Leasing Activity, Leasing Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income and Expenses, Lessor [Abstract]
Interest income on lease financing	$ 223	$ 176	$ 439	$ 345
Variable revenue on lease financing	21	24	46	49
Fixed revenue on operating leases	229	245	468	494
Variable revenue on operating leases	13	13	22	24
Other lease-related revenue	29	25	177	87
Noninterest income on leases	292	307	713	654
Total leasing revenue	515	483	1,152	999
Leasing Activity Disclosures Textual [Abstract]
Lease expense	$ 159	$ 180	$ 323	$ 357

Amount of expense incurred and directly related to generating revenue by lessor from operating lease of rented property and equipment.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2)(c))
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

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- Definition

Amount of operating lease income from lease payments paid and payable to lessor. Excludes variable lease payments not included in measurement of lease receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482964/270-10-50-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-5

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- Definition

Amount of operating lease income from variable lease payments paid and payable to lessor, excluding amount included in measurement of lease receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482964/270-10-50-6A

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- Definition

Amount of interest income from net investment in sales-type and direct financing leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-5

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- Definition

Amount of variable lease payments from operating, direct financing, and sales-type leases, excluding amount included in measurement of lease receivable.

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Amount of direct financing lease income from variable lease payments; and operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, gains and losses from sale of lease assets and variable lease payments not included in measurement of lease receivable.

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Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, lease payments paid and payable to lessor, and gains and losses from sale of lease assets.

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Leasing Activity Disclosures Textual [Abstract]

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Other revenue related to assets under operating leases and lease financing, including net gain (loss) arising from the lessor's disposition of assets and impairment charges.

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