Common, Preferred and Treasury Stock - Treasury Stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jul. 21, 2025
Accelerated Share Repurchases [Line Items]
Amount	$ 529	$ 630	$ 201
Forward contracts related to residential mortgage loans measured at fair value
Accelerated Share Repurchases [Line Items]
Notional Amount				$ 150
June 12, 2024 ASR
Accelerated Share Repurchases [Line Items]
Amount		$ 125
Shares Repurchased on Repurchase Date (in shares)		3,011,621
Shares Received from Forward Contract Settlement (in shares)		496,767
Total Share Repurchased (in shares)		3,508,388
July 23, 2024 ASR
Accelerated Share Repurchases [Line Items]
Amount		$ 200
Shares Repurchased on Repurchase Date (in shares)		4,160,548
Shares Received from Forward Contract Settlement (in shares)		713,340
Total Share Repurchased (in shares)		4,873,888
October 21, 2024 ASR
Accelerated Share Repurchases [Line Items]
Amount		$ 300
Shares Repurchased on Repurchase Date (in shares)		5,879,640
Shares Received from Forward Contract Settlement (in shares)		781,254
Total Share Repurchased (in shares)		6,660,894
January 23, 2025 ASR
Accelerated Share Repurchases [Line Items]
Amount	$ 225
Shares Repurchased on Repurchase Date (in shares)	4,353,517
Shares Received from Forward Contract Settlement (in shares)	888,865
Total Share Repurchased (in shares)	5,242,382
July 21, 2025 ASR
Accelerated Share Repurchases [Line Items]
Amount	$ 300
Shares Repurchased on Repurchase Date (in shares)	5,926,098
Shares Received from Forward Contract Settlement (in shares)	1,003,254
Total Share Repurchased (in shares)	6,929,352

FIFTH THIRD BANCORP 10-K