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Variable Interest Entities and Securitizations - Carrying Amount of Assets and Liabilities of Variable Interest Entities (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	$ 5,410	$ 5,413
Carrying Amount of Assets	396,878	390,365
Carrying Amount of Liabilities	340,048	332,354
Affordable housing entities
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	4,594	4,559
VIE, nonconsolidated, carrying amount of assets included in certain investment structures	2,300	2,300
VIE, nonconsolidated, carrying amount of liabilities included in certain investment structures	701	741
Entities that provide capital to low-income and rural communities
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	0	0
Other
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	486	502
Total other VIEs
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	5,080	5,061
Credit card loan securitizations
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	0	0
Auto loan securitizations
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	0	0
Home loan
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	330	352
Total securitization-related VIEs
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	330	352
Consolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	32,835	35,519
Carrying Amount of Liabilities	17,236	18,201
Consolidated | Affordable housing entities
Variable Interest Entity [Line Items]
Carrying Amount of Assets	246	236
Carrying Amount of Liabilities	18	7
Consolidated | Entities that provide capital to low-income and rural communities
Variable Interest Entity [Line Items]
Carrying Amount of Assets	1,967	1,889
Carrying Amount of Liabilities	69	69
Consolidated | Other
Variable Interest Entity [Line Items]
Carrying Amount of Assets	0	0
Carrying Amount of Liabilities	0	0
Consolidated | Total other VIEs
Variable Interest Entity [Line Items]
Carrying Amount of Assets	2,213	2,125
Carrying Amount of Liabilities	87	76
Consolidated | Credit card loan securitizations
Variable Interest Entity [Line Items]
Carrying Amount of Assets	27,271	31,112
Carrying Amount of Liabilities	14,180	16,113
Consolidated | Auto loan securitizations
Variable Interest Entity [Line Items]
Carrying Amount of Assets	3,351	2,282
Carrying Amount of Liabilities	2,969	2,012
Consolidated | Home loan
Variable Interest Entity [Line Items]
Carrying Amount of Assets	0	0
Carrying Amount of Liabilities	0	0
Consolidated | Total securitization-related VIEs
Variable Interest Entity [Line Items]
Carrying Amount of Assets	30,622	33,394
Carrying Amount of Liabilities	17,149	18,125
Unconsolidated
Variable Interest Entity [Line Items]
Carrying Amount of Assets	5,139	5,127
Carrying Amount of Liabilities	1,275	1,289
Unconsolidated | Affordable housing entities
Variable Interest Entity [Line Items]
Carrying Amount of Assets	4,594	4,559
Carrying Amount of Liabilities	1,275	1,289
Unconsolidated | Entities that provide capital to low-income and rural communities
Variable Interest Entity [Line Items]
Carrying Amount of Assets	0	0
Carrying Amount of Liabilities	0	0
Unconsolidated | Other
Variable Interest Entity [Line Items]
Carrying Amount of Assets	486	502
Carrying Amount of Liabilities	0	0
Unconsolidated | Total other VIEs
Variable Interest Entity [Line Items]
Carrying Amount of Assets	5,080	5,061
Carrying Amount of Liabilities	1,275	1,289
Unconsolidated | Credit card loan securitizations
Variable Interest Entity [Line Items]
Carrying Amount of Assets	0	0
Carrying Amount of Liabilities	0	0
Unconsolidated | Auto loan securitizations
Variable Interest Entity [Line Items]
Carrying Amount of Assets	0	0
Carrying Amount of Liabilities	0	0
Unconsolidated | Home loan
Variable Interest Entity [Line Items]
Carrying Amount of Assets	59	66
Carrying Amount of Liabilities	0	0
Unconsolidated | Total securitization-related VIEs
Variable Interest Entity [Line Items]
Carrying Amount of Assets	59	66
Carrying Amount of Liabilities	$ 0	$ 0

X

- Definition

In certain investment structures, we consolidate a VIE which in turn holds as its primary asset an investment in an unconsolidated VIE. This concept represents the carrying amount of assets related to these investment structures.

+ References

No definition available.

+ Details

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X

- Definition

In certain investment structures, we consolidate a VIE which in turn holds as its primary asset an investment in an unconsolidated VIE. This concept represents the carrying amount of liabilities related to these investment structures.

+ References

No definition available.

+ Details

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X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

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- Definition

Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19-26)
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X

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5747-111685

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5728-111685

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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