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Variable Interest Entities and Securitizations - Carrying Amount of Assets and Liabilities of Variable Interest Entities (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Carrying Amount of Assets, Consolidated	$ 35,519	$ 35,556
Carrying Amount of Liabilities, Consolidated	18,201	19,019
Carrying Amount of Assets, Unconsolidated	5,127	4,802
Carrying Amount of Liabilities, Unconsolidated	1,289	1,377
Maximum Exposure to Loss	5,413	5,145
Affordable housing entities
Variable Interest Entity [Line Items]
Carrying Amount of Assets, Consolidated	236	243
Carrying Amount of Liabilities, Consolidated	7	17
Carrying Amount of Assets, Unconsolidated	4,559	4,238
Carrying Amount of Liabilities, Unconsolidated	1,289	1,303
Maximum Exposure to Loss	4,559	4,238
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	741	811
Entities that provide capital to low-income and rural communities
Variable Interest Entity [Line Items]
Carrying Amount of Assets, Consolidated	1,889	1,739
Carrying Amount of Liabilities, Consolidated	69	117
Carrying Amount of Assets, Unconsolidated	0	0
Carrying Amount of Liabilities, Unconsolidated	0	0
Maximum Exposure to Loss	0	0
Other
Variable Interest Entity [Line Items]
Carrying Amount of Assets, Consolidated	0	0
Carrying Amount of Liabilities, Consolidated	0	0
Carrying Amount of Assets, Unconsolidated	502	353
Carrying Amount of Liabilities, Unconsolidated	0	0
Maximum Exposure to Loss	502	353
Total other VIEs
Variable Interest Entity [Line Items]
Carrying Amount of Assets, Consolidated	2,125	1,982
Carrying Amount of Liabilities, Consolidated	76	134
Carrying Amount of Assets, Unconsolidated	5,061	4,591
Carrying Amount of Liabilities, Unconsolidated	1,289	1,303
Maximum Exposure to Loss	5,061	4,591
Credit card loan securitizations
Variable Interest Entity [Line Items]
Carrying Amount of Assets, Consolidated	31,112	33,574
Carrying Amount of Liabilities, Consolidated	16,113	18,885
Carrying Amount of Assets, Unconsolidated	0	0
Carrying Amount of Liabilities, Unconsolidated	0	0
Maximum Exposure to Loss	0	0
Auto loan securitizations
Variable Interest Entity [Line Items]
Carrying Amount of Assets, Consolidated	2,282
Carrying Amount of Liabilities, Consolidated	2,012
Carrying Amount of Assets, Unconsolidated	0
Carrying Amount of Liabilities, Unconsolidated	0
Maximum Exposure to Loss	0
Home loan
Variable Interest Entity [Line Items]
Carrying Amount of Assets, Consolidated	0	0
Carrying Amount of Liabilities, Consolidated	0	0
Carrying Amount of Assets, Unconsolidated	66	211
Carrying Amount of Liabilities, Unconsolidated	0	74
Maximum Exposure to Loss	352	554
Total securitization-related VIEs
Variable Interest Entity [Line Items]
Carrying Amount of Assets, Consolidated	33,394	33,574
Carrying Amount of Liabilities, Consolidated	18,125	18,885
Carrying Amount of Assets, Unconsolidated	66	211
Carrying Amount of Liabilities, Unconsolidated	0	74
Maximum Exposure to Loss	$ 352	$ 554

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.

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- 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.

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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
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- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
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- 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
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- Definition

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+ References

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- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
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- Definition

Carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph a
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