Variable Interest Entities - Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets (Details) - USD ($) $ in Millions		Mar. 31, 2021		Dec. 31, 2020		Mar. 31, 2020	Dec. 31, 2019
Assets
Other short-term Investments	[1]	$ 34,187		$ 33,399
ALLL		(2,208)	[1]	(2,453)	[1]	$ (2,348)	$ (1,202)
Other assets	[1]	10,858		10,749
Total Assets		206,899		204,680
Liabilities
Other liabilities	[1]	3,881		3,409
Long-term debt	[1]	14,743		14,973
Total Liabilities		184,304		181,569
Variable Interest Entity, Primary Beneficiary | Automobile loan
Assets
Other short-term Investments		54		55
Indirect secured consumer loans		633		756
ALLL		(5)		(7)
Other assets		4		5
Total Assets		686		809
Liabilities
Other liabilities		1		2
Long-term debt		540		656
Total Liabilities		$ 541		$ 658

[1] Includes $54 and $55 of other short-term investments, $633 and $756 of portfolio loans and leases, $(5) and $(7) of ALLL, $4 and $5 of other assets, $1 and $2 of other liabilities, and $540 and $656 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2021 and December 31, 2020, respectively. For further information, refer to Note 11.