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Derivative Financial Instruments - Net Gains (Losses) Recorded in the Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used For Customer Accommodation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Interest rate contracts | Contract revenue | Income Statement Location [Axis]: fitb:CapitalMarketsFees |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net gains (losses) recorded in earnings | $ 15 | $ 7 | $ 25 | $ 15
Interest rate contracts | Credit portion of fair value adjustment | Income Statement Location [Axis]: us-gaap:OtherNoninterestExpense |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net gains (losses) recorded in earnings | 2 | (1) | 3 | (4)
Interest rate contracts | Interest rate lock commitments | Income Statement Location [Axis]: us-gaap:FeesAndCommissionsMortgageBankingAndServicing |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net gains (losses) recorded in earnings | 17 | 12 | 32 | 26
Commodity contracts | Contract revenue | Income Statement Location [Axis]: fitb:CapitalMarketsFees |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net gains (losses) recorded in earnings | 9 | 4 | 21 | 10
Commodity contracts | Credit portion of fair value adjustment | Income Statement Location [Axis]: us-gaap:OtherNoninterestExpense |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net gains (losses) recorded in earnings | 4 | 0 | (1) | 0
Foreign exchange contracts | Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net gains (losses) recorded in earnings | 12 | (6) | 22 | (5)
Foreign exchange contracts | Contract revenue | Income Statement Location [Axis]: us-gaap:OtherNoninterestExpense |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net gains (losses) recorded in earnings | 1 | (23) | 5 | (33)
Foreign exchange contracts | Contract revenue | Income Statement Location [Axis]: fitb:CapitalMarketsFees |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net gains (losses) recorded in earnings | $ 28 | $ 19 | $ 55 | $ 38

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