Variable Interest Entities - Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets (Details) - USD ($) $ in Millions		Sep. 30, 2025		Jun. 30, 2025	Dec. 31, 2024		Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Assets
Other short-term investments	[1]	$ 17,215			$ 17,120
ALLL		(2,265)	[1]	$ (2,412)	(2,352)	[1]	$ (2,305)	$ (2,288)	$ (2,322)
Other assets	[1]	12,176			12,857
Total Assets		212,903			212,927
Liabilities
Other liabilities	[1]	4,347			4,902
Long-term debt	[1]	13,677			14,337
Total Liabilities		191,796			193,282
Variable Interest Entity, Primary Beneficiary | Automobile And Solar Loan
Assets
Other short-term investments		42			51
Indirect secured consumer loans		620			967
Solar energy installation loans		29			33
ALLL		(11)			(19)
Other assets		4			5
Total Assets		684			1,037
Liabilities
Other liabilities		11			12
Long-term debt		563			889
Total Liabilities		$ 574			$ 901

[1] Includes $42 and $51 of other short-term investments, $649 and $1,000 of portfolio loans and leases, $(11) and $(19) of ALLL, $4 and $5 of other assets, $11 and $12 of other liabilities and $563 and $889 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2025 and December 31, 2024, respectively. For further information, refer to Note 7.