Equity Securities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Equity Securities [Line Items]
Equity securities, carried at fair value	$ 24,698	$ 39,098
Equity securities	59,560	72,886
Related to trading activities [Member]
Equity Securities [Line Items]
Equity securities, carried at fair value	23,111	27,476
Related to trading activities [Member] \| Marketable equity securities [Member]
Equity Securities [Line Items]
Equity securities, carried at fair value	14,791	27,476
Related to trading activities [Member] \| Nonmarketable equity securities [Member]
Equity Securities [Line Items]
Equity securities, carried at fair value	8,320	0
Not held for trading [Member]
Equity Securities [Line Items]
Equity securities, carried at fair value	1,587	11,622
Equity securities	36,449	45,410
Not held for trading [Member] \| Marketable equity securities [Member]
Equity Securities [Line Items]
Equity securities, carried at fair value	1,526	2,578
Not held for trading [Member] \| Nonmarketable equity securities [Member]
Equity Securities [Line Items]
Equity securities, carried at fair value	61	9,044
Not held for trading [Member] \| Equity method investments [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	8,353	8,196
Not held for trading [Member] \| Private equity [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	2,790	3,077
Not held for trading [Member] \| Tax-advantaged renewable energy [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	5,258	4,740
Not held for trading [Member] \| New market tax credit and other [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	305	379
Not held for trading [Member] \| Low-income housing tax credit investments [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	12,172	12,314
Not held for trading [Member] \| Other method investments - Private equity [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	10,036	9,694
Not held for trading [Member] \| Federal Reserve Bank stock and other at cost [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	$ 4,301	$ 3,584

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI) and investment in equity security without readily determinable fair value.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI https://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714

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- Definition

Line Items for Equity Securities

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