurring | Level 1 | U.S. Treasury and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	19,554	12,036
Available-for-sale securities	44,072	10,998
Recurring | Level 1 | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	0	0
Available-for-sale securities	0	0
Recurring | Level 1 | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	0	0
Recurring | Level 1 | Certificates of deposit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	0	0
Recurring | Level 1 | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	28,443	27,974
Available-for-sale securities	22,793	23,199
Recurring | Level 1 | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	0	0
Available-for-sale securities	0	0
Recurring | Level 1 | Loans
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	0	0
Recurring | Level 1 | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	0	0
Recurring | Level 1 | Asset-backed securities, Collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	0	0
Recurring | Level 1 | Asset-backed securities, other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	0	0
Recurring | Level 1 | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	96,759	94,059
Available-for-sale securities	926	2,087
Recurring | Level 1 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	5,341	3,593
Recurring | Level 1 | Other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	0	0
Recurring | Level 2
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Federal funds sold and securities purchased under resale agreements	21,506	23,141
Securities borrowed	0	395
Trading assets	149,996	134,503
Gross derivative receivables	915,138	952,736
Trading assets	1,065,134	1,087,239
Available-for-sale securities	170,436	204,646
Loans	1,660	1,343
Mortgage servicing rights	0	0
Total assets measured at fair value on a recurring basis	1,258,736	1,316,893
Deposits	11,795	9,566
Federal funds purchased and securities loaned or sold under repurchase agreements	687	3,526
Other borrowed funds	7,971	9,272
Trading liabilities, Debt and equity instruments	19,081	20,199
Derivative payables, gross	883,472	932,280
Trading liabilities	902,553	952,479
Accounts payable and other liabilities	0	0
Beneficial interests issued by consolidated VIEs	72	238
Long-term debt	23,792	21,452
Total liabilities measured at fair value on a recurring basis	946,870	996,533
Recurring | Level 2 | Private equity investments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	0	101
Recurring | Level 2 | All other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	0	28
Recurring | Level 2 | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	0	129
Recurring | Level 2 | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	602,747	666,491
Derivative payables, gross	569,001	633,060
Recurring | Level 2 | Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	28,256	48,850
Derivative payables, gross	27,375	48,460
Recurring | Level 2 | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	231,743	177,525
Derivative payables, gross	231,815	187,890
Recurring | Level 2 | Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	34,032	35,150
Derivative payables, gross	35,202	36,440
Recurring | Level 2 | Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	18,360	24,720
Derivative payables, gross	20,079	26,430
Recurring | Level 2 | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	138,754	121,681
Recurring | Level 2 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	43,459	34,194
Available-for-sale securities	87,551	105,581
Recurring | Level 2 | Mortgage-backed securities, U.S. government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	40,586	31,815
Available-for-sale securities	64,005	55,066
Recurring | Level 2 | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	1,552	1,299
Available-for-sale securities	14,442	27,618
Recurring | Level 2 | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	1,321	1,080
Available-for-sale securities	9,104	22,897
Recurring | Level 2 | U.S. Treasury and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	5,201	6,985
Available-for-sale securities	29	38
Recurring | Level 2 | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	8,403	6,986
Available-for-sale securities	31,592	33,550
Recurring | Level 2 | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	1,649	1,042
Recurring | Level 2 | Certificates of deposit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	106	283
Recurring | Level 2 | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	23,076	25,064
Available-for-sale securities	12,495	13,477
Recurring | Level 2 | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	22,751	22,807
Available-for-sale securities	4,958	12,436
Recurring | Level 2 | Loans
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	28,965	22,211
Recurring | Level 2 | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	5,250	2,392
Recurring | Level 2 | Asset-backed securities, Collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	26,738	30,248
Recurring | Level 2 | Asset-backed securities, other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	6,967	9,033
Recurring | Level 2 | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	281	606
Available-for-sale securities	0	0
Recurring | Level 2 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	1,620	1,064
Recurring | Level 2 | Other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	9,341	11,152
Recurring | Level 3
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Federal funds sold and securities purchased under resale agreements	0	0
Securities borrowed	0	0
Trading assets	7,894	11,930
Gross derivative receivables	5,793	7,946
Trading assets	13,687	19,876
Available-for-sale securities	664	824
Loans	570	1,518
Mortgage servicing rights	6,096	6,608
Total assets measured at fair value on a recurring basis	23,240	31,227
Deposits	2,117	2,950
Federal funds purchased and securities loaned or sold under repurchase agreements	0	0
Other borrowed funds	1,134	639
Trading liabilities, Debt and equity instruments	43	63
Derivative payables, gross	8,153	9,695
Trading liabilities	8,196	9,758
Accounts payable and other liabilities	13	19
Beneficial interests issued by consolidated VIEs	48	549
Long-term debt	13,894	11,613
Total liabilities measured at fair value on a recurring basis	25,402	25,528
Recurring | Level 3 | Private equity investments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	1,606	1,657
Recurring | Level 3 | All other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	617	744
Recurring | Level 3 | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other	2,223	2,401
Recurring | Level 3 | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	2,501	2,766
Derivative payables, gross	1,238	1,890
Recurring | Level 3 | Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	1,389	2,618
Derivative payables, gross	1,291	2,069
Recurring | Level 3 | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	870	1,616
Derivative payables, gross	2,254	2,341
Recurring | Level 3 | Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	908	709
Derivative payables, gross	3,160	2,223
Recurring | Level 3 | Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Gross derivative receivables	125	237
Derivative payables, gross	210	1,172
Recurring | Level 3 | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	6,902	10,921
Recurring | Level 3 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	492	1,024
Available-for-sale securities	1	1
Recurring | Level 3 | Mortgage-backed securities, U.S. government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	392	715
Available-for-sale securities	0	0
Recurring | Level 3 | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	83	194
Available-for-sale securities	1	1
Recurring | Level 3 | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	17	115
Available-for-sale securities	0	0
Recurring | Level 3 | U.S. Treasury and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	0	0
Available-for-sale securities	0	0
Recurring | Level 3 | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	649	651
Available-for-sale securities	0	0
Recurring | Level 3 | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	0	0
Recurring | Level 3 | Certificates of deposit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	0	0
Recurring | Level 3 | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	46	74
Available-for-sale securities	0	0
Recurring | Level 3 | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	576	736
Available-for-sale securities	0	0
Recurring | Level 3 | Loans
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	4,837	6,604
Recurring | Level 3 | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	302	1,832
Recurring | Level 3 | Asset-backed securities, Collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	663	759
Recurring | Level 3 | Asset-backed securities, other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	0	64
Recurring | Level 3 | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	231	265
Available-for-sale securities	0	0
Recurring | Level 3 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	0	0
Recurring | Level 3 | Other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	$ 761	$ 744