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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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