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, 2020		Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Assets
Other short-term Investments	[1]	$ 31,285				$ 1,950
ALLL		(2,574)	[1]	$ (2,696)	$ (33)	(1,202)	[1]	$ (1,143)	$ (1,115)	$ (1,103)
Other assets	[1]	10,828				9,190
Total Assets		201,996				169,369
Liabilities
Other liabilities	[1]	3,292				2,422
Long-term debt	[1]	15,123				14,970
Total Liabilities		179,045				148,166
Variable Interest Entity, Primary Beneficiary | Automobile loan
Assets
Other short-term Investments		61				74
Indirect secured consumer loans		887				1,354
ALLL		(9)				(7)
Other assets		5				8
Total Assets		944				1,429
Liabilities
Other liabilities		2				2
Long-term debt		786				1,253
Total Liabilities		$ 788				$ 1,255

[1] Includes $61 and $74 of other short-term investments, $887 and $1,354 of portfolio loans and leases, $(9) and $(7) of ALLL, $5 and $8 of other assets, $2 and $2 of other liabilities, and $786 and $1,253 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2020 and December 31, 2019, respectively. For further information refer to Note 13.