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, 2021		Jun. 30, 2021	Dec. 31, 2020		Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Assets
Other short-term Investments	[1]	$ 34,203			$ 33,399
ALLL		(1,954)	[1]	$ (2,033)	(2,453)	[1]	$ (2,574)	$ (2,696)	$ (1,202)
Other assets	[1]	11,889			10,749
Total Assets		207,731			204,680
Liabilities
Other liabilities	[1]	5,339			3,409
Long-term debt	[1]	11,419			14,973
Total Liabilities		185,207			181,569
Variable Interest Entity, Primary Beneficiary | Automobile loan
Assets
Other short-term Investments		27			55
Indirect secured consumer loans		383			756
ALLL		(3)			(7)
Other assets		2			5
Total Assets		409			809
Liabilities
Other liabilities		1			2
Long-term debt		325			656
Total Liabilities		$ 326			$ 658

[1] Includes $27 and $55 of other short-term investments, $383 and $756 of portfolio loans and leases, $(3) and $(7) of ALLL, $2 and $5 of other assets, $1 and $2 of other liabilities, and $325 and $656 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2021 and December 31, 2020, respectively. For further information, refer to Note 12.