Derivatives, Notional or Contractual Amounts and Fair Values of Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	$ 40,050	$ 34,560
Fair value derivative assets, netting	(26,888)	(23,790)
Net amounts in consolidated balance sheet, assets	13,162	10,770
Fair value derivative liabilities	38,116	32,047
Fair value derivative liabilities, netting	(29,717)	(23,548)
Net amounts in consolidated balance sheet, liabilities	8,399	8,499
Interest rate contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(16,558)	(12,029)
Net amounts in consolidated balance sheet, assets	8,995	6,406
Fair value derivative liabilities, netting	(18,046)	(13,152)
Net amounts in consolidated balance sheet, liabilities	2,591	3,156
Commodity contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(951)	(849)
Net amounts in consolidated balance sheet, assets	473	739
Fair value derivative liabilities, netting	(738)	(727)
Net amounts in consolidated balance sheet, liabilities	1,198	1,609
Equity contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(5,041)	(5,318)
Net amounts in consolidated balance sheet, assets	2,336	2,227
Fair value derivative liabilities, netting	(5,934)	(3,877)
Net amounts in consolidated balance sheet, liabilities	3,244	2,133
Foreign exchange contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(4,250)	(5,355)
Net amounts in consolidated balance sheet, assets	1,305	1,359
Fair value derivative liabilities, netting	(4,918)	(5,522)
Net amounts in consolidated balance sheet, liabilities	1,350	1,591
Credit Contracts Protection Sold [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(9)	(73)
Net amounts in consolidated balance sheet, assets	6	3
Fair value derivative liabilities, netting	(75)	(180)
Net amounts in consolidated balance sheet, liabilities	5	2
Credit Contracts Protection Purchased [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets, netting	(79)	(166)
Net amounts in consolidated balance sheet, assets	47	36
Fair value derivative liabilities, netting	(6)	(90)
Net amounts in consolidated balance sheet, liabilities	11	8
Designated as Hedging Instrument [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	3,099	2,810
Fair value derivative liabilities	2,530	2,012
Designated as Hedging Instrument [Member] \| Interest rate contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	186,206	177,511
Fair value derivative assets	2,559	2,237
Fair value derivative liabilities	1,368	636
Designated as Hedging Instrument [Member] \| Foreign exchange contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	33,439	34,176
Fair value derivative assets	540	573
Fair value derivative liabilities	1,162	1,376
Not designated as hedging instrument [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	36,951	31,750
Fair value derivative liabilities	35,586	30,035
Not designated as hedging instrument [Member] \| Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value derivative assets	2,155	2,463
Fair value derivative liabilities	1,033	528
Not designated as hedging instrument [Member] \| Economic hedges [Member] \| Interest rate contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	255,760	173,215
Fair value derivative assets	692	849
Fair value derivative liabilities	290	369
Not designated as hedging instrument [Member] \| Economic hedges [Member] \| Equity contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	17,374	13,920
Fair value derivative assets	1,213	1,362
Fair value derivative liabilities	658	79
Not designated as hedging instrument [Member] \| Economic hedges [Member] \| Foreign exchange contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	20,829	19,521
Fair value derivative assets	212	225
Fair value derivative liabilities	85	80
Not designated as hedging instrument [Member] \| Economic hedges [Member] \| Credit Contracts Protection Purchased [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	220	100
Fair value derivative assets	38	27
Fair value derivative liabilities	0	0
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	34,796	29,287
Fair value derivative liabilities	34,553	29,507
Not designated as hedging instrument [Member] \| Customer accommodation trading, and other derivatives [Member] \| Interest rate contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	11,130,569	9,162,821
Fair value derivative assets	22,302	15,349
Fair value derivative liabilities	18,979	15,303
Not designated as hedging instrument [Member] \| Customer accommodation trading, and other derivatives [Member] \| Commodity contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	72,255	66,173
Fair value derivative assets	1,424	1,588
Fair value derivative liabilities	1,936	2,336
Not designated as hedging instrument [Member] \| Customer accommodation trading, and other derivatives [Member] \| Equity contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	246,045	217,890
Fair value derivative assets	6,164	6,183
Fair value derivative liabilities	8,520	5,931
Not designated as hedging instrument [Member] \| Customer accommodation trading, and other derivatives [Member] \| Foreign exchange contract [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	353,918	364,982
Fair value derivative assets	4,803	5,916
Fair value derivative liabilities	5,021	5,657
Not designated as hedging instrument [Member] \| Customer accommodation trading, and other derivatives [Member] \| Credit Contracts Protection Sold [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	10,507	11,741
Fair value derivative assets	15	76
Fair value derivative liabilities	80	182
Not designated as hedging instrument [Member] \| Customer accommodation trading, and other derivatives [Member] \| Credit Contracts Protection Purchased [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	20,784	20,880
Fair value derivative assets	88	175
Fair value derivative liabilities	17	98
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	$ 10,000	$ 11,200

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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