Derivatives, Notional or Contractual Amounts and Fair Values of Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	$ 34,779	$ 36,355
Fair value derivative assets, netting	(22,968)	(24,127)
Net amounts in consolidated balance sheet, assets	11,811	12,228
Fair value derivative liabilities	32,670	34,298
Fair value derivative liabilities, netting	(24,084)	(25,502)
Net amounts in consolidated balance sheet, liabilities	8,586	8,796
Interest rate contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(10,905)	(11,929)
Net amounts in consolidated balance sheet, assets	5,158	5,701
Fair value derivative liabilities, netting	(11,982)	(13,226)
Net amounts in consolidated balance sheet, liabilities	3,561	2,246
Commodity contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(1,165)	(966)
Net amounts in consolidated balance sheet, assets	3,040	1,388
Fair value derivative liabilities, netting	(823)	(648)
Net amounts in consolidated balance sheet, liabilities	893	687
Equity contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(5,646)	(4,233)
Net amounts in consolidated balance sheet, assets	2,177	2,774
Fair value derivative liabilities, netting	(5,949)	(4,041)
Net amounts in consolidated balance sheet, liabilities	2,775	4,460
Foreign exchange contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(5,036)	(6,656)
Net amounts in consolidated balance sheet, assets	1,398	2,317
Fair value derivative liabilities, netting	(5,023)	(7,189)
Net amounts in consolidated balance sheet, liabilities	1,346	1,379
Credit Contracts Protection Sold [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(92)	(145)
Net amounts in consolidated balance sheet, assets	2	2
Fair value derivative liabilities, netting	(140)	(204)
Net amounts in consolidated balance sheet, liabilities	1	10
Credit Contracts Protection Purchased [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(124)	(198)
Net amounts in consolidated balance sheet, assets	36	46
Fair value derivative liabilities, netting	(167)	(194)
Net amounts in consolidated balance sheet, liabilities	10	14
Designated as Hedging Instrument [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	3,208	3,974
Fair value derivative liabilities	1,871	2,229
Designated as Hedging Instrument [Member] \| Interest rate contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	184,332	209,677
Fair value derivative assets	2,471	2,492
Fair value derivative liabilities	650	1,092
Designated as Hedging Instrument [Member] \| Foreign exchange contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	35,136	34,135
Fair value derivative assets	737	1,482
Fair value derivative liabilities	1,221	1,137
Not Designated as Hedging Instrument [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	31,571	32,381
Fair value derivative liabilities	30,799	32,069
Not Designated as Hedging Instrument [Member] \| Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	1,236	990
Fair value derivative liabilities	701	648
Not Designated as Hedging Instrument [Member] \| Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	30,335	31,391
Fair value derivative liabilities	30,098	31,421
Not Designated as Hedging Instrument [Member] \| Interest rate contract [Member] \| Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	181,607	220,558
Fair value derivative assets	166	159
Fair value derivative liabilities	375	201
Not Designated as Hedging Instrument [Member] \| Interest rate contract [Member] \| Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	8,156,678	6,434,673
Fair value derivative assets	13,426	14,979
Fair value derivative liabilities	14,518	14,179
Not Designated as Hedging Instrument [Member] \| Commodity contract [Member] \| Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	72,559	62,530
Fair value derivative assets	4,205	2,354
Fair value derivative liabilities	1,716	1,335
Not Designated as Hedging Instrument [Member] \| Equity contract [Member] \| Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	15,764	12,315
Fair value derivative assets	929	716
Fair value derivative liabilities	210	138
Not Designated as Hedging Instrument [Member] \| Equity contract [Member] \| Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	229,905	213,750
Fair value derivative assets	6,894	6,291
Fair value derivative liabilities	8,514	8,363
Not Designated as Hedging Instrument [Member] \| Foreign exchange contract [Member] \| Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	14,288	15,976
Fair value derivative assets	115	78
Fair value derivative liabilities	116	309
Not Designated as Hedging Instrument [Member] \| Foreign exchange contract [Member] \| Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	333,715	362,896
Fair value derivative assets	5,582	7,413
Fair value derivative liabilities	5,032	7,122
Not Designated as Hedging Instrument [Member] \| Credit Contracts Protection Sold [Member] \| Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	9,185	9,021
Fair value derivative assets	94	147
Fair value derivative liabilities	141	214
Not Designated as Hedging Instrument [Member] \| Credit Contracts Protection Purchased [Member] \| Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	101	111
Fair value derivative assets	26	37
Fair value derivative liabilities	0	0
Not Designated as Hedging Instrument [Member] \| Credit Contracts Protection Purchased [Member] \| Customer accommodation trading, and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	17,973	17,406
Fair value derivative assets	134	207
Fair value derivative liabilities	177	208
Basis swap [Member] \| Designated as Hedging Instrument [Member] \| Interest rate contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	0	500
Basis swap [Member] \| Designated as Hedging Instrument [Member] \| Foreign exchange contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	$ 11,300	$ 13,500

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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