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v3.25.1

Sales of Receivables and Servicing Rights - Additional Information (Details) - USD ($) $ in Billions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Transfers and Servicing [Abstract] |  |  |
Servicing Asset, Fair Value, Change in Fair Value, Other, Statement of Income or Comprehensive Income [Extensible Enumeration] | Fees and Commissions, Mortgage Banking and Servicing | Fees and Commissions, Mortgage Banking and Servicing |
Servicing of residential mortgage loans for other investors | $ 92.8 |  | $ 94.2
Weighted-average coupon of the MSR portfolio (as a percent) | 3.80% |  | 3.79%

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- Definition Loans serviced for others. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Mortgage-Backed Security, Weighted Average Coupon, Percentage + References No definition available. + Details
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Namespace Prefix: | fitb_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Indicates line item in statement of income or comprehensive income that includes increase (decrease) in fair value classified as other for contract to service financial asset under which benefit of servicing is expected to more than adequately compensate servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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