Loan Sale and Servicing Activities and Variable Interest Entities (Loan Sale and Servicing Activities and Variable Interest Entities) (Narrative) (Details) - USD ($) $ in Billions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Low Income Housing Tax Credit Investments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortization		$ 0.1
Low Income Housing Tax Credit And Market Tax Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortization	$ 0.1
Tax credits	0.1
Other tax benefits (Less than $0.1 billion for March 31, 2024)	$ 0.1

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible amortization.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-12

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+ References

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Amount of other income tax expense (benefit).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(1)(Note 1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-10

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-9

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